Improved test cases and fixed memory leak in application.

* Previously our test cases were launching the `KiwixMainActivity` twice (firstly it sets the values in preference and then relaunch the activity) before running the test case which was the cause of slow testing and sometimes it caused to memory leak in some api levels so we have refactored our test cases to launch `KiwixMainTest` once per test case.
* `IntroFragmentTest` is failing on api level 24 due to a memory leak because after clicking on getStarted button is going to the LocalLibrary page but somehow `onStart` and `onStop` methods are calling of the `CoreReaderFragment` which stablish the `serviceConnection` but it was happening very quickly so before attaching the binder to `readAloudService` unbindService method called but at this point service was not created but creating was in progress so after going to library screen it allocate memory to `readAloudService` but `ReaderFragment` is no more visible to the user that's why memory leak happened. We have fixed it by unbinding the service in `onDestroyView` method.

app/src/androidTest/java/org/kiwix/kiwixmobile/BaseActivityTest.kt

@@ -21,7 +21,7 @@ package org.kiwix.kiwixmobile
 import android.Manifest.permission
 import android.content.Context
 import android.os.Build
-import androidx.test.ext.junit.rules.ActivityScenarioRule
+import androidx.test.core.app.ActivityScenario
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import androidx.test.platform.app.InstrumentationRegistry.getInstrumentation
 import androidx.test.rule.GrantPermissionRule
@@ -33,8 +33,7 @@ import org.kiwix.kiwixmobile.main.KiwixMainActivity
 
 @RunWith(AndroidJUnit4::class)
 abstract class BaseActivityTest {
-  @get:Rule
-  open var activityScenarioRule = ActivityScenarioRule(KiwixMainActivity::class.java)
+  open lateinit var activityScenario: ActivityScenario<KiwixMainActivity>
 
   private val permissions = if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
     arrayOf(

app/src/androidTest/java/org/kiwix/kiwixmobile/download/DownloadTest.kt

@@ -19,6 +19,7 @@ package org.kiwix.kiwixmobile.download
 
 import android.util.Log
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.espresso.IdlingPolicies
@@ -73,11 +74,13 @@ class DownloadTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.IS_PLAY_STORE_BUILD, true)
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun downloadTest() {
-    ActivityScenario.launch(KiwixMainActivity::class.java)
     BaristaSleepInteractions.sleep(TestUtils.TEST_PAUSE_MS.toLong())
     try {
       downloadRobot {

app/src/androidTest/java/org/kiwix/kiwixmobile/help/HelpFragmentTest.kt

@@ -17,6 +17,8 @@
  */
 package org.kiwix.kiwixmobile.help
 
+import androidx.lifecycle.Lifecycle
+import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
 import leakcanary.LeakAssertions
@@ -25,6 +27,7 @@ import org.junit.Rule
 import org.junit.Test
 import org.kiwix.kiwixmobile.BaseActivityTest
 import org.kiwix.kiwixmobile.R
+import org.kiwix.kiwixmobile.main.KiwixMainActivity
 import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
 import org.kiwix.kiwixmobile.testutils.TestUtils.isSystemUINotRespondingDialogVisible
@@ -39,6 +42,9 @@ class HelpFragmentTest : BaseActivityTest() {
       }
       waitForIdle()
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Rule
@@ -47,7 +53,7 @@ class HelpFragmentTest : BaseActivityTest() {
 
   @Test
   fun verifyHelpActivity() {
-    activityScenarioRule.scenario.onActivity {
+    activityScenario.onActivity {
       it.navigate(R.id.helpFragment)
     }
     help {

app/src/androidTest/java/org/kiwix/kiwixmobile/initial/download/InitialDownloadTest.kt

@@ -19,6 +19,7 @@
 package org.kiwix.kiwixmobile.initial.download
 
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.ext.junit.runners.AndroidJUnit4
@@ -63,11 +64,13 @@ class InitialDownloadTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.IS_PLAY_STORE_BUILD, true)
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun initialDownloadTest() {
-    ActivityScenario.launch(KiwixMainActivity::class.java)
     BaristaSleepInteractions.sleep(TestUtils.TEST_PAUSE_MS_FOR_SEARCH_TEST.toLong())
     initialDownload {
       clickLibraryOnBottomNav()

app/src/androidTest/java/org/kiwix/kiwixmobile/intro/IntroFragmentTest.kt

@@ -18,7 +18,9 @@
 package org.kiwix.kiwixmobile.intro
 
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
+import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
 import leakcanary.LeakAssertions
@@ -28,6 +30,7 @@ import org.junit.Test
 import org.kiwix.kiwixmobile.BaseActivityTest
 import org.kiwix.kiwixmobile.R
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
+import org.kiwix.kiwixmobile.main.KiwixMainActivity
 import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
 import org.kiwix.kiwixmobile.testutils.TestUtils.isSystemUINotRespondingDialogVisible
@@ -40,7 +43,7 @@ class IntroFragmentTest : BaseActivityTest() {
 
   @Test
   fun viewIsSwipeableAndNavigatesToMain() {
-    activityScenarioRule.scenario.onActivity {
+    activityScenario.onActivity {
       it.navigate(R.id.introFragment)
     }
     intro(IntroRobot::swipeLeft) clickGetStarted {}
@@ -58,5 +61,8 @@ class IntroFragmentTest : BaseActivityTest() {
     PreferenceManager.getDefaultSharedPreferences(context).edit {
       putBoolean(SharedPreferenceUtil.PREF_SHOW_INTRO, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 }

app/src/androidTest/java/org/kiwix/kiwixmobile/main/TopLevelDestinationTest.kt

@@ -18,6 +18,7 @@
 package org.kiwix.kiwixmobile.main
 
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
@@ -59,11 +60,13 @@ class TopLevelDestinationTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
       putBoolean(SharedPreferenceUtil.PREF_EXTERNAL_LINK_POPUP, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun testTopLevelDestination() {
-    ActivityScenario.launch(KiwixMainActivity::class.java)
     topLevel {
       clickReaderOnBottomNav {
       }

app/src/androidTest/java/org/kiwix/kiwixmobile/mimetype/MimeTypeTest.kt

@@ -19,7 +19,9 @@
 package org.kiwix.kiwixmobile.mimetype
 
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
+import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
 import org.junit.Assert
@@ -30,6 +32,7 @@ import org.kiwix.kiwixmobile.BaseActivityTest
 import org.kiwix.kiwixmobile.core.NightModeConfig
 import org.kiwix.kiwixmobile.core.reader.ZimFileReader
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
+import org.kiwix.kiwixmobile.main.KiwixMainActivity
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
 import org.kiwix.kiwixmobile.testutils.TestUtils.isSystemUINotRespondingDialogVisible
 import java.io.File
@@ -50,6 +53,9 @@ class MimeTypeTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.PREF_SHOW_INTRO, false)
       putBoolean(SharedPreferenceUtil.PREF_WIFI_ONLY, false)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test

app/src/androidTest/java/org/kiwix/kiwixmobile/nav/destination/library/LocalLibraryTest.kt

@@ -20,6 +20,7 @@ package org.kiwix.kiwixmobile.nav.destination.library
 
 import androidx.core.content.ContextCompat
 import androidx.core.content.edit
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
@@ -65,11 +66,14 @@ class LocalLibraryTest : BaseActivityTest() {
       // manage external storage permission dialog on android 11 and above
       putBoolean(SharedPreferenceUtil.PREF_MANAGE_EXTERNAL_FILES, false)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun testLocalLibrary() {
-    ActivityScenario.launch(KiwixMainActivity::class.java).onActivity {
+    activityScenario.onActivity {
       it.navigate(R.id.libraryFragment)
     }
     library {

app/src/androidTest/java/org/kiwix/kiwixmobile/note/NoteFragmentTest.kt

@@ -18,6 +18,8 @@
 
 package org.kiwix.kiwixmobile.note
 
+import androidx.lifecycle.Lifecycle
+import androidx.test.core.app.ActivityScenario
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
 import leakcanary.LeakAssertions
@@ -26,6 +28,7 @@ import org.junit.Rule
 import org.junit.Test
 import org.kiwix.kiwixmobile.BaseActivityTest
 import org.kiwix.kiwixmobile.R
+import org.kiwix.kiwixmobile.main.KiwixMainActivity
 import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
 import org.kiwix.kiwixmobile.testutils.TestUtils.isSystemUINotRespondingDialogVisible
@@ -44,11 +47,14 @@ class NoteFragmentTest : BaseActivityTest() {
       }
       waitForIdle()
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun verifyNoteFragment() {
-    activityScenarioRule.scenario.onActivity {
+    activityScenario.onActivity {
       it.navigate(R.id.notesFragment)
     }
     note {

app/src/androidTest/java/org/kiwix/kiwixmobile/page/history/NavigationHistoryTest.kt

@@ -20,6 +20,7 @@ package org.kiwix.kiwixmobile.page.history
 
 import androidx.core.content.edit
 import androidx.core.net.toUri
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.internal.runner.junit4.statement.UiThreadStatement
@@ -63,11 +64,14 @@ class NavigationHistoryTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.PREF_WIFI_ONLY, false)
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun navigationHistoryDialogTest() {
-    ActivityScenario.launch(KiwixMainActivity::class.java).onActivity {
+    activityScenario.onActivity {
       kiwixMainActivity = it
       kiwixMainActivity.navigate(R.id.libraryFragment)
     }

app/src/androidTest/java/org/kiwix/kiwixmobile/reader/KiwixReaderFragmentTest.kt

@@ -20,6 +20,7 @@ package org.kiwix.kiwixmobile.reader
 
 import androidx.core.content.edit
 import androidx.core.net.toUri
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.internal.runner.junit4.statement.UiThreadStatement
@@ -62,11 +63,14 @@ class KiwixReaderFragmentTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.PREF_WIFI_ONLY, false)
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun testTabClosedDialog() {
-    ActivityScenario.launch(KiwixMainActivity::class.java).onActivity {
+    activityScenario.onActivity {
       kiwixMainActivity = it
       kiwixMainActivity.navigate(R.id.libraryFragment)
     }

app/src/androidTest/java/org/kiwix/kiwixmobile/search/SearchFragmentTest.kt

@@ -19,6 +19,7 @@ package org.kiwix.kiwixmobile.search
 
 import androidx.core.content.edit
 import androidx.core.net.toUri
+import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
 import androidx.test.internal.runner.junit4.statement.UiThreadStatement
@@ -62,11 +63,14 @@ class SearchFragmentTest : BaseActivityTest() {
       putBoolean(SharedPreferenceUtil.PREF_WIFI_ONLY, false)
       putBoolean(SharedPreferenceUtil.PREF_IS_TEST, true)
     }
+    activityScenario = ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+      moveToState(Lifecycle.State.RESUMED)
+    }
   }
 
   @Test
   fun searchFragmentSimple() {
-    ActivityScenario.launch(KiwixMainActivity::class.java).onActivity {
+    activityScenario.onActivity {
       kiwixMainActivity = it
       kiwixMainActivity.navigate(R.id.libraryFragment)
     }

core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.kt

@@ -1041,6 +1041,12 @@ abstract class CoreReaderFragment :
       tts = null
     }
     tempWebViewForUndo = null
+    // to fix IntroFragmentTest see https://github.com/kiwix/kiwix-android/pull/3217
+    try {
+      requireActivity().unbindService(serviceConnection)
+    } catch (ignore: IllegalArgumentException) {
+      // to handle if service is already unbounded
+    }
     readAloudService?.registerCallBack(null)
     readAloudService = null
     storagePermissionForNotesLauncher?.unregister()