Add Ui test on CallScreenView

features/call/impl/build.gradle.kts

@@ -70,4 +70,6 @@ dependencies {
     testImplementation(projects.libraries.push.test)
     testImplementation(projects.services.analytics.test)
     testImplementation(projects.tests.testutils)
+    testImplementation(libs.androidx.compose.ui.test.junit)
+    testReleaseImplementation(libs.androidx.compose.ui.test.manifest)
 }

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallScreenStateProvider.kt

@@ -28,7 +28,7 @@ open class CallScreenStateProvider : PreviewParameterProvider<CallScreenState> {
         )
 }
 
-private fun aCallScreenState(
+internal fun aCallScreenState(
     urlState: AsyncData<String> = AsyncData.Success("https://call.element.io/some-actual-call?with=parameters"),
     userAgent: String = "",
     isInWidgetMode: Boolean = false,

features/call/impl/src/test/kotlin/io/element/android/features/call/impl/ui/CallScreenViewTest.kt

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.features.call.impl.ui
+
+import androidx.activity.ComponentActivity
+import androidx.compose.ui.test.junit4.AndroidComposeTestRule
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import io.element.android.features.call.impl.pip.PictureInPictureEvents
+import io.element.android.features.call.impl.pip.PictureInPictureState
+import io.element.android.features.call.impl.pip.aPictureInPictureState
+import io.element.android.tests.testutils.EventsRecorder
+import io.element.android.tests.testutils.pressBack
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TestRule
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class CallScreenViewTest {
+    @get:Rule val rule = createAndroidComposeRule<ComponentActivity>()
+
+    @Test
+    fun `clicking on back when pip is not supported hangs up`() {
+        val eventsRecorder = EventsRecorder<CallScreenEvents>()
+        val pipEventsRecorder = EventsRecorder<PictureInPictureEvents>(expectEvents = false)
+        rule.setCallScreenView(
+            aCallScreenState(
+                eventSink = eventsRecorder
+            ),
+            aPictureInPictureState(
+                supportPip = false,
+                eventSink = pipEventsRecorder,
+            ),
+        )
+        rule.pressBack()
+        eventsRecorder.assertSize(2)
+        eventsRecorder.assertTrue(0) { it is CallScreenEvents.SetupMessageChannels }
+        eventsRecorder.assertTrue(1) { it == CallScreenEvents.Hangup }
+    }
+
+    @Test
+    fun `clicking on back when pip is supported enables PiP`() {
+        val eventsRecorder = EventsRecorder<CallScreenEvents>()
+        val pipEventsRecorder = EventsRecorder<PictureInPictureEvents>()
+        rule.setCallScreenView(
+            aCallScreenState(
+                eventSink = eventsRecorder
+            ),
+            aPictureInPictureState(
+                supportPip = true,
+                eventSink = pipEventsRecorder,
+            ),
+        )
+        rule.pressBack()
+        eventsRecorder.assertSize(1)
+        eventsRecorder.assertTrue(0) { it is CallScreenEvents.SetupMessageChannels }
+        pipEventsRecorder.assertSingle(PictureInPictureEvents.EnterPictureInPicture)
+    }
+}
+
+private fun <R : TestRule> AndroidComposeTestRule<R, ComponentActivity>.setCallScreenView(
+    state: CallScreenState,
+    pipState: PictureInPictureState,
+    requestPermissions: (Array<String>, RequestPermissionCallback) -> Unit = { _, _ -> },
+) {
+    setContent {
+        CallScreenView(
+            state = state,
+            pipState = pipState,
+            requestPermissions = requestPermissions,
+        )
+    }
+}

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/EventsRecorder.kt

@@ -42,4 +42,12 @@ class EventsRecorder<T>(
     fun assertList(expectedEvents: List<T>) {
         assertThat(events).isEqualTo(expectedEvents)
     }
+
+    fun assertSize(size: Int) {
+        assertThat(events.size).isEqualTo(size)
+    }
+
+    fun assertTrue(index: Int, predicate: (T) -> Boolean) {
+        assertThat((predicate(events[index]))).isTrue()
+    }
 }