Fix #511 : Past expanded answers do not collapse in the question player

.github/workflows/main.yml

@@ -123,7 +123,7 @@ jobs:
       - name: Robolectric tests - FAQ, Help, Mydownloads, Parser, ProfileProgress, RecyclerView, Story, Utility tests
         # We require 'sudo' to avoid an error of the existing android sdk. See https://github.com/actions/starter-workflows/issues/58
         run: |
-          sudo ./gradlew :app:testDebugUnitTest --tests org.oppia.app.faq* --tests org.oppia.app.help* --tests org.oppia.app.mydownloads* --tests org.oppia.app.parser* --tests org.oppia.app.profileprogress* --tests org.oppia.app.recyclerview* --tests org.oppia.app.splash* --tests org.oppia.app.story* --tests org.oppia.app.utility*
+          sudo ./gradlew :app:testDebugUnitTest --tests org.oppia.app.faq* --tests org.oppia.app.help* --tests org.oppia.app.mydownloads* --tests org.oppia.app.parser* --tests org.oppia.app.profileprogress* --tests org.oppia.app.recyclerview* --tests org.oppia.app.splash* --tests org.oppia.app.story* --tests org.oppia.app.utility* --tests org.oppia.app.topic.questionplayer*
       - name: Upload App Test Reports
         uses: actions/upload-artifact@v2
         if: ${{ always() }} # IMPORTANT: Upload reports regardless of status

app/src/main/java/org/oppia/app/topic/questionplayer/QuestionPlayerViewModel.kt

@@ -1,13 +1,13 @@
 package org.oppia.app.topic.questionplayer
 
-import androidx.databinding.ObservableArrayList
 import androidx.databinding.ObservableBoolean
 import androidx.databinding.ObservableField
 import androidx.databinding.ObservableList
 import org.oppia.app.model.UserAnswer
 import org.oppia.app.player.state.answerhandling.AnswerErrorCategory
 import org.oppia.app.player.state.answerhandling.InteractionAnswerHandler
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel
+import org.oppia.app.viewmodel.ObservableArrayList
 import org.oppia.app.viewmodel.ObservableViewModel
 import javax.inject.Inject
 

app/src/main/res/layout-land/previous_responses_header_item.xml

@@ -10,6 +10,7 @@
   </data>
 
   <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/previous_response_header"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:clickable="true"

app/src/main/res/layout-sw600dp-land/previous_responses_header_item.xml

@@ -10,6 +10,7 @@
   </data>
 
   <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/previous_response_header"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:clickable="true"

app/src/main/res/layout-sw600dp-port/previous_responses_header_item.xml

@@ -10,6 +10,7 @@
   </data>
 
   <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/previous_response_header"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:clickable="true"

app/src/main/res/layout/previous_responses_header_item.xml

@@ -10,6 +10,7 @@
   </data>
 
   <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/previous_response_header"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:clickable="true"

app/src/test/java/org/oppia/app/player/state/StateFragmentLocalTest.kt

@@ -19,6 +19,7 @@ import androidx.test.espresso.assertion.ViewAssertions.matches
 import androidx.test.espresso.contrib.RecyclerViewActions.scrollToHolder
 import androidx.test.espresso.contrib.RecyclerViewActions.scrollToPosition
 import androidx.test.espresso.matcher.RootMatchers.isDialog
+import androidx.test.espresso.matcher.ViewMatchers.hasChildCount
 import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
 import androidx.test.espresso.matcher.ViewMatchers.isEnabled
 import androidx.test.espresso.matcher.ViewMatchers.withId
@@ -48,6 +49,7 @@ import org.oppia.app.player.exploration.TAG_HINTS_AND_SOLUTION_DIALOG
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel.ViewType.CONTINUE_NAVIGATION_BUTTON
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel.ViewType.FRACTION_INPUT_INTERACTION
+import org.oppia.app.player.state.itemviewmodel.StateItemViewModel.ViewType.PREVIOUS_RESPONSES_HEADER
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel.ViewType.SELECTION_INTERACTION
 import org.oppia.app.player.state.itemviewmodel.StateItemViewModel.ViewType.SUBMIT_ANSWER_BUTTON
 import org.oppia.app.player.state.testing.StateFragmentTestActivity
@@ -101,9 +103,15 @@ class StateFragmentLocalTest {
     createAudioUrl(explorationId = "MjZzEVOG47_1", audioFileName = "content-en-ouqm7j21vt8.mp3")
   private val audioDataSource1 = DataSource.toDataSource(AUDIO_URL_1, /* headers= */ null)
 
-  @Inject lateinit var profileTestHelper: ProfileTestHelper
-  @Inject lateinit var testCoroutineDispatchers: TestCoroutineDispatchers
-  @Inject @field:ApplicationContext lateinit var context: Context
+  @Inject
+  lateinit var profileTestHelper: ProfileTestHelper
+
+  @Inject
+  lateinit var testCoroutineDispatchers: TestCoroutineDispatchers
+
+  @Inject
+  @field:ApplicationContext
+  lateinit var context: Context
 
   private val internalProfileId: Int = 1
 
@@ -228,6 +236,65 @@ class StateFragmentLocalTest {
     }
   }
 
+  @Test
+  fun testStateFragment_submitTwoWrongAnswers_checkPreviousHeaderVisible() {
+    launchForExploration(FRACTIONS_EXPLORATION_ID_1).use {
+      startPlayingExploration()
+      playThroughState1()
+
+      submitTwoWrongAnswers()
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withId(R.id.previous_response_header)).check(matches(isDisplayed()))
+    }
+  }
+
+  @Test
+  fun testStateFragment_submitTwoWrongAnswers_checkPreviousHeaderCollapsed() {
+    launchForExploration(FRACTIONS_EXPLORATION_ID_1).use {
+      startPlayingExploration()
+      playThroughState1()
+
+      submitTwoWrongAnswers()
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withId(R.id.previous_response_header)).check(matches(isDisplayed()))
+      onView(withId(R.id.state_recycler_view)).check(matches(hasChildCount(/* childCount= */ 5)))
+    }
+  }
+
+  @Test
+  fun testStateFragment_submitTwoWrongAnswers_expandResponse_checkPreviousHeaderExpanded() {
+    launchForExploration(FRACTIONS_EXPLORATION_ID_1).use {
+      startPlayingExploration()
+      playThroughState1()
+
+      submitTwoWrongAnswers()
+
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withId(R.id.previous_response_header)).perform(click())
+      onView(withId(R.id.state_recycler_view)).check(matches(hasChildCount(/* childCount= */ 6)))
+    }
+  }
+
+  @Test
+  fun testStateFragment_expandCollapseResponse_checkPreviousHeaderCollapsed() {
+    launchForExploration(FRACTIONS_EXPLORATION_ID_1).use {
+      startPlayingExploration()
+      playThroughState1()
+
+      submitTwoWrongAnswers()
+
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withId(R.id.previous_response_header)).check(matches(isDisplayed()))
+      onView(withId(R.id.state_recycler_view)).check(matches(hasChildCount(/* childCount= */ 5)))
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withSubstring("Previous Responses")).perform(click())
+      onView(withId(R.id.state_recycler_view)).check(matches(hasChildCount(/* childCount= */ 6)))
+      onView(withId(R.id.state_recycler_view)).perform(scrollToViewType(PREVIOUS_RESPONSES_HEADER))
+      onView(withSubstring("Previous Responses")).perform(click())
+      onView(withId(R.id.state_recycler_view)).check(matches(hasChildCount(/* childCount= */ 5)))
+    }
+  }
+
   @Test
   fun testStateFragment_nextState_submitInitialWrongAnswer_noHintAvailable() {
     launchForExploration(FRACTIONS_EXPLORATION_ID_1).use {