Implement broadcast message preview (#9762)

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

@@ -0,0 +1,96 @@
+/*
+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 { RelationType } from "matrix-js-sdk/src/matrix";
+
+import { MessageEventPreview } from "../../../../src/stores/room-list/previews/MessageEventPreview";
+import { mkEvent, stubClient } from "../../../test-utils";
+
+describe("MessageEventPreview", () => {
+    const preview = new MessageEventPreview();
+    const userId = "@user:example.com";
+
+    beforeAll(() => {
+        stubClient();
+    });
+
+    describe("getTextFor", () => {
+        it("when called with an event with empty content should return null", () => {
+            const event = mkEvent({
+                event: true,
+                content: {},
+                user: userId,
+                type: "m.room.message",
+            });
+            expect(preview.getTextFor(event)).toBeNull();
+        });
+
+        it("when called with an event with empty body should return null", () => {
+            const event = mkEvent({
+                event: true,
+                content: {
+                    body: "",
+                },
+                user: userId,
+                type: "m.room.message",
+            });
+            expect(preview.getTextFor(event)).toBeNull();
+        });
+
+        it("when called with an event with body should return »user: body«", () => {
+            const event = mkEvent({
+                event: true,
+                content: {
+                    body: "test body",
+                },
+                user: userId,
+                type: "m.room.message",
+            });
+            expect(preview.getTextFor(event)).toBe(`${userId}: test body`);
+        });
+
+        it("when called for a replaced event with new content should return the new content body", () => {
+            const event = mkEvent({
+                event: true,
+                content: {
+                    ["m.new_content"]: {
+                        body: "test new content body",
+                    },
+                    ["m.relates_to"]: {
+                        rel_type: RelationType.Replace,
+                        event_id: "$asd123",
+                    },
+                },
+                user: userId,
+                type: "m.room.message",
+            });
+            expect(preview.getTextFor(event)).toBe(`${userId}: test new content body`);
+        });
+
+        it("when called with a broadcast chunk event it should return null", () => {
+            const event = mkEvent({
+                event: true,
+                content: {
+                    body: "test body",
+                    ["io.element.voice_broadcast_chunk"]: {},
+                },
+                user: userId,
+                type: "m.room.message",
+            });
+            expect(preview.getTextFor(event)).toBeNull();
+        });
+    });
+});