Add tests on LiveMediaTimeline

libraries/mediaviewer/impl/src/test/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/LiveMediaTimelineTest.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.mediaviewer.impl.gallery
+
+import com.google.common.truth.Truth.assertThat
+import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.test.room.FakeMatrixRoom
+import io.element.android.libraries.matrix.test.timeline.FakeTimeline
+import io.element.android.tests.testutils.lambda.lambdaRecorder
+import io.element.android.tests.testutils.lambda.value
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+class LiveMediaTimelineTest {
+    @Test
+    fun `LiveMediaTimeline cache is always null`() = runTest {
+        val sut = createLiveMediaTimeline()
+        assertThat<GroupedMediaItems?>(sut.cache).isNull()
+    }
+
+    @Test
+    fun `getTimeline returns the timeline provided by the room, then from cache`() = runTest {
+        val mediaTimelineResult = lambdaRecorder<EventId?, Result<Timeline>> {
+            Result.success(FakeTimeline())
+        }
+        val room = FakeMatrixRoom(
+            mediaTimelineResult = mediaTimelineResult,
+        )
+        val sut = createLiveMediaTimeline(
+            room = room,
+        )
+        val timeline = sut.getTimeline()
+        assertThat(timeline.isSuccess).isTrue()
+        mediaTimelineResult.assertions().isCalledOnce().with(value(null))
+        val timeline2 = sut.getTimeline()
+        assertThat(timeline2.isSuccess).isTrue()
+        // No called another time
+        mediaTimelineResult.assertions().isCalledOnce()
+    }
+
+    private fun createLiveMediaTimeline(
+        room: MatrixRoom = FakeMatrixRoom(),
+    ) = LiveMediaTimeline(
+        room = room,
+    )
+}