Setup basic compose screenshot testing infra for regV5.

.gitattributes

@@ -1 +1,2 @@
 *.ai binary
+**/src/screenshotTest*/reference/**/*.png filter=lfs diff=lfs merge=lfs -text

.github/workflows/android.yml

@@ -20,6 +20,7 @@ jobs:
       # gh api repos/actions/checkout/commits/v6 --jq '.sha'
       with:
           submodules: true
+          lfs: true
 
     - name: set up JDK 17
       uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5

build.gradle.kts

@@ -112,6 +112,7 @@ gradle.projectsEvaluated {
       testTask?.let { dependsOn(it) }
 
       subproject.tasks.findByName("lintDebug")?.let { dependsOn(it) }
+      subproject.tasks.findByName("validateDebugScreenshotTest")?.let { dependsOn(it) }
     }
   }
 

core/ui/src/main/java/org/signal/core/ui/compose/SignalPreviews.kt

@@ -126,5 +126,8 @@ annotation class AllNightPreviews
 @TabletPreviews
 annotation class AllDevicePreviews
 
+@Preview(name = "rtl", locale = "ar")
+annotation class RtlPreview
+
 @Preview(name = "large font", fontScale = 2f)
 annotation class LargeFontPreviews

feature/registration/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
   id("com.squareup.wire")
   alias(libs.plugins.compose.compiler)
   alias(libs.plugins.kotlinx.serialization)
+  alias(testLibs.plugins.compose.screenshot)
 }
 
 android {
@@ -23,6 +24,8 @@ android {
       isIncludeAndroidResources = true
     }
   }
+
+  experimentalProperties["android.experimental.enableScreenshotTest"] = true
 }
 
 wire {
@@ -87,4 +90,9 @@ dependencies {
   androidTestImplementation(testLibs.androidx.test.ext.junit)
   androidTestImplementation(libs.androidx.compose.ui.test.junit4)
   debugImplementation(libs.androidx.compose.ui.test.manifest)
+
+  // Compose screenshot testing
+  screenshotTestImplementation(testLibs.compose.screenshot.validation.api)
+  screenshotTestImplementation(libs.androidx.compose.ui.tooling.core)
+  screenshotTestImplementation(libs.androidx.compose.ui.tooling.preview)
 }

feature/registration/src/screenshotTest/kotlin/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.signal.registration.screens.welcome
+
+import androidx.compose.runtime.Composable
+import com.android.tools.screenshot.PreviewTest
+import org.signal.core.ui.compose.AllDevicePreviews
+import org.signal.core.ui.compose.Previews
+import org.signal.core.ui.compose.RtlPreview
+
+class WelcomeScreenScreenshotTests {
+  @PreviewTest
+  @AllDevicePreviews
+  @RtlPreview
+  @Composable
+  fun WelcomeScreenPhonePreview() {
+    Previews.Preview {
+      WelcomeScreen(onEvent = {})
+    }
+  }
+}

gradle.properties

@@ -15,6 +15,7 @@ org.gradle.caching=true
 org.gradle.configuration-cache=true
 org.gradle.configuration-cache.problems=fail
 android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false
+android.experimental.enableScreenshotTest=true
 
 # We never want to use auto-provisioning, as it breaks reproducible builds.
 # This should not be a problem, because we never configure a "javaRepositories"

gradle/test-libs.versions.toml

@@ -6,8 +6,13 @@ androidx-test = "1.5.0"
 androidx-test-ext-junit = "1.1.5"
 robolectric = "4.15.1"
 espresso = "3.4.0"
+compose-screenshot = "0.0.1-alpha15"
+
+[plugins]
+compose-screenshot = { id = "com.android.compose.screenshot", version.ref = "compose-screenshot" }
 
 [libraries]
+compose-screenshot-validation-api = { module = "com.android.tools.screenshot:screenshot-validation-api", version.ref = "compose-screenshot" }
 junit-junit = "junit:junit:4.13.2"
 androidx-test-core = { module = "androidx.test:core", version.ref = "androidx-test" }
 androidx-test-core-ktx = { module = "androidx.test:core-ktx", version.ref = "androidx-test" }

gradle/verification-metadata.xml

@@ -9985,6 +9985,14 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
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          </artifact>
       </component>
+      <component group="com.android.compose.screenshot" name="screenshot-test-gradle-plugin" version="0.0.1-alpha15">
+         <artifact name="screenshot-test-gradle-plugin-0.0.1-alpha15.jar">
+            <sha256 value="d2c51a9fc18ff0529179c28d1588845eafb406c51e0140c6044588e6d8723a3b" origin="Generated by Gradle"/>
+         </artifact>
+         <artifact name="screenshot-test-gradle-plugin-0.0.1-alpha15.module">
+            <sha256 value="489dd2df432938410703cd817371af3124c8504dc37c49b9ce5b83ba58be5a9d" origin="Generated by Gradle"/>
+         </artifact>
+      </component>
       <component group="com.android.databinding" name="baseLibrary" version="8.10.1">
          <artifact name="baseLibrary-8.10.1.jar">
             <md5 value="d4fb415454f1c7211401c41c9be31e05" origin="Generated by Gradle"/>
@@ -11360,6 +11368,16 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
             <sha256 value="36c25576b19993df360170528cc62b7246c37776d6158154a67cdf8fc2d58e13" origin="Generated by Gradle"/>
          </artifact>
       </component>
+      <component group="com.android.tools.compose" name="compose-preview-detector" version="32.3.0-alpha06">
+         <artifact name="compose-preview-detector-32.3.0-alpha06.jar">
+            <sha256 value="131c4bd7c23707c036ce6d777e2ee8ff27344dfbe16643bbfabc1ec40e17ec10" origin="Generated by Gradle"/>
+         </artifact>
+      </component>
+      <component group="com.android.tools.compose" name="compose-preview-renderer" version="0.0.1-alpha15">
+         <artifact name="compose-preview-renderer-0.0.1-alpha15.jar">
+            <sha256 value="0f5ebdac5c0b4fa2bfe1528fcf8cf1aa86921311f30c67e183921551aaed93ba" origin="Generated by Gradle"/>
+         </artifact>
+      </component>
       <component group="com.android.tools.ddms" name="ddmlib" version="31.10.1">
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@@ -11562,6 +11580,11 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
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+      <component group="com.android.tools.layoutlib" name="layoutlib" version="16.1.0-jdk17">
+         <artifact name="layoutlib-16.1.0-jdk17.jar">
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@@ -11606,6 +11629,19 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
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+      <component group="com.android.tools.layoutlib" name="layoutlib-resources" version="16.1.0-jdk17">
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+      <component group="com.android.tools.layoutlib" name="layoutlib-runtime" version="16.1.0-jdk17">
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@@ -11870,6 +11906,16 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
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+      <component group="com.android.tools.screenshot" name="screenshot-validation-api" version="0.0.1-alpha15">
+         <artifact name="screenshot-validation-api-0.0.1-alpha15.jar">
+            <sha256 value="0d0992a5904eeea16b865edf69338f3aba1e3f8411db58d9c4c9f189afc42bfb" origin="Generated by Gradle"/>
+         </artifact>
+      </component>
+      <component group="com.android.tools.screenshot" name="screenshot-validation-junit-engine" version="0.0.1-alpha15">
+         <artifact name="screenshot-validation-junit-engine-0.0.1-alpha15.jar">
+            <sha256 value="934d5e580825f8e175ee40f4ea65539dffb36ee688649383c058a75008822846" origin="Generated by Gradle"/>
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+      </component>
       <component group="com.android.tools.utp" name="android-device-provider-ddmlib" version="31.10.1">
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@@ -19493,6 +19539,14 @@ https://docs.gradle.org/current/userguide/dependency_verification.html
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