Re-key all |zero-pluralised translations for Localazy compatibility (#11417)

* Re-key all |zero-pluralised translations for Localazy compatibility

* Add missing interpolation variable

* i18n

* Add test coverage

* Improve coverage

test/utils/i18n-helpers-test.ts

@@ -0,0 +1,62 @@
+/*
+Copyright 2023 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 { Room } from "matrix-js-sdk/src/matrix";
+import { mocked } from "jest-mock";
+
+import SpaceStore from "../../src/stores/spaces/SpaceStore";
+import { stubClient } from "../test-utils";
+import { roomContextDetails } from "../../src/utils/i18n-helpers";
+import DMRoomMap from "../../src/utils/DMRoomMap";
+
+describe("roomContextDetails", () => {
+    const client = stubClient();
+    DMRoomMap.makeShared(client);
+
+    const room = new Room("!room:server", client, client.getSafeUserId());
+    const parent1 = new Room("!parent1:server", client, client.getSafeUserId());
+    parent1.name = "Alpha";
+    const parent2 = new Room("!parent2:server", client, client.getSafeUserId());
+    parent2.name = "Beta";
+    const parent3 = new Room("!parent3:server", client, client.getSafeUserId());
+    parent3.name = "Charlie";
+    mocked(client.getRoom).mockImplementation((roomId) => {
+        return [parent1, parent2, parent3].find((r) => r.roomId === roomId) ?? null;
+    });
+
+    it("should return 1-parent variant", () => {
+        jest.spyOn(SpaceStore.instance, "getKnownParents").mockReturnValue(new Set([parent1.roomId]));
+        const res = roomContextDetails(room);
+        expect(res!.details).toMatchInlineSnapshot(`"Alpha"`);
+        expect(res!.ariaLabel).toMatchInlineSnapshot(`"In Alpha."`);
+    });
+
+    it("should return 2-parent variant", () => {
+        jest.spyOn(SpaceStore.instance, "getKnownParents").mockReturnValue(new Set([parent2.roomId, parent3.roomId]));
+        const res = roomContextDetails(room);
+        expect(res!.details).toMatchInlineSnapshot(`"Beta and Charlie"`);
+        expect(res!.ariaLabel).toMatchInlineSnapshot(`"In spaces Beta and Charlie."`);
+    });
+
+    it("should return n-parent variant", () => {
+        jest.spyOn(SpaceStore.instance, "getKnownParents").mockReturnValue(
+            new Set([parent1.roomId, parent2.roomId, parent3.roomId]),
+        );
+        const res = roomContextDetails(room);
+        expect(res!.details).toMatchInlineSnapshot(`"Alpha and 1 other"`);
+        expect(res!.ariaLabel).toMatchInlineSnapshot(`"In Alpha and 1 other space."`);
+    });
+});