Screenshot testing

Author: Wavesonics

app/build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
 	alias(libs.plugins.kotlin.android)
 	alias(libs.plugins.kotlin.compose)
 	alias(libs.plugins.kotlin.serialization)
+	alias(libs.plugins.screenshot)
 	id("kotlin-parcelize")
 }
 
@@ -74,6 +75,12 @@ android {
 		includeInApk = false
 		includeInBundle = false
 	}
+	experimentalProperties["android.experimental.enableScreenshotTest"] = true
+	testOptions {
+		screenshotTests {
+			imageDifferenceThreshold = 0.0001f // 0.01%
+		}
+	}
 }
 
 dependencies {
@@ -135,4 +142,5 @@ dependencies {
 	debugImplementation(libs.ui.test.manifest)
 	debugImplementation(libs.androidx.ui.tooling)
 	debugImplementation(libs.androidx.ui.test.manifest)
+	screenshotTestImplementation(libs.androidx.compose.ui.tooling)
 }

build.gradle.kts

@@ -3,4 +3,5 @@ plugins {
 	alias(libs.plugins.android.application) apply false
 	alias(libs.plugins.kotlin.android) apply false
 	alias(libs.plugins.kotlin.compose) apply false
+	alias(libs.plugins.screenshot) apply false
 }

gradle.properties

@@ -20,4 +20,5 @@ kotlin.code.style=official
 # Enables namespacing of each library's R class so that its R class includes only the
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
-android.nonTransitiveRClass=true
+android.nonTransitiveRClass=true
+android.experimental.enableScreenshotTest=true

gradle/libs.versions.toml

@@ -38,6 +38,7 @@ zoomable = "2.6.0"
 cameraCamera2 = "1.4.2"
 cameraView = "1.4.2"
 foundation = "1.8.1"
+screenshot = "0.0.1-alpha09"
 
 [libraries]
 accompanist-permissions = { module = "com.google.accompanist:accompanist-permissions", version.ref = "accompanistPermissions" }
@@ -93,9 +94,11 @@ ui-test-junit4 = { module = "androidx.compose.ui:ui-test-junit4" }
 ui-test-manifest = { module = "androidx.compose.ui:ui-test-manifest" }
 zoomable = { module = "net.engawapg.lib:zoomable", version.ref = "zoomable" }
 androidx-work-runtime-ktx = { module = "androidx.work:work-runtime-ktx", version.ref = "workManager" }
+androidx-compose-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
+screenshot = { id = "com.android.compose.screenshot", version.ref = "screenshot" }