[Client] Add more tests

lib/src/Client.dart

@@ -255,7 +255,7 @@ class Client {
   }
 
   /// This endpoint allows the creation, modification and deletion of pushers for this user ID.
-  Future setPushers(SetPushersRequest data) async {
+  Future<dynamic> setPushers(SetPushersRequest data) async {
     final dynamic resp = await connection.jsonRequest(
       type: HTTPType.POST,
       action: "/client/r0/pushers/set",
@@ -264,9 +264,8 @@ class Client {
 
     if (resp is ErrorResponse) {
       connection.onError.add(resp);
-      return null;
     }
 
-    return null;
+    return resp;
   }
 }

test/Client_test.dart

@@ -26,6 +26,7 @@ import 'dart:async';
 import 'package:famedlysdk/src/Client.dart';
 import 'package:famedlysdk/src/Connection.dart';
 import 'package:famedlysdk/src/User.dart';
+import 'package:famedlysdk/src/requests/SetPushersRequest.dart';
 import 'package:famedlysdk/src/responses/ErrorResponse.dart';
 import 'package:famedlysdk/src/responses/PushrulesResponse.dart';
 import 'package:famedlysdk/src/sync/EventUpdate.dart';
@@ -248,6 +249,25 @@ void main() {
       expect(pushrules.toJson(), awaited_resp.toJson());
     });
 
+    test('setPushers', () async {
+      final SetPushersRequest data = SetPushersRequest(
+          app_id: "com.famedly.famedlysdk",
+          device_display_name: "GitLabCi",
+          app_display_name: "famedlySDK",
+          pushkey: "abcdefg",
+          lang: "en",
+          data: PusherData(
+              format: "event_id_only", url: "https://examplepushserver.com"));
+      final dynamic resp = await matrix.setPushers(data);
+      expect(resp is ErrorResponse, false);
+    });
+
+    test('joinRoomById', () async {
+      final String roomID = "1234";
+      final Map<String, dynamic> resp = await matrix.joinRoomById(roomID);
+      expect(resp["room_id"], roomID);
+    });
+
     test('Logout when token is unknown', () async {
       Future<LoginState> loginStateFuture =
           matrix.connection.onLoginStateChanged.stream.first;

test/FakeMatrixApi.dart

@@ -451,6 +451,8 @@ class FakeMatrixApi extends MockClient {
             "device_id": "GHTYAJCE"
           },
       "/client/r0/logout": (var reqI) => {},
+      "/client/r0/pushers/set": (var reqI) => {},
+      "/client/r0/join/1234": (var reqI) => {"room_id": "1234"},
       "/client/r0/logout/all": (var reqI) => {},
       "/client/r0/createRoom": (var reqI) => {
             "room_id": "!1234:fakeServer.notExisting",