Add snapshot test

test/stores/RoomViewStore-test.ts

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { Room } from "matrix-js-sdk/src/matrix";
+import { MatrixError, Room } from "matrix-js-sdk/src/matrix";
 import { sleep } from "matrix-js-sdk/src/utils";
 
 import { RoomViewStore } from "../../src/stores/RoomViewStore";
@@ -284,6 +284,19 @@ describe("RoomViewStore", function () {
         await viewCall();
     });
 
+    it("should display an error message when the room is unreachable via the roomId", async () => {
+        // When
+        // View and wait for the room
+        dis.dispatch({ action: Action.ViewRoom, room_id: roomId });
+        await untilDispatch(Action.ActiveRoomChanged, dis);
+        // Generate error to display the expected error message
+        const error = new MatrixError(undefined, 404);
+        roomViewStore.showJoinRoomError(error, roomId);
+
+        // Then
+        expect(Modal.createDialog).toMatchSnapshot();
+    });
+
     describe("when listening to a voice broadcast", () => {
         let voiceBroadcastPlayback: VoiceBroadcastPlayback;
 

test/stores/__snapshots__/RoomViewStore-test.ts.snap

@@ -1,5 +1,30 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`RoomViewStore should display an error message when the room is unreachable via the roomId 1`] = `
+[MockFunction] {
+  "calls": [
+    [
+      [Function],
+      {
+        "description": <div>
+          You attempted to join using a room ID without providing a list of servers to join through. Room IDs are internal identifiers and cannot be used to join a room without additional information.
+          <br />
+          <br />
+          If you know a room address, try joining through that instead.
+        </div>,
+        "title": "Failed to join",
+      },
+    ],
+  ],
+  "results": [
+    {
+      "type": "return",
+      "value": undefined,
+    },
+  ],
+}
+`;
+
 exports[`RoomViewStore when recording a voice broadcast and trying to view a call, it should not actually view it and show the info dialog 1`] = `
 [MockFunction] {
   "calls": [