Create mosaic-testing module (#528)

EpicDima · web-flow · commit 321290f5c177 · 2025-01-03T21:55:32.000Z
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,7 @@
 New:
 - Create `mosaic-animation` library, that provides various possibilities for animating Mosaic. An analog of [androidx.compose.animation-core](https://developer.android.com/reference/kotlin/androidx/compose/animation/core/package-summary).
 - Add `IntrinsicSize` and related `Modifier.width/height/requiredWidth/requiredHeight`.
+- New `mosaic-testing` artifact for testing Mosaic.
 
 Changed:
 - Rendering now occurs as fast as possible, although still only when necessary. Previously the maximum FPS was capped to 20 which could cause minor visual delays when processing events.
diff --git a/mosaic-runtime/build.gradle b/mosaic-runtime/build.gradle
@@ -31,6 +31,7 @@ kotlin {
 		}
 		commonTest {
 			dependencies {
+				implementation projects.mosaicTesting
 				implementation libs.kotlin.test
 				implementation libs.kotlinx.coroutines.test
 				implementation libs.assertk
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/AnsiRenderingTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/AnsiRenderingTest.kt
@@ -2,6 +2,7 @@ package com.jakewharton.mosaic
 
 import assertk.assertThat
 import assertk.assertions.isEqualTo
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Column
 import com.jakewharton.mosaic.ui.Row
 import com.jakewharton.mosaic.ui.Static
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/CounterTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/CounterTest.kt
@@ -9,6 +9,8 @@ import assertk.assertThat
 import assertk.assertions.isEqualTo
 import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.modifier.Modifier
+import com.jakewharton.mosaic.testing.TestMosaic
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Alignment
 import com.jakewharton.mosaic.ui.Box
 import com.jakewharton.mosaic.ui.Column
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/DebugRenderingTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/DebugRenderingTest.kt
@@ -9,6 +9,7 @@ import assertk.assertions.isNotNull
 import assertk.assertions.message
 import com.jakewharton.mosaic.layout.drawBehind
 import com.jakewharton.mosaic.modifier.Modifier
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Layout
 import com.jakewharton.mosaic.ui.Row
 import com.jakewharton.mosaic.ui.Static
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/LayoutTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/LayoutTest.kt
@@ -4,6 +4,7 @@ import assertk.assertThat
 import assertk.assertions.isEqualTo
 import com.jakewharton.mosaic.layout.drawBehind
 import com.jakewharton.mosaic.modifier.Modifier
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Column
 import com.jakewharton.mosaic.ui.Layout
 import com.jakewharton.mosaic.ui.Row
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/MosaicTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/MosaicTest.kt
@@ -19,6 +19,7 @@ import com.jakewharton.mosaic.layout.offset
 import com.jakewharton.mosaic.layout.size
 import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.modifier.Modifier
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Box
 import com.jakewharton.mosaic.ui.Column
 import com.jakewharton.mosaic.ui.Filler
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/AspectRatioTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/AspectRatioTest.kt
@@ -7,9 +7,9 @@ import com.jakewharton.mosaic.NodeSnapshots
 import com.jakewharton.mosaic.TestFiller
 import com.jakewharton.mosaic.assertFailure
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.size
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Layout
 import com.jakewharton.mosaic.ui.unit.Constraints
 import com.jakewharton.mosaic.ui.unit.IntSize
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/IntrinsicTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/IntrinsicTest.kt
@@ -7,9 +7,9 @@ import com.jakewharton.mosaic.ConstrainedBox
 import com.jakewharton.mosaic.NodeSnapshots
 import com.jakewharton.mosaic.modifier.Modifier
 import com.jakewharton.mosaic.position
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.size
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Box
 import com.jakewharton.mosaic.ui.Column
 import com.jakewharton.mosaic.ui.Layout
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/OffsetTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/OffsetTest.kt
@@ -6,8 +6,8 @@ import com.jakewharton.mosaic.TestChar
 import com.jakewharton.mosaic.TestFiller
 import com.jakewharton.mosaic.assertFailure
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.s
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Box
 import com.jakewharton.mosaic.ui.unit.IntOffset
 import kotlin.test.Test
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/PaddingTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/PaddingTest.kt
@@ -8,9 +8,9 @@ import com.jakewharton.mosaic.TestChar
 import com.jakewharton.mosaic.TestFiller
 import com.jakewharton.mosaic.assertFailure
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.s
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Layout
 import com.jakewharton.mosaic.ui.unit.Constraints
 import kotlin.test.Test
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/SizeTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/layout/SizeTest.kt
@@ -8,9 +8,9 @@ import com.jakewharton.mosaic.Container
 import com.jakewharton.mosaic.NodeSnapshots
 import com.jakewharton.mosaic.modifier.Modifier
 import com.jakewharton.mosaic.position
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.size
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Alignment
 import com.jakewharton.mosaic.ui.Box
 import com.jakewharton.mosaic.ui.Column
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/snapshotStrategies.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/snapshotStrategies.kt
@@ -0,0 +1,24 @@
+package com.jakewharton.mosaic
+
+import com.jakewharton.mosaic.layout.MosaicNode
+import com.jakewharton.mosaic.testing.SnapshotStrategy
+
+internal object DumpSnapshots : SnapshotStrategy<String> {
+	override fun create(mosaic: Mosaic): String {
+		return mosaic.dump()
+	}
+}
+
+internal object NodeSnapshots : SnapshotStrategy<MosaicNode> {
+	override fun create(mosaic: Mosaic): MosaicNode {
+		return (mosaic as MosaicComposition).rootNode
+	}
+}
+
+internal class RenderingSnapshots(
+	private val rendering: Rendering,
+) : SnapshotStrategy<String> {
+	override fun create(mosaic: Mosaic): String {
+		return rendering.render(mosaic).toString()
+	}
+}
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/stuff.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/stuff.kt
@@ -12,6 +12,7 @@ import com.jakewharton.mosaic.layout.MeasureScope
 import com.jakewharton.mosaic.layout.MosaicNode
 import com.jakewharton.mosaic.layout.Placeable
 import com.jakewharton.mosaic.modifier.Modifier
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.Alignment
 import com.jakewharton.mosaic.ui.Filler
 import com.jakewharton.mosaic.ui.Layout
@@ -53,7 +54,7 @@ inline fun TestFiller(modifier: Modifier = Modifier) {
 }
 
 @Composable
-fun Container(
+internal fun Container(
 	modifier: Modifier = Modifier,
 	alignment: Alignment = Alignment.Center,
 	expanded: Boolean = false,
@@ -158,7 +159,7 @@ suspend fun testIntrinsics(
 }
 
 @Composable
-internal fun ConstrainedBox(
+fun ConstrainedBox(
 	constraints: Constraints,
 	modifier: Modifier = Modifier,
 	content: @Composable () -> Unit = {},
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/BoxTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/BoxTest.kt
@@ -22,10 +22,10 @@ import com.jakewharton.mosaic.layout.size
 import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.modifier.Modifier
 import com.jakewharton.mosaic.position
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.s
 import com.jakewharton.mosaic.size
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.unit.Constraints
 import com.jakewharton.mosaic.ui.unit.IntOffset
 import com.jakewharton.mosaic.ui.unit.IntSize
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/FillerTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/FillerTest.kt
@@ -12,9 +12,9 @@ import com.jakewharton.mosaic.layout.padding
 import com.jakewharton.mosaic.layout.size
 import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.s
 import com.jakewharton.mosaic.size
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.unit.Constraints
 import com.jakewharton.mosaic.ui.unit.IntSize
 import kotlin.test.Test
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/RowColumnModifierTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/RowColumnModifierTest.kt
@@ -12,7 +12,7 @@ import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.layout.wrapContentHeight
 import com.jakewharton.mosaic.layout.wrapContentWidth
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
+import com.jakewharton.mosaic.testing.runMosaicTest
 import kotlin.test.Test
 import kotlinx.coroutines.test.runTest
 
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/RowColumnTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/RowColumnTest.kt
@@ -23,9 +23,9 @@ import com.jakewharton.mosaic.layout.widthIn
 import com.jakewharton.mosaic.layout.wrapContentSize
 import com.jakewharton.mosaic.modifier.Modifier
 import com.jakewharton.mosaic.position
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.size
 import com.jakewharton.mosaic.testIntrinsics
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.unit.Constraints
 import com.jakewharton.mosaic.ui.unit.IntOffset
 import com.jakewharton.mosaic.ui.unit.IntSize
diff --git a/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/SpacerTest.kt b/mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/ui/SpacerTest.kt
@@ -9,9 +9,9 @@ import com.jakewharton.mosaic.layout.height
 import com.jakewharton.mosaic.layout.size
 import com.jakewharton.mosaic.layout.width
 import com.jakewharton.mosaic.modifier.Modifier
-import com.jakewharton.mosaic.runMosaicTest
 import com.jakewharton.mosaic.s
 import com.jakewharton.mosaic.size
+import com.jakewharton.mosaic.testing.runMosaicTest
 import com.jakewharton.mosaic.ui.unit.Constraints
 import com.jakewharton.mosaic.ui.unit.IntSize
 import kotlin.test.Test
diff --git a/mosaic-testing/api/mosaic-testing.api b/mosaic-testing/api/mosaic-testing.api
@@ -0,0 +1,14 @@
+public abstract interface class com/jakewharton/mosaic/testing/SnapshotStrategy {
+	public abstract fun create (Lcom/jakewharton/mosaic/Mosaic;)Ljava/lang/Object;
+}
+
+public abstract interface class com/jakewharton/mosaic/testing/TestMosaic : com/jakewharton/mosaic/Mosaic {
+	public abstract fun awaitSnapshot-VtjQ1oo (JLkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static synthetic fun awaitSnapshot-VtjQ1oo$default (Lcom/jakewharton/mosaic/testing/TestMosaic;JLkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
+}
+
+public final class com/jakewharton/mosaic/testing/TestMosaicKt {
+	public static final fun runMosaicTest (Lcom/jakewharton/mosaic/testing/SnapshotStrategy;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static final fun runMosaicTest (Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+}
+
diff --git a/mosaic-testing/api/mosaic-testing.klib.api b/mosaic-testing/api/mosaic-testing.klib.api
@@ -0,0 +1,21 @@
+// Klib ABI Dump
+// Targets: [linuxArm64, linuxX64, macosArm64, macosX64, mingwX64]
+// Rendering settings:
+// - Signature version: 2
+// - Show manifest properties: true
+// - Show declarations: true
+
+// Library unique name: <com.jakewharton.mosaic:mosaic-testing>
+abstract fun interface <#A: kotlin/Any?> com.jakewharton.mosaic.testing/SnapshotStrategy { // com.jakewharton.mosaic.testing/SnapshotStrategy|null[0]
+    abstract fun create(com.jakewharton.mosaic/Mosaic): #A // com.jakewharton.mosaic.testing/SnapshotStrategy.create|create(com.jakewharton.mosaic.Mosaic){}[0]
+}
+
+abstract interface <#A: kotlin/Any?> com.jakewharton.mosaic.testing/TestMosaic : com.jakewharton.mosaic/Mosaic { // com.jakewharton.mosaic.testing/TestMosaic|null[0]
+    abstract suspend fun awaitSnapshot(kotlin.time/Duration = ...): #A // com.jakewharton.mosaic.testing/TestMosaic.awaitSnapshot|awaitSnapshot(kotlin.time.Duration){}[0]
+}
+
+final val com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop|#static{}com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop[0]
+
+final fun com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter(): kotlin/Int // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter|com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter(){}[0]
+final suspend fun <#A: kotlin/Any?, #B: kotlin/Any?> com.jakewharton.mosaic.testing/runMosaicTest(com.jakewharton.mosaic.testing/SnapshotStrategy<#A>, kotlin.coroutines/SuspendFunction1<com.jakewharton.mosaic.testing/TestMosaic<#A>, #B>): #B // com.jakewharton.mosaic.testing/runMosaicTest|runMosaicTest(com.jakewharton.mosaic.testing.SnapshotStrategy<0:0>;kotlin.coroutines.SuspendFunction1<com.jakewharton.mosaic.testing.TestMosaic<0:0>,0:1>){0§<kotlin.Any?>;1§<kotlin.Any?>}[0]
+final suspend fun com.jakewharton.mosaic.testing/runMosaicTest(kotlin.coroutines/SuspendFunction1<com.jakewharton.mosaic.testing/TestMosaic<kotlin/String>, kotlin/Unit>) // com.jakewharton.mosaic.testing/runMosaicTest|runMosaicTest(kotlin.coroutines.SuspendFunction1<com.jakewharton.mosaic.testing.TestMosaic<kotlin.String>,kotlin.Unit>){}[0]
diff --git a/mosaic-testing/build.gradle b/mosaic-testing/build.gradle
@@ -0,0 +1,21 @@
+apply plugin: 'org.jetbrains.kotlin.multiplatform'
+apply plugin: 'org.jetbrains.kotlin.plugin.compose'
+apply from: "$rootDir/addAllTargets.gradle"
+apply from: "$rootDir/publish.gradle"
+apply plugin: 'dev.drewhamilton.poko'
+
+kotlin {
+	explicitApi()
+
+	sourceSets {
+		commonMain {
+			dependencies {
+				api projects.mosaicRuntime
+				api libs.kotlinx.coroutines.core
+				implementation libs.compose.collection
+			}
+		}
+	}
+
+	compilerOptions.freeCompilerArgs.add('-Xexpect-actual-classes')
+}
diff --git a/mosaic-testing/gradle.properties b/mosaic-testing/gradle.properties
@@ -0,0 +1,2 @@
+POM_ARTIFACT_ID=mosaic-testing
+POM_NAME=Mosaic testing
diff --git a/mosaic-testing/src/commonMain/kotlin/com/jakewharton/mosaic/testing/TestMosaic.kt b/mosaic-testing/src/commonMain/kotlin/com/jakewharton/mosaic/testing/TestMosaic.kt
@@ -1,10 +1,11 @@
-package com.jakewharton.mosaic
+package com.jakewharton.mosaic.testing
 
 import androidx.collection.MutableObjectList
 import androidx.compose.runtime.BroadcastFrameClock
 import androidx.compose.runtime.Composable
+import com.jakewharton.mosaic.Mosaic
+import com.jakewharton.mosaic.TextCanvas
 import com.jakewharton.mosaic.layout.KeyEvent
-import com.jakewharton.mosaic.layout.MosaicNode
 import com.jakewharton.mosaic.ui.AnsiLevel
 import kotlin.coroutines.CoroutineContext
 import kotlin.time.Duration
@@ -13,15 +14,15 @@ import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withTimeout
 
-internal fun interface SnapshotStrategy<T> {
-	fun create(mosaic: Mosaic): T
+public fun interface SnapshotStrategy<T> {
+	public fun create(mosaic: Mosaic): T
 }
 
-internal suspend fun runMosaicTest(block: suspend TestMosaic<String>.() -> Unit) {
+public suspend fun runMosaicTest(block: suspend TestMosaic<String>.() -> Unit) {
 	runMosaicTest(PlainTextSnapshots, block)
 }
 
-internal suspend fun <T, R> runMosaicTest(
+public suspend fun <T, R> runMosaicTest(
 	snapshotStrategy: SnapshotStrategy<T>,
 	block: suspend TestMosaic<T>.() -> R,
 ): R {
@@ -36,8 +37,8 @@ internal suspend fun <T, R> runMosaicTest(
 	}
 }
 
-internal interface TestMosaic<T> : Mosaic {
-	suspend fun awaitSnapshot(duration: Duration = 1.seconds): T
+public interface TestMosaic<T> : Mosaic {
+	public suspend fun awaitSnapshot(duration: Duration = 1.seconds): T
 }
 
 private class RealTestMosaic<T>(
@@ -107,23 +108,3 @@ internal object PlainTextSnapshots : SnapshotStrategy<String> {
 		return mosaic.paint().render(AnsiLevel.NONE)
 	}
 }
-
-internal object DumpSnapshots : SnapshotStrategy<String> {
-	override fun create(mosaic: Mosaic): String {
-		return mosaic.dump()
-	}
-}
-
-internal object NodeSnapshots : SnapshotStrategy<MosaicNode> {
-	override fun create(mosaic: Mosaic): MosaicNode {
-		return (mosaic as MosaicComposition).rootNode
-	}
-}
-
-internal class RenderingSnapshots(
-	private val rendering: Rendering,
-) : SnapshotStrategy<String> {
-	override fun create(mosaic: Mosaic): String {
-		return rendering.render(mosaic).toString()
-	}
-}
diff --git a/samples/counter/build.gradle b/samples/counter/build.gradle
@@ -18,6 +18,14 @@ kotlin {
 				implementation projects.mosaicRuntime
 			}
 		}
+		commonTest {
+			dependencies {
+				implementation projects.mosaicTesting
+				implementation libs.kotlin.test
+				implementation libs.kotlinx.coroutines.test
+				implementation libs.assertk
+			}
+		}
 	}
 
 	targets.withType(KotlinNativeTarget).configureEach { target ->
diff --git a/samples/counter/src/commonTest/kotlin/example/CounterTest.kt b/samples/counter/src/commonTest/kotlin/example/CounterTest.kt
@@ -0,0 +1,21 @@
+package example
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import com.jakewharton.mosaic.testing.runMosaicTest
+import kotlin.test.Test
+import kotlinx.coroutines.test.runTest
+
+class CounterTest {
+	@Test
+	fun counter() = runTest {
+		runMosaicTest {
+			setContent {
+				Counter()
+			}
+			for (count in 0..20) {
+				assertThat(awaitSnapshot()).isEqualTo("The count is: $count")
+			}
+		}
+	}
+}
diff --git a/settings.gradle b/settings.gradle
@@ -19,6 +19,7 @@ rootProject.name = 'mosaic'
 include ':mosaic-animation'
 include ':mosaic-runtime'
 include ':mosaic-terminal'
+include ':mosaic-testing'
 
 include ':samples:counter'
 include ':samples:demo'

Original file line number	Diff line number	Diff line change
`@@ -31,6 +31,7 @@ kotlin {`
`31`	`31`	`}`
`32`	`32`	`commonTest {`
`33`	`33`	`dependencies {`
	`34`	`+ implementation projects.mosaicTesting`
`34`	`35`	`implementation libs.kotlin.test`
`35`	`36`	`implementation libs.kotlinx.coroutines.test`
`36`	`37`	`implementation libs.assertk`