Make JVM Android Integration Test Visible
Roborazzi now supports Robolectric Native Graphics (RNG) and enables screenshot testing.📣
Screenshot testing is key to validate your app's appearance and functionality. It efficiently detects visual issues and tests the app as users would use it, making it easier to spot problems. It's quicker than writing many assert statements, ensuring your app looks right and behaves correctly.
JVM tests, also known as local tests, are placed in the test/ directory and are run on a developer's PC or CI environment. On the other hand, device tests, also known as Instrumentation tests, are written in the androidTest/ directory and are run on real devices or emulators. Device testing can result in frequent failures due to the device environment, leading to false negatives. These failures are often hard to reproduce, making them tough to resolve.
Paparazzi is a great tool for visualizing displays within the JVM. However, it's incompatible with Robolectric, which also mocks the Android framework.
Roborazzi fills this gap. It integrates with Robolectric, allowing tests to run with Hilt and interact with components. Essentially, Roborazzi enhances Paparazzi's capabilities, providing a more efficient and reliable testing process by capturing screenshots with Robolectric.
Leveraging Roborazzi in Test Architecture: An Example
Integrating Roborazzi into the Architecture: An Example from DroidKaigi 2023 App
In the DroidKaigi 2023 app, Roborazzi was introduced from the early stages of development as part of the architectural design. This integration allowed the team to verify changes throughout the development process. The specific architectural decisions and how they were implemented can be found README.
Available on Maven Central.
This is an example of adding Robolectric to your project: https://github.com/takahirom/roborazzi-usage-examples/compare/b697...5c12
This library is dependent on Robolectric. Please see below to add Robolectric.
https://robolectric.org/getting-started/
This is an example of adding Roborazzi to your project: https://github.com/takahirom/roborazzi-usage-examples/commit/3a02
To take screenshots, please use Robolectric 4.10 alpha 1 or later and please
add @GraphicsMode(GraphicsMode.Mode.NATIVE) to your test class.
@GraphicsMode(GraphicsMode.Mode.NATIVE)Roborazzi is available on maven central.
This plugin simply creates Gradle tasks record, verify, compare and passes the configuration to the test.
build.gradle.kts
| plugins | buildscript |
|
Define plugin in root build.gradle.kts plugins {
...
id("io.github.takahirom.roborazzi") version "[version]" apply false
}Apply plugin in module build.gradle.kts plugins {
...
id("io.github.takahirom.roborazzi")
} |
root build.gradle.kts buildscript {
dependencies {
...
classpath("io.github.takahirom.roborazzi:roborazzi-gradle-plugin:[version]")
}
}module build.gradle.kts plugins {
...
id("io.github.takahirom.roborazzi")
} |
build.gradle version
| plugins | buildscript |
|
Define plugin in root build.gradle plugins {
...
id "io.github.takahirom.roborazzi" version "[version]" apply false
}Apply plugin in module build.gradle plugins {
...
id 'io.github.takahirom.roborazzi'
} |
root build.gradle buildscript {
dependencies {
...
classpath "io.github.takahirom.roborazzi:roborazzi-gradle-plugin:[version]"
}
}module build.gradle apply plugin: "io.github.takahirom.roborazzi" |
| Use Roborazzi task | Use default unit test task | Description |
|
|
or
|
Record a screenshot |
|
|
or
|
Review changes made to an image. This action will
compare the current image with the saved one, generating a comparison image labeled
as |
|
|
or
|
Validate changes made to an image. If there is any difference between the current image and the saved one, the test will fail. |
|
|
or
|
This task will first verify the images and, if differences are detected, it will record a new baseline. |
|
|
This is not a test task. |
Note: This is an experimental task. This task will clear the saved images. This task also deletes the cached images. Please be careful when using this task. |
The comparison image, saved as [original]_compare.png, is shown below:
You can check the test report in build/reports/roborazzi/index.html
This uses JetNew from Compose Samples. You can check the pull request introducing Roborazzi to the compose-samples here.
| Description | Dependencies |
|---|---|
| Core functions | testImplementation("io.github.takahirom.roborazzi:roborazzi:[version]") |
| Jetpack Compose | testImplementation("io.github.takahirom.roborazzi:roborazzi-compose:[version]") |
| JUnit rules | testImplementation("io.github.takahirom.roborazzi:roborazzi-junit-rule:[version]") |
You can take a screenshot by calling captureRoboImage().
app/src/test/java/../ManualTest.kt
import androidx.compose.ui.test.junit4.createAndroidComposeRule
import androidx.test.core.app.ActivityScenario
import androidx.test.espresso.Espresso.onView
import androidx.test.ext.junit.runners.AndroidJUnit4
import org.junit.Test
import org.junit.runner.RunWith
import org.robolectric.annotation.GraphicsMode
// All you need to do is use the captureRoboImage function in the test!
import com.github.takahirom.roborazzi.captureRoboImage
// Tips: You can use Robolectric while using AndroidJUnit4
@RunWith(AndroidJUnit4::class)
// Enable Robolectric Native Graphics (RNG)
@GraphicsMode(GraphicsMode.Mode.NATIVE)
class ManualTest {
@get:Rule
val composeTestRule = createAndroidComposeRule<MainActivity>()
@Test
fun captureRoboImageSample() {
// Tips: You can use Robolectric with Espresso API
// launch
ActivityScenario.launch(MainActivity::class.java)
// Capture screen
onView(ViewMatchers.isRoot())
// If you don't specify a screenshot file name, Roborazzi will automatically use the method name as the file name for you.
// The format of the file name will be as follows:
// build/outputs/roborazzi/com_..._ManualTest_captureRoboImageSample.png
.captureRoboImage()
// Capture Jetpack Compose Node
composeTestRule.onNodeWithTag("AddBoxButton")
.onParent()
.captureRoboImage("build/compose.png")
}
}Roborazzi supports the following APIs.
| Capture | Code |
| ✅ Jetpack Compose's onNode() |
composeTestRule.onNodeWithTag("AddBoxButton")
.captureRoboImage() |
| ✅ Espresso's onView() |
onView(ViewMatchers.isRoot())
.captureRoboImage()onView(withId(R.id.button_first))
.captureRoboImage() |
| ✅ View |
val view: View = composeTestRule.activity.findViewById<View>(R.id.button_second)
view.captureRoboImage() |
| ✅ Jetpack Compose lambda |
captureRoboImage() {
Text("Hello Compose!")
} |
|
Experimental🧪 ✅ Captures the entire screen, including dialogs |
captureScreenRoboImage() |
| ✅ Bitmap |
val bitmap: Bitmap = createBitmap(100, 100, Bitmap.Config.ARGB_8888)
.apply {
applyCanvas {
drawColor(android.graphics.Color.YELLOW)
}
}
bitmap.captureRoboImage() |
You can configure the device by using the @Config annotation and RobolectricDeviceQualifiers.
| Configuration | Code |
| ✅ Predefined device configuration |
You can change the device configuration by adding @RunWith(AndroidJUnit4::class)
@GraphicsMode(GraphicsMode.Mode.NATIVE)
@Config(qualifiers = RobolectricDeviceQualifiers.Pixel5)
class RoborazziTest {@Test
@Config(qualifiers = RobolectricDeviceQualifiers.Pixel5)
fun test() { |
| ✅ Night mode |
@Config(qualifiers = "+night") |
| ✅ Locale |
@Config(qualifiers = "+ja") |
| ✅ Screen size |
@Config(qualifiers = RobolectricDeviceQualifiers.MediumTablet) |
It is easy to integrate Roborazzi to your GitHub Actions.
name: store screenshots
on:
push
env:
GRADLE_OPTS: "-Dorg.gradle.jvmargs=-Xmx6g -Dorg.gradle.daemon=false -Dkotlin.incremental=false"
jobs:
test:
runs-on: macos-latest
steps:
- uses: actions/checkout@v3
- uses: actions/[email protected]
with:
distribution: 'zulu'
java-version: 19
- name: Gradle cache
uses: gradle/gradle-build-action@v2
- name: test
run: |
# Create screenshots
./gradlew app:recordRoborazziDebug --stacktrace
# Upload screenshots to GitHub Actions Artifacts
- uses: actions/upload-artifact@v3
with:
name: screenshots
path: app/build/outputs/roborazzi
retention-days: 30name: verify test
on:
push
env:
GRADLE_OPTS: "-Dorg.gradle.jvmargs=-Xmx6g -Dorg.gradle.daemon=false -Dkotlin.incremental=false"
jobs:
test:
runs-on: macos-latest
steps:
- uses: actions/checkout@v3
- uses: actions/[email protected]
with:
distribution: 'zulu'
java-version: 19
- name: Gradle cache
uses: gradle/gradle-build-action@v2
# Download screenshots from main branch
- uses: dawidd6/action-download-artifact@v2
with:
name: screenshots
path: app/build/outputs/roborazzi
workflow: test.yaml
branch: main
- name: verify test
id: verify-test
run: |
# If there is a difference between the screenshots, the test will fail.
./gradlew app:verifyRoborazziDebug --stacktrace
- uses: actions/upload-artifact@v3
if: ${{ always() }}
with:
name: screenshot-diff
path: app/build/outputs/roborazzi
retention-days: 30
- uses: actions/upload-artifact@v3
if: ${{ always() }}
with:
name: screenshot-diff-reports
path: app/build/reports
retention-days: 30
- uses: actions/upload-artifact@v3
if: ${{ always() }}
with:
name: screenshot-diff-test-results
path: app/build/test-results
retention-days: 30
For those who are looking for a more advanced example, we have prepared a sample repository that demonstrates how to use Roborazzi to compare snapshot results on GitHub pull requests. This sample showcases the integration of Roborazzi with GitHub Actions workflows, making it easy to visualize and review the differences between snapshots directly in the pull request comments.
Check out the roborazzi-compare-on-github-comment-sample repository to see this powerful feature in action and learn how to implement it in your own projects.
Example of the comment
RoborazziRule is a JUnit rule for Roborazzi.
RoborazziRule is optional. You can use captureRoboImage() without this rule.
RoborazziRule has two features.
- Provide context such as
RoborazziOptionsandoutputDirectoryPathetc forcaptureRoboImage(). - Capture screenshots for each test when specifying RoborazziRule.options.captureType.
For example, The following code generates an output file
named **custom_outputDirectoryPath**/**custom_outputFileProvider**-com.github.takahirom.roborazzi.sample.RuleTestWithPath.captureRoboImage.png :
@RunWith(AndroidJUnit4::class)
@GraphicsMode(GraphicsMode.Mode.NATIVE)
class RuleTestWithPath {
@get:Rule
val roborazziRule = RoborazziRule(
options = Options(
outputDirectoryPath = "$DEFAULT_ROBORAZZI_OUTPUT_DIR_PATH/custom_outputDirectoryPath",
outputFileProvider = { description, outputDirectory, fileExtension ->
File(
outputDirectory,
"custom_outputFileProvider-${description.testClass.name}.${description.methodName}.$fileExtension"
)
}
),
)
@Test
fun captureRoboImage() {
launch(MainActivity::class.java)
// The file will be saved using the rule's outputDirectoryPath and outputFileProvider
onView(isRoot()).captureRoboImage()
}
}@Test
fun captureRoboGifSample() {
onView(ViewMatchers.isRoot())
.captureRoboGif("build/test.gif") {
// launch
ActivityScenario.launch(MainActivity::class.java)
// move to next page
onView(withId(R.id.button_first))
.perform(click())
// back
pressBack()
// move to next page
onView(withId(R.id.button_first))
.perform(click())
}
}
Note
You don't need to use RoborazziRule if you're using captureRoboImage().
With the JUnit test rule, you do not need to name the gif image, and if you prefer, you can output the gif image only if the test fails.
This test will output this file.
build/outputs/roborazzi/com.github.takahirom.roborazzi.sample.RuleTestWithOnlyFail_captureRoboGifSampleFail.gif
@RunWith(AndroidJUnit4::class)
@GraphicsMode(GraphicsMode.Mode.NATIVE)
class RuleTestWithOnlyFail {
@get:Rule
val roborazziRule = RoborazziRule(
captureRoot = onView(isRoot()),
options = Options(
onlyFail = true,
captureType = RoborazziRule.CaptureType.Gif,
)
)
@Test
fun captureRoboLastImageSampleFail() {
// launch
ActivityScenario.launch(MainActivity::class.java)
// move to next page
onView(withId(R.id.button_first))
.perform(click())
// should fail because the button does not exist
// Due to failure, the gif image will be saved in the outputs folder.
onView(withId(R.id.button_first))
.perform(click())
}
}Test target
@Composable
fun SampleComposableFunction() {
var count by remember { mutableStateOf(0) }
Column(
Modifier
.size(300.dp)
) {
Box(
Modifier
.testTag("AddBoxButton")
.size(50.dp)
.clickable {
count++
}
)
(0..count).forEach {
Box(
Modifier
.size(30.dp)
)
}
}
}Test (Just add RoborazziRule)
@RunWith(AndroidJUnit4::class)
@GraphicsMode(GraphicsMode.Mode.NATIVE)
class ComposeTest {
@get:Rule
val composeTestRule = createAndroidComposeRule<ComponentActivity>()
@get:Rule
val roborazziRule = RoborazziRule(
composeRule = composeTestRule,
captureRoot = composeTestRule.onRoot(),
options = RoborazziRule.Options(
RoborazziRule.CaptureType.Gif()
)
)
@Test
fun composable() {
composeTestRule.setContent {
SampleComposableFunction()
}
(0 until 3).forEach { _ ->
composeTestRule
.onNodeWithTag("AddBoxButton")
.performClick()
}
}
}
You can use some RoborazziRule options
/**
* This rule is a JUnit rule for roborazzi.
* This rule is optional. You can use [captureRoboImage] without this rule.
*
* This rule have two features.
* 1. Provide context such as `RoborazziOptions` and `outputDirectoryPath` etc for [captureRoboImage].
* 2. Capture screenshots for each test when specifying RoborazziRule.options.captureType.
*/
class RoborazziRule private constructor(
private val captureRoot: CaptureRoot,
private val options: Options = Options()
) : TestWatcher() {
/**
* If you add this annotation to the test, the test will be ignored by
* roborazzi's CaptureType.LastImage, CaptureType.AllImage and CaptureType.Gif.
*/
annotation class Ignore
data class Options(
val captureType: CaptureType = CaptureType.None,
/**
* output directory path
*/
val outputDirectoryPath: String = provideRoborazziContext().outputDirectory,
val outputFileProvider: FileProvider = provideRoborazziContext().fileProvider
?: defaultFileProvider,
val roborazziOptions: RoborazziOptions = provideRoborazziContext().options,
)
sealed interface CaptureType {
/**
* Do not generate images. Just provide the image path to [captureRoboImage].
*/
object None : CaptureType
/**
* Generate last images for each test
*/
data class LastImage(
/**
* capture only when the test fail
*/
val onlyFail: Boolean = false,
) : CaptureType
/**
* Generate images for Each layout change like TestClass_method_0.png for each test
*/
data class AllImage(
/**
* capture only when the test fail
*/
val onlyFail: Boolean = false,
) : CaptureType
/**
* Generate gif images for each test
*/
data class Gif(
/**
* capture only when the test fail
*/
val onlyFail: Boolean = false,
) : CaptureType
}data class RoborazziOptions(
val captureType: CaptureType = if (isNativeGraphicsEnabled()) CaptureType.Screenshot() else CaptureType.Dump(),
val compareOptions: CompareOptions = CompareOptions(),
val recordOptions: RecordOptions = RecordOptions(),
) {
sealed interface CaptureType {
class Screenshot : CaptureType
data class Dump(
val takeScreenShot: Boolean = isNativeGraphicsEnabled(),
val basicSize: Int = 600,
val depthSlideSize: Int = 30,
val query: ((RoboComponent) -> Boolean)? = null,
val explanation: ((RoboComponent) -> String?) = DefaultExplanation,
) : CaptureType {
companion object {
val DefaultExplanation: ((RoboComponent) -> String) = {
it.text
}
val AccessibilityExplanation: ((RoboComponent) -> String) = {
it.accessibilityText
}
}
}
}
data class CompareOptions(
val roborazziCompareReporter: RoborazziCompareReporter = RoborazziCompareReporter(),
val resultValidator: (result: ImageComparator.ComparisonResult) -> Boolean,
) {
constructor(
roborazziCompareReporter: RoborazziCompareReporter = RoborazziCompareReporter(),
/**
* This value determines the threshold of pixel change at which the diff image is output or not.
* The value should be between 0 and 1
*/
changeThreshold: Float = 0.01F,
) : this(roborazziCompareReporter, ThresholdValidator(changeThreshold))
}
interface RoborazziCompareReporter {
fun report(compareReportCaptureResult: CompareReportCaptureResult)
companion object {
operator fun invoke(): RoborazziCompareReporter {
...
}
}
class JsonOutputRoborazziCompareReporter : RoborazziCompareReporter {
...
override fun report(compareReportCaptureResult: CompareReportCaptureResult) {
...
}
}
class VerifyRoborazziCompareReporter : RoborazziCompareReporter {
override fun report(compareReportCaptureResult: CompareReportCaptureResult) {
...
}
}
}
data class RecordOptions(
val resizeScale: Double = roborazziDefaultResizeScale(),
val applyDeviceCrop: Boolean = false,
val pixelBitConfig: PixelBitConfig = PixelBitConfig.Argb8888,
)
enum class PixelBitConfig {
Argb8888,
Rgb565;
fun toBitmapConfig(): Bitmap.Config {
...
}
fun toBufferedImageType(): Int {
...
}
}
}If you are having trouble debugging your test, try Dump mode as follows.
Roborazzi provides support for generating screenshot tests and easy setup for Jetpack Compose Preview. This support uses ComposablePreviewScanner to scan the Composable Previews in your project.
You first need to add the Roborazzi plugin to your project. Please refer to the setup guide for more information.
Then you can enable the Compose Preview screenshot test generation feature by adding the following configuration to your build.gradle.kts file:
roborazzi {
generateComposePreviewRobolectricTests {
enable = true
}
}The plugin will not automatically change your settings or add dependencies to prevent conflicts with your existing setup. However, it will provide instructions on what to do next, such as adding dependencies and required code. You can also check the sample project for a complete example.
After that, you can run the recordRoborazziDebug task to generate screenshots using the generated tests, as described in the setup guide.
You can customize the generated test by adding the following configuration to your build.gradle file:
roborazzi {
generateComposePreviewRobolectricTests {
enable = true
// The package names to scan for Composable Previews.
packages = listOf("com.example")
// robolectricConfig will be passed to Robolectric's @Config annotation in the generated test class.
// See https://robolectric.org/configuring/ for more information.
robolectricConfig = mapOf(
"sdk" to "[32]",
"qualifiers" to "RobolectricDeviceQualifiers.Pixel5",
)
// If true, the private previews will be included in the test.
includePrivatePreviews = true
// The fully qualified class name of the custom test class that implements [com.github.takahirom.roborazzi.ComposePreviewTester].
testerQualifiedClassName = "com.example.MyCustomComposePreviewTester"
}
}Roborazzi provides a helper function for ComposablePreviewScanner. You can add the following dependency to your project to use the helper function:
testImplementation("io.github.takahirom.roborazzi:roborazzi-compose-preview-scanner-support:[version]")
Then you can use the ComposablePreview<AndroidPreviewInfo>.captureRoboImage() function to capture the Composable Preview using the settings in Preview annotations.
To obtain the ComposablePreview object, please refer to ComposablePreviewScanner.
fun ComposablePreview<AndroidPreviewInfo>.captureRoboImage(
filePath: String,
roborazziOptions: RoborazziOptions
)Currently, we don't support all the annotation options provided by the Compose Preview. You can check the supported annotations in the source code. We are looking forward to your contributions to support more annotation options.
https://plugins.jetbrains.com/plugin/24561-roborazzi
Demo of Roborazzi IntelliJ IDEA and Android Studio Plugin.
screencast.2024-06-07.10-08-00.mp4
The Roborazzi plugin enhances your development workflow by automatically displaying screenshots related to Roborazzi's screenshot tests within IntelliJ IDEA. Easily view and verify visual outputs directly in your IDE, streamlining your testing and development process.
Roborazzi supports Compose Multiplatform iOS. You can use Roborazzi with Compose iOS as follows:
Gradle settings
plugins {
kotlin("multiplatform")
id("org.jetbrains.compose")
id("io.github.takahirom.roborazzi")
}
kotlin {
sourceSets {
...
val appleTest by getting {
dependencies {
implementation(project("io.github.takahirom.roborazzi:roborazzi-compose-ios:[1.13.0 or higher]"))
implementation(kotlin("test"))
}
}
...
Test with Roborazzi
class IosTest {
@OptIn(ExperimentalTestApi::class)
@Test
fun test() {
runComposeUiTest {
setContent {
MaterialTheme {
Column {
Button(
modifier = Modifier.alpha(alpha),
onClick = { }) {
Text("Hello World")
}
Box(
modifier = Modifier
.background(Color.Red.copy(alpha = alpha), MaterialTheme.shapes.small)
.size(100.dp),
)
}
}
}
onRoot().captureRoboImage(this, filePath = "ios.png")
onNodeWithText("Hello World").captureRoboImage(
this,
filePath = "ios_button.png"
)
}
}
}Then, you can run the Gradle tasks for iOS Support, just like you do for Android Support.
./gradlew recordRoborazzi[SourceSet]
./gradlew recordRoborazziIosSimulatorArm64
./gradlew compareRoborazziIosSimulatorArm64
./gradlew verifyRoborazziIosSimulatorArm64
...
The currently implemented features for iOS support are as follows:
| Feature | status |
|---|---|
| Record | supported |
| Compare | supported |
| Verify | supported |
| Report | supported |
| Dropbox/Differ comparison | 🆖 |
| dump | 🆖 |
| resizing image | 🆖 |
| context data | 🆖 |
| custom reporter | 🆖 |
| RoborazziRecordFilePathStrategy | 🆖 |
| ComparisonStyle | 🆖 |
| resultValidator | 🆖 |
| resultValidator | 🆖 |
| applyDeviceCrop | 🆖 |
| pixelBitConfig | 🆖 |
We are migrating JVM implementation to Multiplatform implementation. So, some features are not supported yet. We are looking for contributors to help us implement these features.
Roborazzi supports Compose Desktop. You can use Roborazzi with Compose Desktop as follows:
Gradle settings
plugins {
kotlin("multiplatform")
id("org.jetbrains.compose")
id("io.github.takahirom.roborazzi")
}
kotlin {
// You can use your source set name
jvm("desktop")
sourceSets {
...
val desktopTest by getting {
dependencies {
implementation(project("io.github.takahirom.roborazzi:roborazzi-compose-desktop:[1.6.0-alpha-2 or higher]"))
implementation(kotlin("test"))
}
}
...
// Roborazzi Desktop support uses Context Receivers
tasks.withType<KotlinCompile>().configureEach {
kotlinOptions {
freeCompilerArgs += "-Xcontext-receivers"
}
}Test target Composable function
@Composable
fun App() {
var text by remember { mutableStateOf("Hello, World!") }
MaterialTheme {
Button(
modifier = Modifier.testTag("button"),
onClick = {
text = "Hello, Desktop!"
}) {
Text(
style = MaterialTheme.typography.h2,
text = text
)
}
}
}Test with Roborazzi
class MainKmpTest {
@OptIn(ExperimentalTestApi::class)
@Test
fun test() = runDesktopComposeUiTest {
setContent {
App()
}
val roborazziOptions = RoborazziOptions(
recordOptions = RoborazziOptions.RecordOptions(
resizeScale = 0.5
),
compareOptions = RoborazziOptions.CompareOptions(
changeThreshold = 0F
)
)
onRoot().captureRoboImage(roborazziOptions = roborazziOptions)
onNodeWithTag("button").performClick()
onRoot().captureRoboImage(roborazziOptions = roborazziOptions)
}
}Then, you can run the Gradle tasks for Desktop Support, just like you do for Android Support.
./gradlew recordRoborazzi[SourceSet]
./gradlew recordRoborazziDesktop
./gradlew compareRoborazziDesktop
./gradlew verifyRoborazziDesktop
...
If you use the Kotlin JVM plugin, the task will be recordRoborazzi**Jvm**.
The sample image
You can configure the following options in your gradle.properties file:
This option enables you to configure the behavior of Roborazzi. By default, all settings are set to false. For additional configuration options, please refer to the 'Apply Roborazzi Gradle Plugin' section.
roborazzi.test.record=true
# roborazzi.test.compare=true
# roborazzi.test.verify=true
This option lets you set the resize scale for the image being recorded. The default value is 1.0.
roborazzi.record.resizeScale=0.5
This setting allows you to specify the file path strategy for the recorded image. The default strategy is relativePathFromCurrentDirectory. If you choose relativePathFromRoborazziContextOutputDirectory, the file will be saved in the output directory specified by RoborazziRule.Options.outputDirectoryPath.
roborazzi.record.filePathStrategy=relativePathFromRoborazziContextOutputDirectory
This option enables you to define the naming strategy for the recorded image. The default strategy is testPackageAndClassAndMethod.
- If you choose
testPackageAndClassAndMethod, the file name will becom.example.MyTest.testMethod.png. - If you choose
escapedTestPackageAndClassAndMethod, the file name will becom_example_MyTest.testMethod.png. - If you choose
testClassAndMethod, the file name will beMyTest.testMethod.png.
roborazzi.record.namingStrategy=testClassAndMethod
I recommend setting it.systemProperties["robolectric.pixelCopyRenderMode"] = "hardware" in your build.gradle file to enhance the accuracy of your screenshots. For more details, please refer to the issue.
android {
testOptions {
...
unitTests {
isIncludeAndroidResources = true
isReturnDefaultValues = true
all {
it.systemProperties["robolectric.pixelCopyRenderMode"] = "hardware"
}
A: To run only screenshot tests, you can configure your project with the following:
android {
testOptions {
unitTests {
all {
// -Pscreenshot to filter screenshot tests
it.useJUnit {
if (project.hasProperty("screenshot")) {
includeCategories("io.github.takahirom.roborazzi.testing.category.ScreenshotTests")
}
}
}
}
}
}Include the -Pscreenshot property, and only the screenshot tests will be run.
Note: This feature is not provided in the Roborazzi library itself, to keep it simple and utilize JUnit's built-in features for test filtering.
You can also annotate your tests like this:
/**
* You can filter ScreenshotTests using -Pscreenshot parameter
*/
interface ScreenshotTests
@Test
@Category(ScreenshotTests::class)
fun checkLaunchShot() {
onRoot().captureRoboImage(roborazziOptions = roborazziOptions)
}This allows you to create a category of screenshot tests and filter them using the -Pscreenshot property, thus making it easier to run only those specific tests.
A: To execute screenshot tests using Android Studio's Run button, configure your project as follows:
gradle.properties
roborazzi.test.record=trueAfter that, you can execute screenshot tests using either Android Studio's Run or Debug button as you normally would.
A: If your screenshot tests are not capturing images, there may be several patterns that are causing this issue. Please follow these troubleshooting steps:
- Enable Debugging: Set
ROBORAZZI_DEBUG = trueto see logs. - Check Plugin: Ensure that the plugin is properly applied.
- Run Task: Verify that the
recordRoborazziDebugtask is running. - Call Method: Confirm that
captureRoboImage()is being called.
By following these steps, you should be able to identify and resolve the issue causing the screenshot tests to not capture images.
A: This warning may occur with Gradle 7.5. Upgrade to Gradle 7.6.2 to resolve this issue. Change the distribution URL in gradle-wrapper.properties:
distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.2-bin.zip
A: As of now, there is no direct support for running Roborazzi with Bazel. However, it is possible to do so. Please refer to the following comment for more details: Roborazzi Bazel Support Comment
Q: My tests are being skipped or, conversely, are being run when they should be skipped. How can I handle caching to address this?
A: The behavior you are experiencing may be related to caching issues. Although it's
experimental, you can set the outputDir parameter in your build.gradle file to handle caching
and improve the stability of your tests. This parameter allows you to specify the output directory
for your screenshots, which can help in managing the cache. Here is how you can set it up:
If you use the default output directory(module/build/outputs/roborazzi), specifying the outputDir
parameter is not necessary. For more reference, you can check
out the issue.
roborazzi {
outputDir = "src/your/screenshot/folder"
}Q: Why do my screenshot tests fail inconsistently across different operating systems like MacOS, Ubuntu, and Windows?
A: This is a known issue caused by variations in how graphics libraries render components on different platforms. This issue is due to variations in how graphics libraries render components on different platforms. As we've seen with Now in Android, there are no guarantees for identical rendering across all environments. To ensure more consistent results, consider configuring your continuous integration (CI) environment to both record and test screenshots. This setup minimizes discrepancies by using the same settings and resources for all tests.
A: First, please check if you are using the correct version of the Android SDK. Consider using API level 28 or higher because it seems that Robolectric Native Graphics doesn't work property on older SDK versions.
You can specify the SDK version like @Config(sdk = [33]) or by using robolectric.properties with sdk=33.
https://robolectric.org/configuring/
If your images are mostly fine but there are some drawing issues like shadows or shape graphics, you can try using Robolectric's Hardware Rendering mode. Please refer to this issue.
A: You may solve this by using unitTests.maxHeapSize to adjust the unit test heap size as follows:
android {
...
testOptions {
unitTests.all {
maxHeapSize = "4096m"
}
}
}It is discussed in this issue. Additionally, it might be worth trying to run your tests with VisualVM to monitor memory usage and identify potential leaks.
Copyright 2023 takahirom
Copyright 2019 Square, Inc.
Copyright 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.
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