Timeline test: check timeline is initialized and disposed

features/messages/src/test/kotlin/io/element/android/features/messages/timeline/Test.kt

@@ -1,31 +0,0 @@
-/*
- * Copyright (c) 2023 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
- *
- *     http://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.
- */
-
-@file:OptIn(ExperimentalCoroutinesApi::class)
-
-package io.element.android.features.messages.timeline
-
-import io.element.android.libraries.core.coroutine.CoroutineDispatchers
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.test.UnconfinedTestDispatcher
-
-// TODO Move to common module to reuse
-fun testCoroutineDispatchers() = CoroutineDispatchers(
-    io = UnconfinedTestDispatcher(),
-    computation = UnconfinedTestDispatcher(),
-    main = UnconfinedTestDispatcher(),
-    diffUpdateDispatcher = UnconfinedTestDispatcher(),
-)

features/messages/src/test/kotlin/io/element/android/features/messages/timeline/TimelinePresenterTest.kt

@@ -48,12 +48,27 @@ class TimelinePresenterTest {
     }
 
     @Test
-    fun `present - load more`() = runTest {
-        val matrixTimeline = FakeMatrixTimeline()
-        val matrixRoom = FakeMatrixRoom(matrixTimeline = matrixTimeline)
+    fun `present - makes sure timeline is initialized and disposed`() = runTest {
+        val fakeTimeline = FakeMatrixTimeline()
         val presenter = TimelinePresenter(
             timelineItemsFactory = aTimelineItemsFactory(),
-            room = matrixRoom,
+            room = FakeMatrixRoom(matrixTimeline = fakeTimeline),
+        )
+        assertThat(fakeTimeline.isInitialized).isFalse()
+        moleculeFlow(RecompositionClock.Immediate) {
+            presenter.present()
+        }.test {
+            skipItems(2)
+            assertThat(fakeTimeline.isInitialized).isTrue()
+        }
+        assertThat(fakeTimeline.isInitialized).isFalse()
+    }
+
+    @Test
+    fun `present - load more`() = runTest {
+        val presenter = TimelinePresenter(
+            timelineItemsFactory = aTimelineItemsFactory(),
+            room = FakeMatrixRoom(),
         )
         moleculeFlow(RecompositionClock.Immediate) {
             presenter.present()
@@ -73,11 +88,9 @@ class TimelinePresenterTest {
 
     @Test
     fun `present - set highlighted event`() = runTest {
-        val matrixTimeline = FakeMatrixTimeline()
-        val matrixRoom = FakeMatrixRoom(matrixTimeline = matrixTimeline)
         val presenter = TimelinePresenter(
             timelineItemsFactory = aTimelineItemsFactory(),
-            room = matrixRoom,
+            room = FakeMatrixRoom(),
         )
         moleculeFlow(RecompositionClock.Immediate) {
             presenter.present()

libraries/matrixtest/src/main/kotlin/io/element/android/libraries/matrixtest/timeline/FakeMatrixTimeline.kt

@@ -31,6 +31,7 @@ class FakeMatrixTimeline(
 
     private val paginationState: MutableStateFlow<MatrixTimeline.PaginationState> = MutableStateFlow(initialPaginationState)
     private val timelineItems: MutableStateFlow<List<MatrixTimelineItem>> = MutableStateFlow(initialTimelineItems)
+    var isInitialized = false
 
     fun updatePaginationState(update: (MatrixTimeline.PaginationState.() -> MatrixTimeline.PaginationState)) {
         paginationState.value = update(paginationState.value)
@@ -62,9 +63,13 @@ class FakeMatrixTimeline(
         return Result.success(Unit)
     }
 
-    override fun initialize() = Unit
+    override fun initialize() {
+        isInitialized = true
+    }
 
-    override fun dispose() = Unit
+    override fun dispose() {
+        isInitialized = false
+    }
 
     override suspend fun sendMessage(message: String): Result<Unit> {
         return Result.success(Unit)