Cover composer attachment announcer's type-resolution branches

Extract `announceAddedAttachment` to `internal` (annotated `@VisibleForTesting`)
and add a JVM unit test exercising the image / video / audio recording / file /
null branches.

Author: andremion

stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/components/composer/MessageComposerAttachmentAnnouncer.kt

@@ -16,6 +16,7 @@
 
 package io.getstream.chat.android.compose.ui.components.composer
 
+import androidx.annotation.VisibleForTesting
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -68,7 +69,8 @@ internal fun MessageComposerAttachmentAnnouncer(attachments: List<Attachment>) {
     }
 }
 
-private fun announceAddedAttachment(
+@VisibleForTesting
+internal fun announceAddedAttachment(
     added: Attachment?,
     photoAttached: String,
     videoAttached: String,

stream-chat-android-compose/src/test/kotlin/io/getstream/chat/android/compose/ui/components/composer/AnnounceAddedAttachmentTest.kt

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2014-2026 Stream.io Inc. All rights reserved.
+ *
+ * Licensed under the Stream License;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    https://github.com/GetStream/stream-chat-android/blob/main/LICENSE
+ *
+ * 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.getstream.chat.android.compose.ui.components.composer
+
+import io.getstream.chat.android.models.AttachmentType
+import io.getstream.chat.android.randomAttachment
+import io.getstream.chat.android.randomString
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+internal class AnnounceAddedAttachmentTest {
+
+    private val photoAttached = randomString()
+    private val videoAttached = randomString()
+    private val audioAttached = randomString()
+    private val fileAttached = randomString()
+
+    @Test
+    fun `returns empty string when attachment is null`() {
+        val result = announceAddedAttachment(
+            added = null,
+            photoAttached = photoAttached,
+            videoAttached = videoAttached,
+            audioAttached = audioAttached,
+            fileAttached = fileAttached,
+        )
+
+        assertEquals("", result)
+    }
+
+    @Test
+    fun `returns photoAttached label for an image attachment`() {
+        val result = announceAddedAttachment(
+            added = randomAttachment(type = AttachmentType.IMAGE),
+            photoAttached = photoAttached,
+            videoAttached = videoAttached,
+            audioAttached = audioAttached,
+            fileAttached = fileAttached,
+        )
+
+        assertEquals(photoAttached, result)
+    }
+
+    @Test
+    fun `returns videoAttached label for a video attachment`() {
+        val result = announceAddedAttachment(
+            added = randomAttachment(type = AttachmentType.VIDEO),
+            photoAttached = photoAttached,
+            videoAttached = videoAttached,
+            audioAttached = audioAttached,
+            fileAttached = fileAttached,
+        )
+
+        assertEquals(videoAttached, result)
+    }
+
+    @Test
+    fun `returns audioAttached label for an audio recording attachment`() {
+        val result = announceAddedAttachment(
+            added = randomAttachment(type = AttachmentType.AUDIO_RECORDING),
+            photoAttached = photoAttached,
+            videoAttached = videoAttached,
+            audioAttached = audioAttached,
+            fileAttached = fileAttached,
+        )
+
+        assertEquals(audioAttached, result)
+    }
+
+    @Test
+    fun `returns fileAttached label for any other attachment type`() {
+        val result = announceAddedAttachment(
+            added = randomAttachment(type = AttachmentType.FILE),
+            photoAttached = photoAttached,
+            videoAttached = videoAttached,
+            audioAttached = audioAttached,
+            fileAttached = fileAttached,
+        )
+
+        assertEquals(fileAttached, result)
+    }
+}