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 = {})
+    }
+  }
+}

feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_foldable landscape (day)_41c0d57c_0.png

@@ -0,0 +1,3 @@
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+size 279488

feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_foldable landscape (night)_9dae7e43_0.png

@@ -0,0 +1,3 @@
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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_foldable portrait (day)_bf09cc79_0.png

@@ -0,0 +1,3 @@
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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_phone landscape (day)_38357cfa_0.png

@@ -0,0 +1,3 @@
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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_phone landscape (night)_2eebbf71_0.png

@@ -0,0 +1,3 @@
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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_phone portrait (day)_1526b652_0.png

@@ -0,0 +1,3 @@
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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_rtl_5cbb5cfd_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_small foldable landscape (day)_de1bb092_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_small foldable landscape (night)_fe962c61_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_small foldable portrait (day)_e269713d_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_tablet landscape (day)_308754cb_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_tablet landscape (night)_d25401fe_0.png

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feature/registration/src/screenshotTestDebug/reference/org/signal/registration/screens/welcome/WelcomeScreenScreenshotTests/WelcomeScreenPhonePreview_tablet portrait (day)_ae17fb11_0.png

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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"