Fix #3315: Set up UIAutomator with Bazel

.github/CODEOWNERS

@@ -196,6 +196,14 @@ NOTICE @BenHenning
 # Global model ownership.
 /model/ @vinitamurthi @BenHenning
 
+
+#####################################################################################
+#                                  instrumentation                                  #
+#####################################################################################
+
+# End-to-end test utilities and modules.
+/instrumentation/src/java/**/*.kt @anandwana001 @BenHenning
+
 #####################################################################################
 #                                global overrides                                   #
 #####################################################################################

BUILD.bazel

@@ -30,6 +30,7 @@ package_group(
         "//app/...",
         "//data/...",
         "//domain/...",
+        "//instrumentation/...",
         "//testing/...",
         "//utility/...",
     ],

WORKSPACE

@@ -141,6 +141,21 @@ http_archive(
 
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
+ATS_TAG = "1edfdab3134a7f01b37afabd3eebfd2c5bb05151"
+
+ATS_SHA256 = "dcd1ff76aef1a26329d77863972780c8fe1fc8ff625747342239f0489c2837ec"
+
+http_archive(
+    name = "android_test_support",
+    sha256 = ATS_SHA256,
+    strip_prefix = "android-test-%s" % ATS_TAG,
+    urls = ["https://github.com/android/android-test/archive/%s.tar.gz" % ATS_TAG],
+)
+
+load("@android_test_support//:repo.bzl", "android_test_repositories")
+
+android_test_repositories()
+
 # Note to developers: new dependencies should be added to //third_party:versions.bzl, not here.
 maven_install(
     artifacts = DAGGER_ARTIFACTS + get_maven_dependencies(),

instrumentation/BUILD.bazel

@@ -0,0 +1,30 @@
+"""
+This library contains all android_binary and android_instrumentation_test targets to each
+test suite in instrumentation module as a oppia_instrumentation_test wrapper.
+Note that:
+ - All the oppia_instrumentation_test targets are named similar to the respective class name
+ of the test suite.
+"""
+
+exports_files(["src/javatests/AndroidManifest.xml"])
+
+# Used for end-to-end tests
+android_binary(
+    name = "oppia_test",
+    testonly = True,
+    custom_package = "org.oppia.android",
+    enable_data_binding = True,
+    manifest = "//app:src/main/AndroidManifest.xml",
+    manifest_values = {
+        "applicationId": "org.oppia.android",
+        "minSdkVersion": "19",
+        "targetSdkVersion": "29",
+        "versionCode": "0",
+        "versionName": "0.1-test",
+    },
+    multidex = "native",
+    visibility = ["//:oppia_testing_visibility"],
+    deps = [
+        "//app",
+    ],
+)

instrumentation/oppia_instrumentation_test.bzl

@@ -0,0 +1,40 @@
+"""
+Instrumentation macros to define up end-to-end tests.
+"""
+
+load("@io_bazel_rules_kotlin//kotlin:kotlin.bzl", "kt_android_library")
+
+def oppia_instrumentation_test(
+        name,
+        srcs,
+        deps):
+    """
+    Creates library, binary, and instrumentation test for each test suite.
+
+    Args:
+        name: str. The class name of the test suite.
+        srcs: list of str. List of test files corresponding to this test suite.
+        deps: list of str. The list of dependencies needed to build and run the test.
+    """
+    kt_android_library(
+        name = "%s_lib" % name,
+        testonly = True,
+        srcs = srcs,
+        deps = deps,
+    )
+
+    native.android_binary(
+        name = "%sBinary" % name,
+        testonly = True,
+        custom_package = "org.oppia.android",
+        instruments = "//instrumentation:oppia_test",
+        manifest = "//instrumentation:src/javatests/AndroidManifest.xml",
+        deps = [":%s_lib" % name],
+    )
+
+    # TODO(#3617): Target isn't supported yet.
+    native.android_instrumentation_test(
+        name = name,
+        target_device = "@android_test_support//tools/android/emulated_devices/generic_phone:android_23_x86_qemu2",
+        test_app = ":%sBinary" % name,
+    )

instrumentation/src/java/org/oppia/android/instrumentation/testing/BUILD.bazel

@@ -0,0 +1,19 @@
+"""
+This library contains the utilities used in end-to-end testing.
+"""
+
+load("@io_bazel_rules_kotlin//kotlin:kotlin.bzl", "kt_android_library")
+
+kt_android_library(
+    name = "e2e_test_helper",
+    testonly = True,
+    srcs = [
+        "EndToEndTestHelper.kt",
+    ],
+    visibility = ["//:oppia_testing_visibility"],
+    deps = [
+        "//third_party:androidx_test_ext_junit",
+        "//third_party:androidx_test_uiautomator_uiautomator",
+        "//third_party:com_google_truth_truth",
+    ],
+)

instrumentation/src/java/org/oppia/android/instrumentation/testing/EndToEndTestHelper.kt

@@ -0,0 +1,74 @@
+package org.oppia.android.instrumentation.testing
+
+import android.content.Context
+import android.content.Intent
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.UiDevice
+import androidx.test.uiautomator.UiObject2
+import androidx.test.uiautomator.UiScrollable
+import androidx.test.uiautomator.UiSelector
+import androidx.test.uiautomator.Until
+import com.google.common.truth.Truth.assertThat
+
+/** This object contains common operations used for end-to-end tests. */
+object EndToEndTestHelper {
+
+  private val OPPIA_PACKAGE = "org.oppia.android"
+  private val LAUNCH_TIMEOUT_SECONDS = 30000L
+  private val TRANSITION_TIMEOUT_SECONDS = 5000L
+
+  /** Starts Oppia from the home screen. */
+  fun UiDevice.startOppiaFromScratch() {
+    // Start from the home screen
+    pressHome()
+
+    // Wait for launcher
+    val launcherPackage = launcherPackageName
+    assertThat(launcherPackage).isNotNull()
+    wait(Until.hasObject(By.pkg(launcherPackage).depth(1)), LAUNCH_TIMEOUT_SECONDS)
+
+    // Launch the blueprint app
+    val context = ApplicationProvider.getApplicationContext<Context>()
+    val intent = context.packageManager
+      .getLaunchIntentForPackage(OPPIA_PACKAGE)
+    intent!!.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK) // Clear out any previous instances
+    context.startActivity(intent)
+
+    // Wait for the app to appear
+    wait(Until.hasObject(By.pkg(OPPIA_PACKAGE)), LAUNCH_TIMEOUT_SECONDS)
+  }
+
+  /** Waits for the view with given resourceId to appear. */
+  fun UiDevice.waitForRes(resourceId: String, timeout: Long = TRANSITION_TIMEOUT_SECONDS) {
+    wait(Until.hasObject(By.res(resourceId)), timeout)
+  }
+
+  /** Waits for the view with given text to appear. */
+  fun UiDevice.waitForText(text: String) {
+    wait(Until.hasObject(By.text(text)), TRANSITION_TIMEOUT_SECONDS)
+  }
+
+  /** Return the UiObject with the given text. */
+  fun UiDevice.findObjectByText(text: String): UiObject2? {
+    waitForText(text)
+    return findObject(By.text(text))
+  }
+
+  /** Returns the UiObject for the given resourceId. */
+  fun UiDevice.findObjectByRes(resourceId: String): UiObject2? {
+    waitForRes(resourceId)
+    return findObject(By.res("$OPPIA_PACKAGE:id/$resourceId"))
+  }
+
+  /** Performs a scroll until the view with the give text is visible. */
+  fun scrollRecyclerViewTextIntoView(text: String, isVertical: Boolean = true) {
+    val recyclerView = UiScrollable(UiSelector().scrollable(true))
+    if (isVertical) {
+      recyclerView.setAsVerticalList()
+    } else {
+      recyclerView.setAsHorizontalList()
+    }
+    recyclerView.scrollTextIntoView(text)
+  }
+}

instrumentation/src/javatests/AndroidManifest.xml

@@ -0,0 +1,11 @@
+<?xmxl version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="org.oppia.android.app.instrumentation">
+  <uses-sdk
+    android:minSdkVersion="19"
+    android:targetSdkVersion="29" />
+  <instrumentation
+    android:targetPackage="org.oppia.android"
+    android:name="androidx.test.runner.AndroidJUnitRunner" />
+  <application android:label="OppiaTest" />
+</manifest>

instrumentation/src/javatests/org/oppia/android/instrumentation/player/BUILD.bazel

@@ -0,0 +1,20 @@
+"""
+This library contains the test suite source files of the player package.
+"""
+
+load("//instrumentation:oppia_instrumentation_test.bzl", "oppia_instrumentation_test")
+
+oppia_instrumentation_test(
+    name = "ExplorationPlayerTest",
+    srcs = [
+        "ExplorationPlayerTest.kt",
+    ],
+    deps = [
+        "//instrumentation/src/java/org/oppia/android/instrumentation/testing:e2e_test_helper",
+        "//third_party:androidx_test_ext_junit",
+        "//third_party:androidx_test_runner",
+        "//third_party:androidx_test_uiautomator_uiautomator",
+        "//third_party:com_google_truth_truth",
+        "//third_party:junit_junit",
+    ],
+)

instrumentation/src/javatests/org/oppia/android/instrumentation/player/ExplorationPlayerTest.kt

@@ -0,0 +1,44 @@
+package org.oppia.android.instrumentation.player
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.uiautomator.UiDevice
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.oppia.android.instrumentation.testing.EndToEndTestHelper.findObjectByRes
+import org.oppia.android.instrumentation.testing.EndToEndTestHelper.findObjectByText
+import org.oppia.android.instrumentation.testing.EndToEndTestHelper.scrollRecyclerViewTextIntoView
+import org.oppia.android.instrumentation.testing.EndToEndTestHelper.startOppiaFromScratch
+import org.oppia.android.instrumentation.testing.EndToEndTestHelper.waitForRes
+
+/** Tests for Explorations. */
+class ExplorationPlayerTest {
+  private lateinit var device: UiDevice
+
+  @Before
+  fun setUp() {
+    // Initialize UiDevice instance
+    device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
+    device.startOppiaFromScratch()
+  }
+
+  @Test
+  fun testExploration_prototypeExploration_toolbarTitle_isDisplayedSuccessfully() {
+    navigateToPrototypeExploration()
+    assertThat(device.findObjectByRes("exploration_toolbar_title")).isNotNull()
+  }
+
+  /** Navigates and opens the Prototype Exploration using the admin profile. */
+  private fun navigateToPrototypeExploration() {
+    device.findObjectByRes("skip_text_view")?.click()
+    device.findObjectByRes("get_started_button")?.click()
+    device.waitForRes("profile_select_text")
+    device.findObjectByText("Admin")?.click()
+    scrollRecyclerViewTextIntoView("First Test Topic")
+    device.findObjectByText("First Test Topic")?.click()
+    device.findObjectByText("LESSONS")?.click()
+    device.findObjectByText("First Story")?.click()
+    scrollRecyclerViewTextIntoView("Chapter 1: Prototype Exploration")
+    device.findObjectByText("Chapter 1: Prototype Exploration")?.click()
+  }
+}

scripts/assets/test_file_exemptions.textproto

@@ -574,6 +574,7 @@ exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/FloatExt
 exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/FractionExtensions.kt"
 exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/JsonAssetRetriever.kt"
 exempted_file_path: "domain/src/test/java/org/oppia/android/domain/classify/InteractionObjectTestBuilder.kt"
+exempted_file_path: "instrumentation/src/java/org/oppia/android/instrumentation/testing/EndToEndTestHelper.kt"
 exempted_file_path: "scripts/src/java/org/oppia/android/scripts/common/CommandExecutor.kt"
 exempted_file_path: "scripts/src/java/org/oppia/android/scripts/common/CommandResult.kt"
 exempted_file_path: "scripts/src/java/org/oppia/android/scripts/license/LicenseFetcher.kt"

scripts/buildifier_lint_check.sh

@@ -14,7 +14,7 @@ else
     buildifier_file_path="$github_actions_path/oppia-android-tools/buildifier"
 fi
 
-$buildifier_file_path --lint=warn --mode=check --warnings=-native-android,+out-of-order-load,+unsorted-dict-items -r app data domain model testing utility third_party tools scripts BUILD.bazel WORKSPACE oppia_android_test.bzl
+$buildifier_file_path --lint=warn --mode=check --warnings=-native-android,+out-of-order-load,+unsorted-dict-items -r app data domain instrumentation model testing utility third_party tools scripts BUILD.bazel WORKSPACE oppia_android_test.bzl
 
 status=$?
 

scripts/ktlint_lint_check.sh

@@ -14,7 +14,7 @@ else
     jar_file_path="$github_actions_path/oppia-android-tools/ktlint"
 fi
 
-java -jar $jar_file_path --android app/src/**/*.kt data/src/**/*.kt domain/src/**/*.kt testing/src/**/*.kt utility/src/**/*.kt scripts/src/**/*.kt
+java -jar $jar_file_path --android app/src/**/*.kt data/src/**/*.kt domain/src/**/*.kt testing/src/**/*.kt utility/src/**/*.kt scripts/src/**/*.kt instrumentation/src/**/*.kt
 
 status=$?
 
@@ -25,7 +25,7 @@ else
   echo "********************************"
   echo "Ktlint issue found."
   echo "Please fix the above issues.
-  You can also use the java -jar $jar_file_path -F --android domain/src/**/*.kt utility/src/**/*.kt data/src/**/*.kt app/src/**/*.kt testing/src/**/*.kt scripts/src/**/*.kt
+  You can also use the java -jar $jar_file_path -F --android domain/src/**/*.kt utility/src/**/*.kt data/src/**/*.kt app/src/**/*.kt testing/src/**/*.kt scripts/src/**/*.kt  instrumentation/src/**/*.kt
   command to fix the most common issues."
   echo "Please note, there might be a possibility where the above command will not fix the issue.
   In that case, you will have to fix it yourself."

scripts/src/java/org/oppia/android/scripts/ci/ComputeAffectedTests.kt

@@ -63,11 +63,23 @@ private fun computeAffectedTargetsForDevelopBranch(bazelClient: BazelClient, out
 
   val allTestTargets = bazelClient.retrieveAllTestTargets()
   println()
+
+  // Filtering out the targets to be ignored.
+  val nonInstrumentationAffectedTestTargets = allTestTargets.filter { targetPath ->
+    !targetPath
+      .startsWith(
+        "//instrumentation/src/javatests/org/oppia/android/instrumentation/player",
+        ignoreCase = true
+      )
+  }
+
   println(
     "Affected test targets:" +
-      "\n${allTestTargets.joinToString(separator = "\n") { "- $it" }}"
+      "\n${nonInstrumentationAffectedTestTargets.joinToString(separator = "\n") { "- $it" }}"
   )
-  outputFile.printWriter().use { writer -> allTestTargets.forEach { writer.println(it) } }
+  outputFile.printWriter().use { writer ->
+    nonInstrumentationAffectedTestTargets.forEach { writer.println(it) }
+  }
 }
 
 private fun computeAffectedTargetsForNonDevelopBranch(
@@ -103,10 +115,22 @@ private fun computeAffectedTargetsForNonDevelopBranch(
   println("Affected test targets due to transitive build deps: $transitiveTestTargets")
 
   val allAffectedTestTargets = (affectedTestTargets + transitiveTestTargets).toSet()
+
+  // Filtering out the targets to be ignored.
+  val nonInstrumentationAffectedTestTargets = allAffectedTestTargets.filter { targetPath ->
+    !targetPath
+      .startsWith(
+        "//instrumentation/src/javatests/org/oppia/android/instrumentation/player",
+        ignoreCase = true
+      )
+  }
+
   println()
   println(
     "Affected test targets:" +
-      "\n${allAffectedTestTargets.joinToString(separator = "\n") { "- $it" }}"
+      "\n${nonInstrumentationAffectedTestTargets.joinToString(separator = "\n") { "- $it" }}"
   )
-  outputFile.printWriter().use { writer -> allAffectedTestTargets.forEach { writer.println(it) } }
+  outputFile.printWriter().use { writer ->
+    nonInstrumentationAffectedTestTargets.forEach { writer.println(it) }
+  }
 }