Let notifications use avatar fallback.

Extract code which handles Matrix image to its own api / impl / test modules.

libraries/matrixmedia/test/build.gradle.kts

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.matrix.ui.media.test"
+}
+
+dependencies {
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.matrixmedia.api)
+    implementation(projects.libraries.designsystem)
+    implementation(projects.tests.testutils)
+    implementation(libs.coil.compose)
+}

libraries/matrixmedia/test/src/main/kotlin/io/element/android/libraries/matrix/ui/test/media/FakeImageLoader.kt

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+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ * 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.matrix.ui.test.media
+
+import coil3.ComponentRegistry
+import coil3.ImageLoader
+import coil3.disk.DiskCache
+import coil3.memory.MemoryCache
+import coil3.request.Disposable
+import coil3.request.ImageRequest
+import coil3.request.ImageResult
+
+class FakeImageLoader : ImageLoader {
+    private val executedRequests = mutableListOf<ImageRequest>()
+
+    override val defaults: ImageRequest.Defaults
+        get() = error("Not implemented")
+    override val components: ComponentRegistry
+        get() = error("Not implemented")
+    override val memoryCache: MemoryCache?
+        get() = error("Not implemented")
+    override val diskCache: DiskCache?
+        get() = error("Not implemented")
+
+    override fun enqueue(request: ImageRequest): Disposable {
+        error("Not implemented")
+    }
+
+    override suspend fun execute(request: ImageRequest): ImageResult {
+        executedRequests.add(request)
+        error("Not implemented")
+    }
+
+    override fun shutdown() {
+        error("Not implemented")
+    }
+
+    override fun newBuilder(): ImageLoader.Builder {
+        error("Not implemented")
+    }
+
+    fun getExecutedRequestsData(): List<Any> {
+        return executedRequests.map { it.data }
+    }
+}

libraries/matrixmedia/test/src/main/kotlin/io/element/android/libraries/matrix/ui/test/media/FakeImageLoaderHolder.kt

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+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ * 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.matrix.ui.test.media
+
+import coil3.ImageLoader
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.matrix.ui.media.ImageLoaderHolder
+
+class FakeImageLoaderHolder(
+    val fakeImageLoader: ImageLoader = FakeImageLoader(),
+) : ImageLoaderHolder {
+    override fun get(): ImageLoader {
+        return fakeImageLoader
+    }
+
+    override fun get(client: MatrixClient): ImageLoader {
+        return fakeImageLoader
+    }
+
+    override fun remove(sessionId: SessionId) {
+        // No-op
+    }
+}

libraries/matrixmedia/test/src/main/kotlin/io/element/android/libraries/matrix/ui/test/media/FakeInitialsAvatarBitmapGenerator.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Element Creations 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.matrix.ui.test.media
+
+import coil3.Bitmap
+import io.element.android.libraries.designsystem.components.avatar.AvatarData
+import io.element.android.libraries.matrix.ui.media.InitialsAvatarBitmapGenerator
+import io.element.android.tests.testutils.lambda.lambdaError
+
+class FakeInitialsAvatarBitmapGenerator(
+    private val generateBitmapResult: (Int, AvatarData, Boolean, Float) -> Bitmap? = { _, _, _, _ -> lambdaError() }
+) : InitialsAvatarBitmapGenerator {
+    override fun generateBitmap(
+        size: Int,
+        avatarData: AvatarData,
+        useDarkTheme: Boolean,
+        fontSizePercentage: Float,
+    ): Bitmap? {
+        return generateBitmapResult(size, avatarData, useDarkTheme, fontSizePercentage)
+    }
+}