Implement broadcast message preview (#9762)

test/stores/room-list/previews/VoiceBroadcastPreview-test.ts

@@ -0,0 +1,57 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import { VoiceBroadcastPreview } from "../../../../src/stores/room-list/previews/VoiceBroadcastPreview";
+import { VoiceBroadcastInfoState } from "../../../../src/voice-broadcast";
+import { mkEvent } from "../../../test-utils";
+import { mkVoiceBroadcastInfoStateEvent } from "../../../voice-broadcast/utils/test-utils";
+
+describe("VoiceBroadcastPreview.getTextFor", () => {
+    const roomId = "!room:example.com";
+    const userId = "@user:example.com";
+    const deviceId = "d42";
+    let preview: VoiceBroadcastPreview;
+
+    beforeAll(() => {
+        preview = new VoiceBroadcastPreview();
+    });
+
+    it("when passing an event with empty content, it should return null", () => {
+        const event = mkEvent({
+            event: true,
+            content: {},
+            user: userId,
+            type: "m.room.message",
+        });
+        expect(preview.getTextFor(event)).toBeNull();
+    });
+
+    it("when passing a broadcast started event, it should return null", () => {
+        const event = mkVoiceBroadcastInfoStateEvent(roomId, VoiceBroadcastInfoState.Started, userId, deviceId);
+        expect(preview.getTextFor(event)).toBeNull();
+    });
+
+    it("when passing a broadcast stopped event, it should return the expected text", () => {
+        const event = mkVoiceBroadcastInfoStateEvent(roomId, VoiceBroadcastInfoState.Stopped, userId, deviceId);
+        expect(preview.getTextFor(event)).toBe("@user:example.com ended a voice broadcast");
+    });
+
+    it("when passing a redacted broadcast stopped event, it should return null", () => {
+        const event = mkVoiceBroadcastInfoStateEvent(roomId, VoiceBroadcastInfoState.Stopped, userId, deviceId);
+        event.makeRedacted(mkEvent({ event: true, content: {}, user: userId, type: "m.room.redaction" }));
+        expect(preview.getTextFor(event)).toBeNull();
+    });
+});