Fix flaky instrumentation tests, Compose timeouts, and NPE crashes

app/src/androidTest/java/com/google/jetpackcamera/utils/ComposeTestRuleExt.kt

@@ -48,6 +48,7 @@ import androidx.test.core.app.ApplicationProvider
 import androidx.test.espresso.action.ViewActions.swipeDown
 import com.google.common.truth.Truth.assertThat
 import com.google.errorprone.annotations.CanIgnoreReturnValue
+import com.google.jetpackcamera.core.common.ignoreResult
 import com.google.jetpackcamera.model.CaptureMode
 import com.google.jetpackcamera.model.ConcurrentCameraMode
 import com.google.jetpackcamera.model.FlashMode
@@ -187,24 +188,6 @@ fun ComposeTestRule.waitForSnackbarWithText(
     }
 }
 
-private fun ComposeTestRule.idleForVideoDuration(
-    durationMillis: Long = VIDEO_DURATION_MILLIS,
-    earlyExitPredicate: () -> Boolean = {
-        // If the video capture fails, there is no point to continue the recording, so stop idling
-        onNodeWithText(
-            com.google.jetpackcamera.ui.uistateadapter.capture.R.string.toast_video_capture_failure
-        ).isDisplayed()
-    }
-) {
-    // TODO: replace with a check for the timestamp UI of the video duration
-    try {
-        waitUntil(timeoutMillis = durationMillis) {
-            earlyExitPredicate()
-        }
-    } catch (_: ComposeTimeoutException) {
-    }
-}
-
 fun ComposeTestRule.ensureTagNotAppears(
     componentTag: String,
     timeoutMillis: Long = DEFAULT_TIMEOUT_MILLIS
@@ -248,13 +231,9 @@ private fun ComposeTestRule.waitUntilVideoRecordingDurationAtLeast(
 ) {
     waitUntil(timeoutMillis = ELAPSED_TIME_TEXT_TIMEOUT_MILLIS) {
         checkWhileWaiting()
-        val text = onNodeWithTag(ELAPSED_TIME_TAG)
-            .fetchSemanticsNode()
-            .config.getOrNull(SemanticsProperties.Text)
-            ?.firstOrNull()?.text
-
+        val text = onAllNodesWithTag(ELAPSED_TIME_TAG).fetchSemanticsNodes()
+            .firstOrNull()?.config?.getOrNull(SemanticsProperties.Text)?.firstOrNull()?.text
         val duration = text?.let { parseMinSecToMillis(it) }
-
         duration != null && duration >= durationMillis
     }
 }
@@ -333,12 +312,12 @@ fun ComposeTestRule.longClickForVideoRecording(durationMillis: Long = VIDEO_DURA
     }
 }
 
-fun ComposeTestRule.tapStartLockedVideoRecording() {
+fun ComposeTestRule.tapStartLockedVideoRecording(durationMillis: Long = VIDEO_DURATION_MILLIS) {
     assertThat(getCurrentCaptureMode()).isEqualTo(CaptureMode.VIDEO_ONLY)
     onNodeWithTag(CAPTURE_BUTTON)
         .assertExists()
         .performClick()
-    idleForVideoDuration()
+    waitUntilVideoRecordingDurationAtLeast(durationMillis)
 }
 
 // //////////////////////
@@ -409,7 +388,7 @@ inline fun <reified T> ComposeTestRule.checkComponentContentDescriptionState(
     waitForNodeWithTag(nodeTag)
     onNodeWithTag(nodeTag).assume(isEnabled()) { "$nodeTag is not enabled" }
         .fetchSemanticsNode().let { node ->
-            node.config[SemanticsProperties.ContentDescription].forEach { description ->
+            for (description in node.config[SemanticsProperties.ContentDescription]) {
                 val result = block(description)
                 if (result != null) return result
             }
@@ -451,7 +430,7 @@ fun ComposeTestRule.getCurrentLensFacing(): LensFacing = visitQuickSettings {
     onNodeWithTag(QUICK_SETTINGS_FLIP_CAMERA_BUTTON).fetchSemanticsNode(
         "Flip camera button is not visible when expected."
     ).let { node ->
-        node.config[SemanticsProperties.ContentDescription].forEach { description ->
+        for (description in node.config[SemanticsProperties.ContentDescription]) {
             when (description) {
                 getResString(CaptureR.string.quick_settings_front_camera_description) ->
                     return@let LensFacing.FRONT
@@ -468,7 +447,7 @@ fun ComposeTestRule.getCurrentFlashMode(): FlashMode = visitQuickSettings {
     onNodeWithTag(QUICK_SETTINGS_FLASH_BUTTON).fetchSemanticsNode(
         "Flash button is not visible when expected."
     ).let { node ->
-        node.config[SemanticsProperties.ContentDescription].forEach { description ->
+        for (description in node.config[SemanticsProperties.ContentDescription]) {
             when (description) {
                 getResString(CaptureR.string.quick_settings_flash_off_description) ->
                     return@let FlashMode.OFF
@@ -494,7 +473,7 @@ fun ComposeTestRule.getCurrentCaptureMode(): CaptureMode = visitQuickSettings {
     onNodeWithTag(BTN_QUICK_SETTINGS_FOCUS_CAPTURE_MODE).fetchSemanticsNode(
         "Capture mode button is not visible when expected."
     ).let { node ->
-        node.config[SemanticsProperties.ContentDescription].forEach { description ->
+        for (description in node.config[SemanticsProperties.ContentDescription]) {
             // check description is one of the capture modes
             when (description) {
                 getResString(CaptureR.string.quick_settings_description_capture_mode_standard) ->
@@ -682,7 +661,7 @@ inline fun <T> ComposeTestRule.visitQuickSettings(
                 // It's visible, so perform the swipe down
                 bottomSheetNode.performTouchInput {
                     down(center)
-                    swipeDown()
+                    swipeDown().ignoreResult()
                     up()
                 }
 

app/src/androidTest/java/com/google/jetpackcamera/utils/UiTestUtil.kt

@@ -92,7 +92,7 @@ fun mergeWithCompatExtras(extras: Bundle?): Bundle {
 val debugExtra: Bundle = Bundle().apply { putBoolean("KEY_DEBUG_MODE", true) }
 val cacheExtra: Bundle = Bundle().apply { putBoolean("KEY_REVIEW_AFTER_CAPTURE", true) }
 
-const val DEFAULT_TIMEOUT_MILLIS = 5_000L
+const val DEFAULT_TIMEOUT_MILLIS = 15_000L
 const val APP_START_TIMEOUT_MILLIS = 20_000L
 const val ELAPSED_TIME_TEXT_TIMEOUT_MILLIS = 45_000L
 const val SCREEN_FLASH_OVERLAY_TIMEOUT_MILLIS = 5_000L
@@ -101,7 +101,7 @@ const val VIDEO_CAPTURE_TIMEOUT_MILLIS = 15_000L
 const val SAVE_MEDIA_TIMEOUT_MILLIS = 15_000L
 const val IMAGE_WELL_LOAD_TIMEOUT_MILLIS = 10_000L
 
-const val VIDEO_DURATION_MILLIS = 3_000L
+const val VIDEO_DURATION_MILLIS = 1_000L
 const val MESSAGE_DISAPPEAR_TIMEOUT_MILLIS = 15_000L
 const val FOCUS_METERING_INDICATOR_TIMEOUT_MILLIS = 10_000L
 const val FILE_PREFIX = "JCA"
@@ -111,6 +111,7 @@ const val COMPONENT_PACKAGE_NAME = "com.google.jetpackcamera"
 const val COMPONENT_CLASS = "com.google.jetpackcamera.MainActivity"
 private const val TAG = "UiTestUtil"
 
+@Suppress("ImmutableEnum")
 internal enum class CacheParam(val extras: Bundle?) {
     NO_CACHE(null),
     WITH_CACHE(cacheExtra)
@@ -168,17 +169,17 @@ inline fun runMainActivityMediaStoreAutoDeleteScenarioTest(
 
             val detectedNumFiles = insertedMediaStoreEntries.size
             // Delete all inserted files that we know about at this point
-            insertedMediaStoreEntries.forEach {
-                Log.d(debugTag, "Deleting media store file: $it")
+            for (entry in insertedMediaStoreEntries) {
+                Log.d(debugTag, "Deleting media store file: $entry")
                 val deletedRows = instrumentation.targetContext.contentResolver.delete(
-                    it.value,
+                    entry.value,
                     null,
                     null
                 )
                 if (deletedRows > 0) {
                     Log.d(debugTag, "Deleted $deletedRows files")
                 } else {
-                    Log.e(debugTag, "Failed to delete ${it.key}")
+                    Log.e(debugTag, "Failed to delete ${entry.key}")
                 }
             }
 
@@ -253,9 +254,9 @@ inline fun <reified T : Activity> runScenarioTestForResult(
     crossinline block: ActivityScenario<T>.() -> Unit
 ): Instrumentation.ActivityResult {
     activityExtras?.let { intent.putExtras(it) }
-    ActivityScenario.launchActivityForResult<T>(intent).use { scenario ->
+    return ActivityScenario.launchActivityForResult<T>(intent).use { scenario ->
         scenario.apply(block)
-        return runBlocking { scenario.pollResult() }
+        runBlocking { scenario.pollResult() }
     }
 }
 

core/camera/src/androidTest/java/com/google/jetpackcamera/core/camera/CameraXCameraSystemTest.kt

@@ -32,6 +32,7 @@ import com.google.jetpackcamera.core.camera.postprocess.ImagePostProcessorFeatur
 import com.google.jetpackcamera.core.camera.postprocess.PostProcessModule.Companion.provideImagePostProcessorMap
 import com.google.jetpackcamera.core.camera.utils.APP_REQUIRED_PERMISSIONS
 import com.google.jetpackcamera.core.camera.utils.provideUpdatingSurface
+import com.google.jetpackcamera.core.common.ignoreResult
 import com.google.jetpackcamera.core.common.testing.FakeFilePathGenerator
 import com.google.jetpackcamera.model.CaptureMode
 import com.google.jetpackcamera.model.DynamicRange
@@ -87,7 +88,7 @@ class CameraXCameraSystemTest {
         GrantPermissionRule.grant(*(APP_REQUIRED_PERMISSIONS).toTypedArray())
 
     private val instrumentation = InstrumentationRegistry.getInstrumentation()
-    private val context = instrumentation.context
+    private val context = instrumentation.targetContext
     private val application = context.applicationContext as Application
     private val filesToDelete = mutableSetOf<Uri>()
     private lateinit var cameraSystemScope: CoroutineScope
@@ -136,7 +137,7 @@ class CameraXCameraSystemTest {
         cameraSystem.startCameraAndWaitUntilRunning()
 
         // Act.
-        cameraSystem.takePicture(context.contentResolver, SaveLocation.Default) {}
+        cameraSystem.takePicture(context.contentResolver, SaveLocation.Default) {}.ignoreResult()
 
         // Assert.
         assertThat(imagePostProcessor.postProcessImageCalled).isTrue()
@@ -155,7 +156,7 @@ class CameraXCameraSystemTest {
             cameraSystem.takePicture(
                 context.contentResolver,
                 SaveLocation.Explicit(Uri.parse("asdfasdf"))
-            ) {}
+            ) {}.ignoreResult()
         } catch (e: Exception) {}
 
         // Assert.
@@ -173,7 +174,10 @@ class CameraXCameraSystemTest {
 
         // Act.
         try {
-            cameraSystem.takePicture(context.contentResolver, SaveLocation.Default) {}
+            cameraSystem.takePicture(
+                context.contentResolver,
+                SaveLocation.Default
+            ) {}.ignoreResult()
         } catch (e: RuntimeException) {
             // Assert.
             assertThat(imagePostProcessor.postProcessImageCalled).isTrue()
@@ -195,7 +199,7 @@ class CameraXCameraSystemTest {
         cameraSystem.startCameraAndWaitUntilRunning()
 
         // Act.
-        cameraSystem.takePicture(context.contentResolver, SaveLocation.Default) {}
+        cameraSystem.takePicture(context.contentResolver, SaveLocation.Default) {}.ignoreResult()
 
         // Assert.
         assertThat(imagePostProcessor.postProcessImageCalled).isFalse()
@@ -550,9 +554,9 @@ class CameraXCameraSystemTest {
         assume().withMessage("Ultra HDR not supported on $lensFacing, skip the test.")
             .that(
                 cameraConstraints != null &&
-                    cameraConstraints.supportedImageFormatsMap[false]?.contains(
-                        ImageOutputFormat.JPEG_ULTRA_HDR
-                    ) == true
+                    cameraConstraints.supportedImageFormatsMap[
+                        DEFAULT_CAMERA_APP_SETTINGS.streamConfig
+                    ]?.contains(ImageOutputFormat.JPEG_ULTRA_HDR) == true
             ).isTrue()
 
         cameraSystem.setLensFacing(lensFacing)
@@ -645,9 +649,9 @@ class CameraXCameraSystemTest {
         assume().withMessage("Ultra HDR not supported on $lensFacing, skip the test.")
             .that(
                 cameraConstraints != null &&
-                    cameraConstraints.supportedImageFormatsMap[false]?.contains(
-                        ImageOutputFormat.JPEG_ULTRA_HDR
-                    ) == true
+                    cameraConstraints.supportedImageFormatsMap[
+                        DEFAULT_CAMERA_APP_SETTINGS.streamConfig
+                    ]?.contains(ImageOutputFormat.JPEG_ULTRA_HDR) == true
             ).isTrue()
 
         // Configure the camera to use the target lens and enable Ultra HDR

core/common/src/main/java/com/google/jetpackcamera/core/common/IgnoreResultExt.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.jetpackcamera.core.common
+
+/**
+ * Explicitly ignores return results, particularly handy to suppress ErrorProne warnings
+ * on @CheckResult methods.
+ */
+fun <T> T.ignoreResult() = Unit

feature/preview/src/main/java/com/google/jetpackcamera/feature/preview/PreviewViewModel.kt

@@ -110,8 +110,9 @@ class PreviewViewModel @Inject constructor(
     val surfaceRequest: StateFlow<SurfaceRequest?> =
         cameraSystemRepository.cameraSystem.getSurfaceRequest()
 
-    private val _captureEvents = Channel<CaptureEvent>()
-    val captureEvents: ReceiveChannel<CaptureEvent> = _captureEvents
+    private val outgoingCaptureEvents = Channel<CaptureEvent>(capacity = Channel.UNLIMITED)
+    val captureEvents: ReceiveChannel<CaptureEvent> = outgoingCaptureEvents
+    private val incomingCaptureEvents = Channel<CaptureEvent>(capacity = Channel.UNLIMITED)
 
     private val externalCaptureMode: ExternalCaptureMode = savedStateHandle.getExternalCaptureMode()
     private val externalUris: List<Uri> = savedStateHandle.getCaptureUris()
@@ -223,7 +224,7 @@ class PreviewViewModel @Inject constructor(
                 Pair(SaveLocation.Default, null)
             }
         },
-        captureEvents = _captureEvents,
+        captureEvents = incomingCaptureEvents,
         imageWellController = imageWellController,
         coroutineContext = viewModelScope.coroutineContext
     )
@@ -271,7 +272,7 @@ class PreviewViewModel @Inject constructor(
             launch {
                 for (event in captureController.captureEvents) {
                     showSnackbarForCaptureEvent(event)
-                    _captureEvents.send(event)
+                    outgoingCaptureEvents.send(event)
                 }
             }
         }