From 6723268c87de074b264022eac0e2dbad5db55d58 Mon Sep 17 00:00:00 2001
From: masclot <103062089+masclot@users.noreply.github.com>
Date: Tue, 9 Jan 2024 18:29:19 +0100
Subject: [PATCH] Fix #4135, Fix part of #5070: In FractionInteraction UI,
 leave submit button enabled when answer is empty. (#5224)

Fix part of https://github.com/oppia/oppia-android/issues/5070: In
FractionInteraction UI, leave submit button enabled when answer is
empty. Show an error on submitting an empty answer. The error message
already exists and is the same as in
https://github.com/oppia/oppia/pull/18379.

Demo video:
[leave_submit_button_enabled_on_empty_answer_v3.webm](https://github.com/oppia/oppia-android/assets/103062089/d072ae88-c462-455c-a324-57680d4a82c5)

The new error messages for empty inputs on submit are listed here:
[oppia/design-team#71(comment)](https://github.com/oppia/design-team/issues/71#issuecomment-1581232000)

I added an accessibility-label exemption for
FractionInputInteractionViewTestActivity as this activity is only used
in tests.

Fix #4135: incidentaly, this change also fixes #4135, since I had to
split the tests for FractionInputInteraction

## Essential Checklist
<!-- Please tick the relevant boxes by putting an "x" in them. -->
- [x] The PR title and explanation each start with "Fix #bugnum: " (If
this PR fixes part of an issue, prefix the title with "Fix part of
#bugnum: ...".)
- [x] Any changes to
[scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets)
files have their rationale included in the PR explanation.
- [x] The PR follows the [style
guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide).
- [x] The PR does not contain any unnecessary code changes from Android
Studio
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)).
- [x] The PR is made from a branch that's **not** called "develop" and
is up-to-date with "develop".
- [x] The PR is **assigned** to the appropriate reviewers
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)).

## For UI-specific PRs only
<!-- Delete these section if this PR does not include UI-related
changes. -->
If your PR includes UI-related changes, then:
- Add screenshots for portrait/landscape for both a tablet & phone of
the before & after UI changes
- For the screenshots above, include both English and pseudo-localized
(RTL) screenshots (see [RTL
guide](https://github.com/oppia/oppia-android/wiki/RTL-Guidelines))
- Add a video showing the full UX flow with a screen reader enabled (see
[accessibility
guide](https://github.com/oppia/oppia-android/wiki/Accessibility-A11y-Guide))
- For PRs introducing new UI elements or color changes, both light and
dark mode screenshots must be included
- Add a screenshot demonstrating that you ran affected Espresso tests
locally & that they're passing

---------

Co-authored-by: Adhiambo Peres <59600948+adhiamboperes@users.noreply.github.com>
---
 app/src/main/AndroidManifest.xml              |   1 +
 .../app/activity/ActivityComponentImpl.kt     |   2 +
 .../app/parser/FractionParsingUiError.kt      |   6 +-
 .../FractionInteractionViewModel.kt           |  29 +-
 .../MathExpressionInteractionsViewModel.kt    |   8 +-
 ...ractionInputInteractionViewTestActivity.kt | 112 ++++
 .../InputInteractionViewTestActivity.kt       |  13 +-
 ...y_fraction_input_interaction_view_test.xml |  75 +++
 .../activity_input_interaction_view_test.xml  |  41 --
 app/src/main/res/values/strings.xml           |   1 +
 .../app/player/state/StateFragmentTest.kt     |   7 +-
 ...ionInputInteractionViewTestActivityTest.kt | 608 ++++++++++++++++++
 .../InputInteractionViewTestActivityTest.kt   | 394 ------------
 .../app/parser/FractionParsingUiErrorTest.kt  |   2 +-
 .../accessibility_label_exemptions.textproto  |   1 +
 .../oppia/android/util/math/FractionParser.kt |   8 +-
 .../android/util/math/FractionParserTest.kt   |   4 +-
 17 files changed, 847 insertions(+), 465 deletions(-)
 create mode 100644 app/src/main/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivity.kt
 create mode 100644 app/src/main/res/layout/activity_fraction_input_interaction_view_test.xml
 create mode 100644 app/src/sharedTest/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivityTest.kt

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c324a1a7119..76102786288 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -213,6 +213,7 @@
     <activity android:name=".app.testing.DrawableBindingAdaptersTestActivity" />
     <activity android:name=".app.testing.ExplorationInjectionActivity" />
     <activity android:name=".app.testing.ExplorationTestActivity" />
+    <activity android:name=".app.testing.FractionInputInteractionViewTestActivity" />
     <activity
       android:name=".app.testing.TestFontScaleConfigurationUtilActivity"
       android:theme="@style/OppiaThemeWithoutActionBar" />
diff --git a/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt b/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
index 6641b39e76c..14645028aa5 100644
--- a/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
+++ b/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
@@ -64,6 +64,7 @@ import org.oppia.android.app.testing.DragDropTestActivity
 import org.oppia.android.app.testing.DrawableBindingAdaptersTestActivity
 import org.oppia.android.app.testing.ExplorationInjectionActivity
 import org.oppia.android.app.testing.ExplorationTestActivity
+import org.oppia.android.app.testing.FractionInputInteractionViewTestActivity
 import org.oppia.android.app.testing.HomeFragmentTestActivity
 import org.oppia.android.app.testing.HomeTestActivity
 import org.oppia.android.app.testing.HtmlParserTestActivity
@@ -139,6 +140,7 @@ interface ActivityComponentImpl :
   fun inject(faqSingleActivity: FAQSingleActivity)
   fun inject(forceNetworkTypeActivity: ForceNetworkTypeActivity)
   fun inject(forceNetworkTypeTestActivity: ForceNetworkTypeTestActivity)
+  fun inject(fractionInputInteractionViewTestActivity: FractionInputInteractionViewTestActivity)
   fun inject(helpActivity: HelpActivity)
   fun inject(homeActivity: HomeActivity)
   fun inject(homeFragmentTestActivity: HomeFragmentTestActivity)
diff --git a/app/src/main/java/org/oppia/android/app/parser/FractionParsingUiError.kt b/app/src/main/java/org/oppia/android/app/parser/FractionParsingUiError.kt
index 731d26e0590..81cd9e14035 100644
--- a/app/src/main/java/org/oppia/android/app/parser/FractionParsingUiError.kt
+++ b/app/src/main/java/org/oppia/android/app/parser/FractionParsingUiError.kt
@@ -20,7 +20,10 @@ enum class FractionParsingUiError(@StringRes private var error: Int?) {
   DIVISION_BY_ZERO(error = R.string.fraction_error_divide_by_zero),
 
   /** Corresponds to [FractionParsingError.NUMBER_TOO_LONG]. */
-  NUMBER_TOO_LONG(error = R.string.fraction_error_larger_than_seven_digits);
+  NUMBER_TOO_LONG(error = R.string.fraction_error_larger_than_seven_digits),
+
+  /** Corresponds to [FractionParsingError.EMPTY_INPUT]. */
+  EMPTY_INPUT(error = R.string.fraction_error_empty_input);
 
   /**
    * Returns the string corresponding to this error's string resources, or null if there is none.
@@ -39,6 +42,7 @@ enum class FractionParsingUiError(@StringRes private var error: Int?) {
         FractionParsingError.INVALID_FORMAT -> INVALID_FORMAT
         FractionParsingError.DIVISION_BY_ZERO -> DIVISION_BY_ZERO
         FractionParsingError.NUMBER_TOO_LONG -> NUMBER_TOO_LONG
+        FractionParsingError.EMPTY_INPUT -> EMPTY_INPUT
       }
     }
   }
diff --git a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/FractionInteractionViewModel.kt b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/FractionInteractionViewModel.kt
index 22d42a74744..193248effe7 100644
--- a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/FractionInteractionViewModel.kt
+++ b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/FractionInteractionViewModel.kt
@@ -43,12 +43,17 @@ class FractionInteractionViewModel private constructor(
         override fun onPropertyChanged(sender: Observable, propertyId: Int) {
           errorOrAvailabilityCheckReceiver.onPendingAnswerErrorOrAvailabilityCheck(
             pendingAnswerError,
-            answerText.isNotEmpty()
+            true // Allow submit on empty answer.
           )
         }
       }
     errorMessage.addOnPropertyChangedCallback(callback)
     isAnswerAvailable.addOnPropertyChangedCallback(callback)
+    // Force-update the UI to reflect the state of the errorMessage and isAnswerAvailable property:
+    errorOrAvailabilityCheckReceiver.onPendingAnswerErrorOrAvailabilityCheck(
+      /* pendingAnswerError= */null,
+      /* inputAnswerAvailable= */true
+    )
   }
 
   override fun getPendingAnswer(): UserAnswer = UserAnswer.newBuilder().apply {
@@ -64,23 +69,25 @@ class FractionInteractionViewModel private constructor(
 
   /** It checks the pending error for the current fraction input, and correspondingly updates the error string based on the specified error category. */
   override fun checkPendingAnswerError(category: AnswerErrorCategory): String? {
-    if (answerText.isNotEmpty()) {
-      when (category) {
-        AnswerErrorCategory.REAL_TIME -> {
+    when (category) {
+      AnswerErrorCategory.REAL_TIME -> {
+        if (answerText.isNotEmpty()) {
           pendingAnswerError =
             FractionParsingUiError.createFromParsingError(
               fractionParser.getRealTimeAnswerError(answerText.toString())
             ).getErrorMessageFromStringRes(resourceHandler)
+        } else {
+          pendingAnswerError = null
         }
-        AnswerErrorCategory.SUBMIT_TIME -> {
-          pendingAnswerError =
-            FractionParsingUiError.createFromParsingError(
-              fractionParser.getSubmitTimeError(answerText.toString())
-            ).getErrorMessageFromStringRes(resourceHandler)
-        }
       }
-      errorMessage.set(pendingAnswerError)
+      AnswerErrorCategory.SUBMIT_TIME -> {
+        pendingAnswerError =
+          FractionParsingUiError.createFromParsingError(
+            fractionParser.getSubmitTimeError(answerText.toString())
+          ).getErrorMessageFromStringRes(resourceHandler)
+      }
     }
+    errorMessage.set(pendingAnswerError)
     return pendingAnswerError
   }
 
diff --git a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/MathExpressionInteractionsViewModel.kt b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/MathExpressionInteractionsViewModel.kt
index 5d0822fae6c..132c988774b 100644
--- a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/MathExpressionInteractionsViewModel.kt
+++ b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/MathExpressionInteractionsViewModel.kt
@@ -73,6 +73,12 @@ class MathExpressionInteractionsViewModel private constructor(
    * bound to the corresponding edit text.
    */
   var answerText: CharSequence = ""
+    // The value of ths field is set from the Binding and from the TextWatcher. Any
+    // programmatic modification needs to be done here, so that the Binding and the TextWatcher
+    // do not step on each other.
+    set(value) {
+      field = value.toString().trim()
+    }
 
   /**
    * Defines whether an answer is currently available to parse. This is expected to be directly
@@ -166,7 +172,7 @@ class MathExpressionInteractionsViewModel private constructor(
       }
 
       override fun onTextChanged(answer: CharSequence, start: Int, before: Int, count: Int) {
-        answerText = answer.toString().trim()
+        answerText = answer
         val isAnswerTextAvailable = answerText.isNotEmpty()
         if (isAnswerTextAvailable != isAnswerAvailable.get()) {
           isAnswerAvailable.set(isAnswerTextAvailable)
diff --git a/app/src/main/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivity.kt b/app/src/main/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivity.kt
new file mode 100644
index 00000000000..bb812a550a9
--- /dev/null
+++ b/app/src/main/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivity.kt
@@ -0,0 +1,112 @@
+package org.oppia.android.app.testing
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import androidx.databinding.DataBindingUtil
+import org.oppia.android.R
+import org.oppia.android.app.activity.ActivityComponentImpl
+import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
+import org.oppia.android.app.customview.interaction.FractionInputInteractionView
+import org.oppia.android.app.model.InputInteractionViewTestActivityParams
+import org.oppia.android.app.model.Interaction
+import org.oppia.android.app.model.UserAnswer
+import org.oppia.android.app.model.WrittenTranslationContext
+import org.oppia.android.app.player.state.answerhandling.AnswerErrorCategory
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerErrorOrAvailabilityCheckReceiver
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerReceiver
+import org.oppia.android.app.player.state.itemviewmodel.FractionInteractionViewModel
+import org.oppia.android.app.player.state.itemviewmodel.StateItemViewModel
+import org.oppia.android.app.player.state.itemviewmodel.StateItemViewModel.InteractionItemFactory
+import org.oppia.android.app.player.state.listener.StateKeyboardButtonListener
+import org.oppia.android.databinding.ActivityFractionInputInteractionViewTestBinding
+import org.oppia.android.util.extensions.getProtoExtra
+import org.oppia.android.util.extensions.putProtoExtra
+import javax.inject.Inject
+
+/**
+ * This is a dummy activity to test [FractionInputInteractionView].
+ */
+class FractionInputInteractionViewTestActivity :
+  InjectableAutoLocalizedAppCompatActivity(),
+  StateKeyboardButtonListener,
+  InteractionAnswerErrorOrAvailabilityCheckReceiver,
+  InteractionAnswerReceiver {
+  private lateinit var binding: ActivityFractionInputInteractionViewTestBinding
+
+  @Inject
+  lateinit var fractionInteractionViewModelFactory: FractionInteractionViewModel.FactoryImpl
+
+  /** Gives access to the [FractionInteractionViewModel]. */
+  val fractionInteractionViewModel by lazy {
+    fractionInteractionViewModelFactory.create<FractionInteractionViewModel>()
+  }
+
+  /** Gives access to the translation context. */
+  lateinit var writtenTranslationContext: WrittenTranslationContext
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    (activityComponent as ActivityComponentImpl).inject(this)
+    binding = DataBindingUtil.setContentView<ActivityFractionInputInteractionViewTestBinding>(
+      this, R.layout.activity_fraction_input_interaction_view_test
+    )
+
+    val params =
+      intent.getProtoExtra(
+        TEST_ACTIVITY_PARAMS_ARGUMENT_KEY,
+        InputInteractionViewTestActivityParams.getDefaultInstance()
+      )
+    writtenTranslationContext = params.writtenTranslationContext
+    binding.fractionInteractionViewModel = fractionInteractionViewModel
+  }
+
+  /** Checks submit-time errors. */
+  fun getPendingAnswerErrorOnSubmitClick(v: View) {
+    fractionInteractionViewModel.checkPendingAnswerError(AnswerErrorCategory.SUBMIT_TIME)
+  }
+
+  override fun onPendingAnswerErrorOrAvailabilityCheck(
+    pendingAnswerError: String?,
+    inputAnswerAvailable: Boolean
+  ) {
+  }
+
+  override fun onAnswerReadyForSubmission(answer: UserAnswer) {
+  }
+
+  override fun onEditorAction(actionCode: Int) {
+  }
+
+  private inline fun <reified T : StateItemViewModel> InteractionItemFactory.create(
+    interaction: Interaction = Interaction.getDefaultInstance()
+  ): T {
+    return create(
+      entityId = "fake_entity_id",
+      hasConversationView = false,
+      interaction = interaction,
+      interactionAnswerReceiver = this@FractionInputInteractionViewTestActivity,
+      answerErrorReceiver = this@FractionInputInteractionViewTestActivity,
+      hasPreviousButton = false,
+      isSplitView = false,
+      writtenTranslationContext,
+      timeToStartNoticeAnimationMs = null
+    ) as T
+  }
+
+  companion object {
+    private const val TEST_ACTIVITY_PARAMS_ARGUMENT_KEY =
+      "FractionInputInteractionViewTestActivity.params"
+
+    /** Creates an intent to open this activity. */
+    fun createIntent(
+      context: Context,
+      extras: InputInteractionViewTestActivityParams
+    ): Intent {
+      return Intent(context, FractionInputInteractionViewTestActivity::class.java).also {
+        it.putProtoExtra(TEST_ACTIVITY_PARAMS_ARGUMENT_KEY, extras)
+      }
+    }
+  }
+}
diff --git a/app/src/main/java/org/oppia/android/app/testing/InputInteractionViewTestActivity.kt b/app/src/main/java/org/oppia/android/app/testing/InputInteractionViewTestActivity.kt
index 7190382efa0..ac786bb146a 100644
--- a/app/src/main/java/org/oppia/android/app/testing/InputInteractionViewTestActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/testing/InputInteractionViewTestActivity.kt
@@ -8,7 +8,6 @@ import androidx.databinding.DataBindingUtil
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
-import org.oppia.android.app.customview.interaction.FractionInputInteractionView
 import org.oppia.android.app.customview.interaction.NumericInputInteractionView
 import org.oppia.android.app.customview.interaction.TextInputInteractionView
 import org.oppia.android.app.model.InputInteractionViewTestActivityParams
@@ -24,7 +23,6 @@ import org.oppia.android.app.model.WrittenTranslationContext
 import org.oppia.android.app.player.state.answerhandling.AnswerErrorCategory
 import org.oppia.android.app.player.state.answerhandling.InteractionAnswerErrorOrAvailabilityCheckReceiver
 import org.oppia.android.app.player.state.answerhandling.InteractionAnswerReceiver
-import org.oppia.android.app.player.state.itemviewmodel.FractionInteractionViewModel
 import org.oppia.android.app.player.state.itemviewmodel.MathExpressionInteractionsViewModel
 import org.oppia.android.app.player.state.itemviewmodel.NumericInputViewModel
 import org.oppia.android.app.player.state.itemviewmodel.RatioExpressionInputInteractionViewModel
@@ -40,7 +38,7 @@ import org.oppia.android.app.player.state.itemviewmodel.MathExpressionInteractio
 
 /**
  * This is a dummy activity to test input interaction views.
- * It contains [FractionInputInteractionView], [NumericInputInteractionView],and [TextInputInteractionView].
+ * It contains [NumericInputInteractionView],and [TextInputInteractionView].
  */
 class InputInteractionViewTestActivity :
   InjectableAutoLocalizedAppCompatActivity(),
@@ -55,9 +53,6 @@ class InputInteractionViewTestActivity :
   @Inject
   lateinit var textInputViewModelFactory: TextInputViewModel.FactoryImpl
 
-  @Inject
-  lateinit var fractionInteractionViewModelFactory: FractionInteractionViewModel.FactoryImpl
-
   @Inject
   lateinit var ratioViewModelFactory: RatioExpressionInputInteractionViewModel.FactoryImpl
 
@@ -68,10 +63,6 @@ class InputInteractionViewTestActivity :
 
   val textInputViewModel by lazy { textInputViewModelFactory.create<TextInputViewModel>() }
 
-  val fractionInteractionViewModel by lazy {
-    fractionInteractionViewModelFactory.create<FractionInteractionViewModel>()
-  }
-
   val ratioExpressionInputInteractionViewModel by lazy {
     ratioViewModelFactory.create<RatioExpressionInputInteractionViewModel>(
       interaction = Interaction.newBuilder().putCustomizationArgs(
@@ -127,13 +118,11 @@ class InputInteractionViewTestActivity :
 
     binding.numericInputViewModel = numericInputViewModel
     binding.textInputViewModel = textInputViewModel
-    binding.fractionInteractionViewModel = fractionInteractionViewModel
     binding.ratioInteractionInputViewModel = ratioExpressionInputInteractionViewModel
     binding.mathExpressionInteractionsViewModel = mathExpressionViewModel
   }
 
   fun getPendingAnswerErrorOnSubmitClick(v: View) {
-    fractionInteractionViewModel.checkPendingAnswerError(AnswerErrorCategory.SUBMIT_TIME)
     numericInputViewModel.checkPendingAnswerError(AnswerErrorCategory.SUBMIT_TIME)
     ratioExpressionInputInteractionViewModel
       .checkPendingAnswerError(AnswerErrorCategory.SUBMIT_TIME)
diff --git a/app/src/main/res/layout/activity_fraction_input_interaction_view_test.xml b/app/src/main/res/layout/activity_fraction_input_interaction_view_test.xml
new file mode 100644
index 00000000000..ddd18d752d9
--- /dev/null
+++ b/app/src/main/res/layout/activity_fraction_input_interaction_view_test.xml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools">
+
+  <data>
+
+    <import type="android.view.View" />
+
+    <variable
+      name="fractionInteractionViewModel"
+      type="org.oppia.android.app.player.state.itemviewmodel.FractionInteractionViewModel" />
+  </data>
+
+  <ScrollView
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <LinearLayout
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:descendantFocusability="beforeDescendants"
+      android:focusableInTouchMode="true"
+      android:gravity="center"
+      android:orientation="vertical"
+      tools:context=".testing.FractionInputInteractionViewTestActivity">
+
+      <org.oppia.android.app.customview.interaction.FractionInputInteractionView
+        android:id="@+id/test_fraction_input_interaction_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:background="@drawable/edit_text_background"
+        android:fontFamily="sans-serif"
+        android:hint="@{fractionInteractionViewModel.hintText}"
+        android:imeOptions="actionDone"
+        android:longClickable="false"
+        android:maxLength="200"
+        android:minHeight="48dp"
+        android:paddingStart="16dp"
+        android:paddingEnd="16dp"
+        android:paddingBottom="8dp"
+        android:singleLine="true"
+        android:text="@={fractionInteractionViewModel.answerText}"
+        android:textColor="@color/component_color_shared_primary_text_color"
+        android:textColorHint="@color/component_color_shared_edit_text_hint_color"
+        android:textSize="14sp"
+        android:textStyle="italic"
+        app:textChangedListener="@{fractionInteractionViewModel.answerTextWatcher}" />
+
+      <TextView
+        android:id="@+id/fraction_input_error"
+        style="@style/TextViewStart"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="8dp"
+        android:fontFamily="sans-serif"
+        android:minHeight="32dp"
+        android:text="@{fractionInteractionViewModel.errorMessage}"
+        android:textColor="@color/component_color_shared_input_error_color"
+        android:textSize="12sp"
+        android:visibility="@{fractionInteractionViewModel.errorMessage.length() > 0 ? View.VISIBLE : View.INVISIBLE}" />
+
+      <Button
+        android:id="@+id/submit_button"
+        style="@style/StateButtonActive"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:onClick="getPendingAnswerErrorOnSubmitClick"
+        android:text="@string/submit_button_text"
+        android:textColor="@color/component_color_shared_secondary_4_text_color" />
+    </LinearLayout>
+  </ScrollView>
+</layout>
diff --git a/app/src/main/res/layout/activity_input_interaction_view_test.xml b/app/src/main/res/layout/activity_input_interaction_view_test.xml
index dba00bfb1e8..a8e798252c0 100644
--- a/app/src/main/res/layout/activity_input_interaction_view_test.xml
+++ b/app/src/main/res/layout/activity_input_interaction_view_test.xml
@@ -7,10 +7,6 @@
 
     <import type="android.view.View" />
 
-    <variable
-      name="fractionInteractionViewModel"
-      type="org.oppia.android.app.player.state.itemviewmodel.FractionInteractionViewModel" />
-
     <variable
       name="numericInputViewModel"
       type="org.oppia.android.app.player.state.itemviewmodel.NumericInputViewModel" />
@@ -40,43 +36,6 @@
       android:orientation="vertical"
       tools:context=".testing.InputInteractionViewTestActivity">
 
-      <org.oppia.android.app.customview.interaction.FractionInputInteractionView
-        android:id="@+id/test_fraction_input_interaction_view"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_margin="8dp"
-        android:background="@drawable/edit_text_background"
-        android:fontFamily="sans-serif"
-        android:hint="@{fractionInteractionViewModel.hintText}"
-        android:imeOptions="actionDone"
-        android:longClickable="false"
-        android:maxLength="200"
-        android:minHeight="48dp"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:paddingBottom="8dp"
-        android:singleLine="true"
-        android:text="@={fractionInteractionViewModel.answerText}"
-        android:textColor="@color/component_color_shared_primary_text_color"
-        android:textColorHint="@color/component_color_shared_edit_text_hint_color"
-        android:textSize="14sp"
-        android:textStyle="italic"
-        app:textChangedListener="@{fractionInteractionViewModel.answerTextWatcher}" />
-
-      <TextView
-        android:id="@+id/fraction_input_error"
-        style="@style/TextViewStart"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginStart="16dp"
-        android:layout_marginEnd="8dp"
-        android:fontFamily="sans-serif"
-        android:minHeight="32dp"
-        android:text="@{fractionInteractionViewModel.errorMessage}"
-        android:textColor="@color/component_color_shared_input_error_color"
-        android:textSize="12sp"
-        android:visibility="@{fractionInteractionViewModel.errorMessage.length() > 0 ? View.VISIBLE : View.INVISIBLE}" />
-
       <org.oppia.android.app.customview.interaction.RatioInputInteractionView
         android:id="@+id/test_ratio_input_interaction_view"
         android:layout_width="match_parent"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 62c2c4e08ce..31dd04601c1 100755
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -166,6 +166,7 @@
   <string name="fraction_error_invalid_format">Please enter a valid fraction (e.g., 5/3 or 1 2/3)</string>
   <string name="fraction_error_divide_by_zero">Please do not put 0 in the denominator</string>
   <string name="fraction_error_larger_than_seven_digits">None of the numbers in the fraction should have more than 7 digits.</string>
+  <string name="fraction_error_empty_input">Enter a fraction to continue.</string>
   <string name="number_error_starting_with_floating_point">Please begin your answer with a number (e.g.,”0” in 0.5).</string>
   <string name="number_error_invalid_format">Please enter a valid number.</string>
   <string name="number_error_larger_than_fifteen_characters">The answer can contain at most 15 digits (0–9) or symbols (. or -).</string>
diff --git a/app/src/sharedTest/java/org/oppia/android/app/player/state/StateFragmentTest.kt b/app/src/sharedTest/java/org/oppia/android/app/player/state/StateFragmentTest.kt
index 24ac673be8d..2888906d8fd 100644
--- a/app/src/sharedTest/java/org/oppia/android/app/player/state/StateFragmentTest.kt
+++ b/app/src/sharedTest/java/org/oppia/android/app/player/state/StateFragmentTest.kt
@@ -306,7 +306,7 @@ class StateFragmentTest {
 
       clickContinueInteractionButton()
 
-      verifySubmitAnswerButtonIsDisabled()
+      verifySubmitAnswerButtonIsEnabled()
       onView(withId(R.id.submit_answer_button)).check(
         matches(withText(R.string.state_submit_button))
       )
@@ -4702,6 +4702,11 @@ class StateFragmentTest {
     onView(withId(R.id.submit_answer_button)).check(matches(not(isEnabled())))
   }
 
+  private fun verifySubmitAnswerButtonIsEnabled() {
+    scrollToViewType(SUBMIT_ANSWER_BUTTON)
+    onView(withId(R.id.submit_answer_button)).check(matches(isEnabled()))
+  }
+
   private fun verifyViewTypeIsPresent(viewType: StateItemViewModel.ViewType) {
     // Attempting to scroll to the specified view type is sufficient to verify that it's present.
     scrollToViewType(viewType)
diff --git a/app/src/sharedTest/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivityTest.kt b/app/src/sharedTest/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivityTest.kt
new file mode 100644
index 00000000000..606f7b2f945
--- /dev/null
+++ b/app/src/sharedTest/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivityTest.kt
@@ -0,0 +1,608 @@
+package org.oppia.android.app.testing
+
+import android.app.Application
+import android.content.res.Configuration
+import androidx.appcompat.app.AppCompatActivity
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.closeSoftKeyboard
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import dagger.Component
+import org.junit.After
+import org.junit.Before
+import org.junit.Ignore
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.oppia.android.R
+import org.oppia.android.app.activity.ActivityComponent
+import org.oppia.android.app.activity.ActivityComponentFactory
+import org.oppia.android.app.activity.route.ActivityRouterModule
+import org.oppia.android.app.application.ApplicationComponent
+import org.oppia.android.app.application.ApplicationInjector
+import org.oppia.android.app.application.ApplicationInjectorProvider
+import org.oppia.android.app.application.ApplicationModule
+import org.oppia.android.app.application.ApplicationStartupListenerModule
+import org.oppia.android.app.application.testing.TestingBuildFlavorModule
+import org.oppia.android.app.devoptions.DeveloperOptionsModule
+import org.oppia.android.app.devoptions.DeveloperOptionsStarterModule
+import org.oppia.android.app.model.InteractionObject
+import org.oppia.android.app.player.state.itemviewmodel.SplitScreenInteractionModule
+import org.oppia.android.app.shim.ViewBindingShimModule
+import org.oppia.android.app.translation.testing.ActivityRecreatorTestModule
+import org.oppia.android.data.backends.gae.NetworkConfigProdModule
+import org.oppia.android.data.backends.gae.NetworkModule
+import org.oppia.android.domain.classify.InteractionsModule
+import org.oppia.android.domain.classify.rules.algebraicexpressioninput.AlgebraicExpressionInputModule
+import org.oppia.android.domain.classify.rules.continueinteraction.ContinueModule
+import org.oppia.android.domain.classify.rules.dragAndDropSortInput.DragDropSortInputModule
+import org.oppia.android.domain.classify.rules.fractioninput.FractionInputModule
+import org.oppia.android.domain.classify.rules.imageClickInput.ImageClickInputModule
+import org.oppia.android.domain.classify.rules.itemselectioninput.ItemSelectionInputModule
+import org.oppia.android.domain.classify.rules.mathequationinput.MathEquationInputModule
+import org.oppia.android.domain.classify.rules.multiplechoiceinput.MultipleChoiceInputModule
+import org.oppia.android.domain.classify.rules.numberwithunits.NumberWithUnitsRuleModule
+import org.oppia.android.domain.classify.rules.numericexpressioninput.NumericExpressionInputModule
+import org.oppia.android.domain.classify.rules.numericinput.NumericInputRuleModule
+import org.oppia.android.domain.classify.rules.ratioinput.RatioInputModule
+import org.oppia.android.domain.classify.rules.textinput.TextInputRuleModule
+import org.oppia.android.domain.exploration.ExplorationProgressModule
+import org.oppia.android.domain.exploration.ExplorationStorageModule
+import org.oppia.android.domain.hintsandsolution.HintsAndSolutionConfigModule
+import org.oppia.android.domain.hintsandsolution.HintsAndSolutionProdModule
+import org.oppia.android.domain.onboarding.ExpirationMetaDataRetrieverModule
+import org.oppia.android.domain.oppialogger.LogStorageModule
+import org.oppia.android.domain.oppialogger.LoggingIdentifierModule
+import org.oppia.android.domain.oppialogger.analytics.ApplicationLifecycleModule
+import org.oppia.android.domain.oppialogger.analytics.CpuPerformanceSnapshotterModule
+import org.oppia.android.domain.oppialogger.logscheduler.MetricLogSchedulerModule
+import org.oppia.android.domain.oppialogger.loguploader.LogReportWorkerModule
+import org.oppia.android.domain.platformparameter.PlatformParameterModule
+import org.oppia.android.domain.platformparameter.PlatformParameterSingletonModule
+import org.oppia.android.domain.question.QuestionModule
+import org.oppia.android.domain.topic.PrimeTopicAssetsControllerModule
+import org.oppia.android.domain.workmanager.WorkManagerConfigurationModule
+import org.oppia.android.testing.DisableAccessibilityChecks
+import org.oppia.android.testing.OppiaTestRule
+import org.oppia.android.testing.TestLogReportingModule
+import org.oppia.android.testing.espresso.EditTextInputAction
+import org.oppia.android.testing.junit.InitializeDefaultLocaleRule
+import org.oppia.android.testing.robolectric.RobolectricModule
+import org.oppia.android.testing.threading.TestCoroutineDispatchers
+import org.oppia.android.testing.threading.TestDispatcherModule
+import org.oppia.android.testing.time.FakeOppiaClockModule
+import org.oppia.android.util.accessibility.AccessibilityTestModule
+import org.oppia.android.util.caching.AssetModule
+import org.oppia.android.util.caching.testing.CachingTestModule
+import org.oppia.android.util.gcsresource.GcsResourceModule
+import org.oppia.android.util.locale.LocaleProdModule
+import org.oppia.android.util.logging.EventLoggingConfigurationModule
+import org.oppia.android.util.logging.LoggerModule
+import org.oppia.android.util.logging.SyncStatusModule
+import org.oppia.android.util.logging.firebase.FirebaseLogUploaderModule
+import org.oppia.android.util.networking.NetworkConnectionDebugUtilModule
+import org.oppia.android.util.networking.NetworkConnectionUtilDebugModule
+import org.oppia.android.util.parser.html.HtmlParserEntityTypeModule
+import org.oppia.android.util.parser.image.GlideImageLoaderModule
+import org.oppia.android.util.parser.image.ImageParsingModule
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.LooperMode
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/** Tests for [FractionInputInteractionViewTestActivity]. */
+@RunWith(AndroidJUnit4::class)
+@LooperMode(LooperMode.Mode.PAUSED)
+@Config(
+  application = FractionInputInteractionViewTestActivityTest.TestApplication::class,
+  qualifiers = "port-xxhdpi"
+)
+class FractionInputInteractionViewTestActivityTest {
+  @get:Rule
+  val initializeDefaultLocaleRule = InitializeDefaultLocaleRule()
+
+  @Inject
+  lateinit var testCoroutineDispatchers: TestCoroutineDispatchers
+
+  @get:Rule
+  val oppiaTestRule = OppiaTestRule()
+
+  @Inject
+  lateinit var editTextInputAction: EditTextInputAction
+
+  @Before
+  fun setUp() {
+    setUpTestApplicationComponent()
+    testCoroutineDispatchers.registerIdlingResource()
+  }
+
+  @After
+  fun tearDown() {
+    testCoroutineDispatchers.unregisterIdlingResource()
+  }
+
+  private fun setUpTestApplicationComponent() {
+    ApplicationProvider.getApplicationContext<TestApplication>().inject(this)
+  }
+
+  @Test
+  fun testFractionInput_withNoInput_hasCorrectPendingAnswerType() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(0)
+      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(0)
+      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(0)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withNegativeNumber_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(editTextInputAction.appendText("-9"))
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
+      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(9)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withWholeNumber_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(editTextInputAction.appendText("9"))
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
+      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(9)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withFraction_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "9/10"
+        )
+      )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
+      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
+      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withNegativeFraction_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "-9/10"
+        )
+      )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
+      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
+      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withMixedNumber_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "5 9/10"
+        )
+      )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
+      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(5)
+      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
+      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withNegativeMixedNumber_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "-55 59/9"
+        )
+      )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.FRACTION
+      )
+      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
+      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(55)
+      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(59)
+      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(9)
+    }
+  }
+
+  @Test
+  @Ignore("Landscape not properly supported") // TODO(#56): Reenable once landscape is supported.
+  fun testFractionInput_withFraction_configChange_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      FractionInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "9/5"
+        )
+      )
+    activityScenario.onActivity { activity ->
+      activity.requestedOrientation = Configuration.ORIENTATION_LANDSCAPE
+    }
+    onView(withId(R.id.test_fraction_input_interaction_view)).check(matches(isDisplayed()))
+      .check(matches(withText("9/5")))
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and will not be used by user
+  fun testFractionInput_withNegativeSignOtherThanAt0_numberFormatErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "55-"
+        )
+      )
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_invalid_format
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withNegativeSignAt0MoreThan1_numberFormatErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "--55"
+        )
+      )
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_invalid_format
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withDividerMoreThanOnce_numberFormatErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "5/5/"
+        )
+      )
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_invalid_format
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withDividerAtStart_numberFormatErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "/5"
+        )
+      )
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_invalid_format
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withPartialMixedNumber_numberFormatErrorIsNotDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "5 5/"
+        )
+      )
+    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withPartialMixedNumberSubmit_numberFormatErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "5 5/"
+        )
+      )
+    closeSoftKeyboard()
+    scrollToSubmitButton()
+    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_invalid_format
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withMixedNumber_submit_noErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "3 1/2"
+        )
+      )
+    closeSoftKeyboard()
+    scrollToSubmitButton()
+    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withDivideByZero_errorIsNotDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "1/0"
+        )
+      )
+    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withDivideByZero_submit_divideByZeroErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java)
+    onView(withId(R.id.test_fraction_input_interaction_view))
+      .perform(
+        editTextInputAction.appendText(
+          "1/0"
+        )
+      )
+    closeSoftKeyboard()
+    scrollToSubmitButton()
+    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+    onView(withId(R.id.fraction_input_error))
+      .check(
+        matches(
+          withText(
+            R.string.fraction_error_divide_by_zero
+          )
+        )
+      )
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withInvalidCharacter_invalidCharacterErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java).use {
+      onView(withId(R.id.test_fraction_input_interaction_view))
+        .perform(
+          editTextInputAction.appendText(
+            "."
+          )
+        )
+      onView(withId(R.id.fraction_input_error))
+        .check(
+          matches(
+            withText(
+              R.string.fraction_error_invalid_chars
+            )
+          )
+        )
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_withLong_submit_numberTooLongErrorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java).use {
+      onView(withId(R.id.test_fraction_input_interaction_view))
+        .perform(
+          editTextInputAction.appendText(
+            "12345678"
+          )
+        )
+      closeSoftKeyboard()
+      scrollToSubmitButton()
+      onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+      onView(withId(R.id.fraction_input_error))
+        .check(
+          matches(
+            withText(
+              R.string.fraction_error_larger_than_seven_digits
+            )
+          )
+        )
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as FractionInputInteractionViewTestActivity is a test file and
+  // will not be used by user
+  fun testFractionInput_emptyInput_submit_errorIsDisplayed() {
+    ActivityScenario.launch(FractionInputInteractionViewTestActivity::class.java).use {
+      testCoroutineDispatchers.runCurrent()
+      scrollToSubmitButton()
+      onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+      testCoroutineDispatchers.runCurrent()
+      onView(withId(R.id.fraction_input_error))
+        .check(
+          matches(
+            withText(
+              R.string.fraction_error_empty_input
+            )
+          )
+        )
+    }
+  }
+
+  private fun scrollToSubmitButton() {
+    onView(withId(R.id.submit_button)).perform(scrollTo())
+    testCoroutineDispatchers.runCurrent()
+  }
+
+  // TODO(#59): Figure out a way to reuse modules instead of needing to re-declare them.
+  @Singleton
+  @Component(
+    modules = [
+      RobolectricModule::class,
+      PlatformParameterModule::class, PlatformParameterSingletonModule::class,
+      TestDispatcherModule::class, ApplicationModule::class,
+      LoggerModule::class, ContinueModule::class, FractionInputModule::class,
+      ItemSelectionInputModule::class, MultipleChoiceInputModule::class,
+      NumberWithUnitsRuleModule::class, NumericInputRuleModule::class, TextInputRuleModule::class,
+      DragDropSortInputModule::class, ImageClickInputModule::class, InteractionsModule::class,
+      GcsResourceModule::class, GlideImageLoaderModule::class, ImageParsingModule::class,
+      HtmlParserEntityTypeModule::class, QuestionModule::class, TestLogReportingModule::class,
+      AccessibilityTestModule::class, LogStorageModule::class, CachingTestModule::class,
+      PrimeTopicAssetsControllerModule::class, ExpirationMetaDataRetrieverModule::class,
+      ViewBindingShimModule::class, RatioInputModule::class, WorkManagerConfigurationModule::class,
+      ApplicationStartupListenerModule::class, LogReportWorkerModule::class,
+      HintsAndSolutionConfigModule::class, HintsAndSolutionProdModule::class,
+      FirebaseLogUploaderModule::class, FakeOppiaClockModule::class,
+      DeveloperOptionsStarterModule::class, DeveloperOptionsModule::class,
+      ExplorationStorageModule::class, NetworkModule::class, NetworkConfigProdModule::class,
+      NetworkConnectionUtilDebugModule::class, NetworkConnectionDebugUtilModule::class,
+      AssetModule::class, LocaleProdModule::class, ActivityRecreatorTestModule::class,
+      NumericExpressionInputModule::class, AlgebraicExpressionInputModule::class,
+      MathEquationInputModule::class, SplitScreenInteractionModule::class,
+      LoggingIdentifierModule::class, ApplicationLifecycleModule::class,
+      SyncStatusModule::class, MetricLogSchedulerModule::class, TestingBuildFlavorModule::class,
+      EventLoggingConfigurationModule::class, ActivityRouterModule::class,
+      CpuPerformanceSnapshotterModule::class, ExplorationProgressModule::class
+    ]
+  )
+  interface TestApplicationComponent : ApplicationComponent {
+    @Component.Builder
+    interface Builder : ApplicationComponent.Builder
+
+    fun inject(inputInteractionViewTestActivityTest: FractionInputInteractionViewTestActivityTest)
+  }
+
+  class TestApplication : Application(), ActivityComponentFactory, ApplicationInjectorProvider {
+    private val component: TestApplicationComponent by lazy {
+      DaggerFractionInputInteractionViewTestActivityTest_TestApplicationComponent.builder()
+        .setApplication(this)
+        .build() as TestApplicationComponent
+    }
+
+    fun inject(inputInteractionViewTestActivityTest: FractionInputInteractionViewTestActivityTest) {
+      component.inject(inputInteractionViewTestActivityTest)
+    }
+
+    override fun createActivityComponent(activity: AppCompatActivity): ActivityComponent {
+      return component.getActivityComponentBuilderProvider().get().setActivity(activity).build()
+    }
+
+    override fun getApplicationInjector(): ApplicationInjector = component
+  }
+}
diff --git a/app/src/sharedTest/java/org/oppia/android/app/testing/InputInteractionViewTestActivityTest.kt b/app/src/sharedTest/java/org/oppia/android/app/testing/InputInteractionViewTestActivityTest.kt
index 8ed1123cc41..20692243b6c 100644
--- a/app/src/sharedTest/java/org/oppia/android/app/testing/InputInteractionViewTestActivityTest.kt
+++ b/app/src/sharedTest/java/org/oppia/android/app/testing/InputInteractionViewTestActivityTest.kt
@@ -140,400 +140,6 @@ class InputInteractionViewTestActivityTest {
     ApplicationProvider.getApplicationContext<TestApplication>().inject(this)
   }
 
-  // TODO(#4135): Move fraction input tests to a dedicated test suite.
-
-  @Test
-  fun testFractionInput_withNoInput_hasCorrectPendingAnswerType() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(0)
-      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(0)
-      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(0)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withNegativeNumber_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(editTextInputAction.appendText("-9"))
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
-      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(9)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withWholeNumber_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(editTextInputAction.appendText("9"))
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
-      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(9)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withFraction_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "9/10"
-        )
-      )
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
-      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
-      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withNegativeFraction_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "-9/10"
-        )
-      )
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
-      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
-      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withMixedNumber_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "5 9/10"
-        )
-      )
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(false)
-      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(5)
-      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(9)
-      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(10)
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withNegativeMixedNumber_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "-55 59/9"
-        )
-      )
-    activityScenario.onActivity { activity ->
-      val pendingAnswer = activity.fractionInteractionViewModel.getPendingAnswer()
-      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
-      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
-        InteractionObject.ObjectTypeCase.FRACTION
-      )
-      assertThat(pendingAnswer.answer.fraction.isNegative).isEqualTo(true)
-      assertThat(pendingAnswer.answer.fraction.wholeNumber).isEqualTo(55)
-      assertThat(pendingAnswer.answer.fraction.numerator).isEqualTo(59)
-      assertThat(pendingAnswer.answer.fraction.denominator).isEqualTo(9)
-    }
-  }
-
-  @Test
-  @Ignore("Landscape not properly supported") // TODO(#56): Reenable once landscape is supported.
-  fun testFractionInput_withFraction_configChange_hasCorrectPendingAnswer() {
-    val activityScenario = ActivityScenario.launch(
-      InputInteractionViewTestActivity::class.java
-    )
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "9/5"
-        )
-      )
-    activityScenario.onActivity { activity ->
-      activity.requestedOrientation = Configuration.ORIENTATION_LANDSCAPE
-    }
-    onView(withId(R.id.test_fraction_input_interaction_view)).check(matches(isDisplayed()))
-      .check(matches(withText("9/5")))
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and will not be used by user
-  fun testFractionInput_withNegativeSignOtherThanAt0_numberFormatErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "55-"
-        )
-      )
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_invalid_format
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withNegativeSignAt0MoreThan1_numberFormatErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "--55"
-        )
-      )
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_invalid_format
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withDividerMoreThanOnce_numberFormatErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "5/5/"
-        )
-      )
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_invalid_format
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withDividerAtStart_numberFormatErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "/5"
-        )
-      )
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_invalid_format
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withPartialMixedNumber_numberFormatErrorIsNotDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "5 5/"
-        )
-      )
-    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withPartialMixedNumberSubmit_numberFormatErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "5 5/"
-        )
-      )
-    closeSoftKeyboard()
-    scrollToSubmitButton()
-    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_invalid_format
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withMixedNumber_submit_noErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "3 1/2"
-        )
-      )
-    closeSoftKeyboard()
-    scrollToSubmitButton()
-    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
-    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withDivideByZero_errorIsNotDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "1/0"
-        )
-      )
-    onView(withId(R.id.fraction_input_error)).check(matches(withText("")))
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withDivideByZero_submit_divideByZeroErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java)
-    onView(withId(R.id.test_fraction_input_interaction_view))
-      .perform(
-        editTextInputAction.appendText(
-          "1/0"
-        )
-      )
-    closeSoftKeyboard()
-    scrollToSubmitButton()
-    onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
-    onView(withId(R.id.fraction_input_error))
-      .check(
-        matches(
-          withText(
-            R.string.fraction_error_divide_by_zero
-          )
-        )
-      )
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withInvalidCharacter_invalidCharacterErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java).use {
-      onView(withId(R.id.test_fraction_input_interaction_view))
-        .perform(
-          editTextInputAction.appendText(
-            "."
-          )
-        )
-      onView(withId(R.id.fraction_input_error))
-        .check(
-          matches(
-            withText(
-              R.string.fraction_error_invalid_chars
-            )
-          )
-        )
-    }
-  }
-
-  @Test
-  @DisableAccessibilityChecks // Disabled, as InputInteractionViewTestActivity is a test file and
-  // will not be used by user
-  fun testFractionInput_withLong_submit_numberTooLongErrorIsDisplayed() {
-    ActivityScenario.launch(InputInteractionViewTestActivity::class.java).use {
-      onView(withId(R.id.test_fraction_input_interaction_view))
-        .perform(
-          editTextInputAction.appendText(
-            "12345678"
-          )
-        )
-      closeSoftKeyboard()
-      scrollToSubmitButton()
-      onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
-      onView(withId(R.id.fraction_input_error))
-        .check(
-          matches(
-            withText(
-              R.string.fraction_error_larger_than_seven_digits
-            )
-          )
-        )
-    }
-  }
-
   @Test
   fun testNumericInput_withNoInput_hasCorrectPendingAnswerType() {
     val activityScenario = ActivityScenario.launch(
diff --git a/app/src/test/java/org/oppia/android/app/parser/FractionParsingUiErrorTest.kt b/app/src/test/java/org/oppia/android/app/parser/FractionParsingUiErrorTest.kt
index 6016d1d4894..58b622c0ede 100644
--- a/app/src/test/java/org/oppia/android/app/parser/FractionParsingUiErrorTest.kt
+++ b/app/src/test/java/org/oppia/android/app/parser/FractionParsingUiErrorTest.kt
@@ -165,7 +165,7 @@ class FractionParsingUiErrorTest {
         .toUiError()
         .getErrorMessageFromStringRes(activity.appLanguageResourceHandler)
       assertThat(errorMessage)
-        .isEqualTo("Please enter a valid fraction (e.g., 5/3 or 1 2/3)")
+        .isEqualTo("Enter a fraction to continue.")
     }
   }
 
diff --git a/scripts/assets/accessibility_label_exemptions.textproto b/scripts/assets/accessibility_label_exemptions.textproto
index 5e2c693ed1d..dd1db64c796 100644
--- a/scripts/assets/accessibility_label_exemptions.textproto
+++ b/scripts/assets/accessibility_label_exemptions.textproto
@@ -15,6 +15,7 @@ exempted_activity: "app/src/main/java/org/oppia/android/app/testing/DragDropTest
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/DrawableBindingAdaptersTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/ExplorationInjectionActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/ExplorationTestActivity"
+exempted_activity: "app/src/main/java/org/oppia/android/app/testing/FractionInputInteractionViewTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/HomeFragmentTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/HomeTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/HtmlParserTestActivity"
diff --git a/utility/src/main/java/org/oppia/android/util/math/FractionParser.kt b/utility/src/main/java/org/oppia/android/util/math/FractionParser.kt
index 7e2288cda95..354f354487d 100644
--- a/utility/src/main/java/org/oppia/android/util/math/FractionParser.kt
+++ b/utility/src/main/java/org/oppia/android/util/math/FractionParser.kt
@@ -24,6 +24,9 @@ class FractionParser {
    * detection should be done using [getRealTimeAnswerError], instead.
    */
   fun getSubmitTimeError(text: String): FractionParsingError {
+    if (text.isNullOrBlank()) {
+      return FractionParsingError.EMPTY_INPUT
+    }
     if (invalidCharsLengthRegex.find(text) != null) {
       return FractionParsingError.NUMBER_TOO_LONG
     }
@@ -130,6 +133,9 @@ class FractionParser {
      * Indicates that at least one of the numbers present in the string is too long to be
      * precisely represented in a fraction.
      */
-    NUMBER_TOO_LONG
+    NUMBER_TOO_LONG,
+
+    /** Indicates that the input text was empty. */
+    EMPTY_INPUT
   }
 }
diff --git a/utility/src/test/java/org/oppia/android/util/math/FractionParserTest.kt b/utility/src/test/java/org/oppia/android/util/math/FractionParserTest.kt
index 864a429f753..6079f7ec92c 100644
--- a/utility/src/test/java/org/oppia/android/util/math/FractionParserTest.kt
+++ b/utility/src/test/java/org/oppia/android/util/math/FractionParserTest.kt
@@ -85,9 +85,9 @@ class FractionParserTest {
   }
 
   @Test
-  fun testSubmitTimeError_emptyString_returnsInvalidFormat() {
+  fun testSubmitTimeError_emptyString_returnsEmptyInput() {
     val error = fractionParser.getSubmitTimeError("")
-    assertThat(error).isEqualTo(FractionParser.FractionParsingError.INVALID_FORMAT)
+    assertThat(error).isEqualTo(FractionParser.FractionParsingError.EMPTY_INPUT)
   }
 
   @Test