Apply strictNullChecks to src/utils/*!exportUtils (#10455

* Apply `strictNullChecks` to `src/utils/exportUtils`

* strict fix

* fix strictNullChecks issues in some utils

* fix error message

* test coverage

* lint

* more strictNullChecks

* small optimisation for getUniqueRoomsWithIndividuals

* tidy

* test coverage

test/utils/DMRoomMap-test.ts

@@ -16,7 +16,7 @@ limitations under the License.
 
 import { mocked, Mocked } from "jest-mock";
 import { logger } from "matrix-js-sdk/src/logger";
-import { ClientEvent, EventType, IContent, MatrixClient, MatrixEvent } from "matrix-js-sdk/src/matrix";
+import { ClientEvent, EventType, IContent, MatrixClient, MatrixEvent, Room } from "matrix-js-sdk/src/matrix";
 
 import DMRoomMap from "../../src/utils/DMRoomMap";
 import { mkEvent, stubClient } from "../test-utils";
@@ -137,4 +137,56 @@ describe("DMRoomMap", () => {
             expect(dmRoomMap.getRoomIds()).toEqual(new Set([roomId1, roomId2, roomId4]));
         });
     });
+
+    describe("getUniqueRoomsWithIndividuals()", () => {
+        const bigRoom = {
+            roomId: "!bigRoom:server.org",
+            getInvitedAndJoinedMemberCount: jest.fn().mockReturnValue(5000),
+        } as unknown as Room;
+        const dmWithBob = {
+            roomId: "!dmWithBob:server.org",
+            getInvitedAndJoinedMemberCount: jest.fn().mockReturnValue(2),
+        } as unknown as Room;
+        const dmWithCharlie = {
+            roomId: "!dmWithCharlie:server.org",
+            getInvitedAndJoinedMemberCount: jest.fn().mockReturnValue(2),
+        } as unknown as Room;
+        const smallRoom = {
+            roomId: "!smallRoom:server.org",
+            getInvitedAndJoinedMemberCount: jest.fn().mockReturnValue(3),
+        } as unknown as Room;
+
+        const mDirectContent = {
+            "@bob:server.org": [bigRoom.roomId, dmWithBob.roomId, smallRoom.roomId],
+            "@charlie:server.org": [dmWithCharlie.roomId, smallRoom.roomId],
+        };
+
+        beforeEach(() => {
+            client.getAccountData.mockReturnValue(mkMDirectEvent(mDirectContent));
+            client.getRoom.mockImplementation((roomId: string) =>
+                [bigRoom, smallRoom, dmWithCharlie, dmWithBob].find((room) => room.roomId === roomId),
+            );
+        });
+
+        it("returns an empty object when room map has not been populated", () => {
+            const instance = new DMRoomMap(client);
+            expect(instance.getUniqueRoomsWithIndividuals()).toEqual({});
+        });
+
+        it("returns map of users to rooms with 2 members", () => {
+            const dmRoomMap = new DMRoomMap(client);
+            dmRoomMap.start();
+            expect(dmRoomMap.getUniqueRoomsWithIndividuals()).toEqual({
+                "@bob:server.org": dmWithBob,
+                "@charlie:server.org": dmWithCharlie,
+            });
+        });
+
+        it("excludes rooms that are not found by matrixClient", () => {
+            client.getRoom.mockReset().mockReturnValue(undefined);
+            const dmRoomMap = new DMRoomMap(client);
+            dmRoomMap.start();
+            expect(dmRoomMap.getUniqueRoomsWithIndividuals()).toEqual({});
+        });
+    });
 });

test/utils/location/map-test.ts

@@ -31,15 +31,23 @@ describe("createMapSiteLinkFromEvent", () => {
         ).toBeNull();
     });
 
-    it("returns OpenStreetMap link if event contains m.location", () => {
+    it("returns OpenStreetMap link if event contains m.location with valid uri", () => {
         expect(createMapSiteLinkFromEvent(makeLocationEvent("geo:51.5076,-0.1276"))).toEqual(
             "https://www.openstreetmap.org/" + "?mlat=51.5076&mlon=-0.1276" + "#map=16/51.5076/-0.1276",
         );
     });
 
+    it("returns null if event contains m.location with invalid uri", () => {
+        expect(createMapSiteLinkFromEvent(makeLocationEvent("123 Sesame St"))).toBeNull();
+    });
+
     it("returns OpenStreetMap link if event contains geo_uri", () => {
         expect(createMapSiteLinkFromEvent(makeLegacyLocationEvent("geo:51.5076,-0.1276"))).toEqual(
             "https://www.openstreetmap.org/" + "?mlat=51.5076&mlon=-0.1276" + "#map=16/51.5076/-0.1276",
         );
     });
+
+    it("returns null if event contains an invalid geo_uri", () => {
+        expect(createMapSiteLinkFromEvent(makeLegacyLocationEvent("123 Sesame St"))).toBeNull();
+    });
 });

test/utils/location/parseGeoUri-test.ts

@@ -21,6 +21,14 @@ describe("parseGeoUri", () => {
         expect(parseGeoUri("")).toBeFalsy();
     });
 
+    it("returns undefined if latitude is not a number", () => {
+        expect(parseGeoUri("geo:ABCD,16.3695,183")).toBeUndefined();
+    });
+
+    it("returns undefined if longitude is not a number", () => {
+        expect(parseGeoUri("geo:48.2010,EFGH,183")).toBeUndefined();
+    });
+
     // We use some examples from the spec, but don't check semantics
     // like two textually-different URIs being equal, since we are
     // just a humble parser.