Merge pull request #2192 from CruGlobal/robolectricComposeWorkaround

Add a robolectric Compose workaround

gradle.properties

@@ -4,6 +4,7 @@ org.gradle.caching=true
 org.gradle.jvmargs=-Xmx4g
 org.gradle.parallel=true
 
+android.experimental.enableTestFixturesKotlinSupport=true
 android.nonTransitiveRClass=true
 android.useAndroidX=true
 

gto-support-androidx-compose/build.gradle.kts

@@ -5,6 +5,7 @@ plugins {
 android {
     namespace = "org.ccci.gto.android.common.androidx.compose"
     configureCompose(project)
+    testFixtures.enable = true
 }
 
 dependencies {
@@ -14,4 +15,8 @@ dependencies {
     // region Linkify support
     implementation(libs.androidx.core)
     // endregion Linkify support
+
+    testFixturesImplementation(kotlin("test"))
+    testFixturesImplementation(libs.androidx.compose.ui)
+    testFixturesImplementation(libs.kotlin.coroutines)
 }

gto-support-androidx-compose/src/testFixtures/java/org/ccci/gto/android/common/androidx/compose/ui/platform/AndroidUiDispatcherUtil.java

@@ -0,0 +1,11 @@
+package org.ccci.gto.android.common.androidx.compose.ui.platform;
+
+public class AndroidUiDispatcherUtil {
+    /**
+     * This method is provided to workaround a bug with Kotlin Test Fixtures not being accessible via an external aar
+     * dependency.
+     */
+    public static void runScheduledDispatches() {
+        AndroidUiDispatcher_TestFixturesKt.clearAndroidUiDispatcher();
+    }
+}

gto-support-androidx-compose/src/testFixtures/kotlin/org/ccci/gto/android/common/androidx/compose/ui/platform/AndroidUiDispatcher+TestFixtures.kt

@@ -0,0 +1,34 @@
+package org.ccci.gto.android.common.androidx.compose.ui.platform
+
+import androidx.compose.ui.platform.AndroidUiDispatcher
+import kotlin.test.assertFalse
+import kotlinx.coroutines.CoroutineDispatcher
+
+// HACK: Workaround for https://github.com/robolectric/robolectric/issues/7055#issuecomment-1551119229
+@OptIn(ExperimentalStdlibApi::class)
+fun clearAndroidUiDispatcher() {
+    val androidUiDispatcher = AndroidUiDispatcher.Main[CoroutineDispatcher.Key] as AndroidUiDispatcher
+
+    val dispatchCallback by lazy {
+        androidUiDispatcher.javaClass.getDeclaredField("dispatchCallback")
+            .apply { isAccessible = true }
+            .get(androidUiDispatcher) as Runnable
+    }
+
+    var scheduledFrameDispatch = false
+    var scheduledTrampolineDispatch = false
+    for (i in 0 until 5) {
+        scheduledFrameDispatch = androidUiDispatcher.javaClass.getDeclaredField("scheduledFrameDispatch")
+            .apply { isAccessible = true }
+            .getBoolean(androidUiDispatcher)
+        scheduledTrampolineDispatch = androidUiDispatcher.javaClass.getDeclaredField("scheduledTrampolineDispatch")
+            .apply { isAccessible = true }
+            .getBoolean(androidUiDispatcher)
+        if (!scheduledFrameDispatch && !scheduledTrampolineDispatch) break
+
+        dispatchCallback.run()
+    }
+
+    assertFalse(scheduledFrameDispatch)
+    assertFalse(scheduledTrampolineDispatch)
+}