test: add deeplink tests

Author: LucasXu0

frontend/appflowy_flutter/lib/workspace/presentation/home/menu/sidebar/workspace/sidebar_workspace.dart

@@ -194,6 +194,8 @@ class _SidebarWorkspaceState extends State<SidebarWorkspace> {
     }
   }
 
+  // This function is a workaround, when we support open the workspace from invitation deep link,
+  // we should refactor the code here
   void _openWorkspaceFromInvitation() {
     final workspaceId = openWorkspaceIdNotifier.value;
     if (workspaceId == null) {

frontend/appflowy_flutter/test/unit_test/deeplink/deeplink_test.dart

@@ -0,0 +1,79 @@
+import 'package:appflowy/startup/tasks/deeplink/deeplink_handler.dart';
+import 'package:appflowy/startup/tasks/deeplink/invitation_deeplink_hanlder.dart';
+import 'package:appflowy/startup/tasks/deeplink/login_deeplink_handler.dart';
+import 'package:appflowy/startup/tasks/deeplink/payment_deeplink_handler.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('deep link handler: ', () {
+    final deepLinkHandlerRegistry = DeepLinkHandlerRegistry.instance
+      ..register(LoginDeepLinkHandler())
+      ..register(PaymentDeepLinkHandler())
+      ..register(InvitationDeepLinkHandler());
+
+    test('invitation deep link handler', () {
+      final uri =
+          Uri.parse('appflowy-flutter://invitation-callback?workspace_id=123');
+      deepLinkHandlerRegistry.processDeepLink(
+        uri: uri,
+        onStateChange: (handler, state) {
+          expect(handler, isA<InvitationDeepLinkHandler>());
+        },
+        onResult: (handler, result) {
+          expect(handler, isA<InvitationDeepLinkHandler>());
+          expect(result.isSuccess, true);
+        },
+        onError: (error) {
+          expect(error, isNull);
+        },
+      );
+    });
+
+    test('login deep link handler', () {
+      final uri = Uri.parse('appflowy-flutter://login');
+      deepLinkHandlerRegistry.processDeepLink(
+        uri: uri,
+        onStateChange: (handler, state) {
+          expect(handler, isA<LoginDeepLinkHandler>());
+        },
+        onResult: (handler, result) {
+          expect(handler, isA<LoginDeepLinkHandler>());
+          expect(result.isSuccess, true);
+        },
+        onError: (error) {
+          expect(error, isNull);
+        },
+      );
+    });
+
+    test('payment deep link handler', () {
+      final uri = Uri.parse('appflowy-flutter://payment');
+      deepLinkHandlerRegistry.processDeepLink(
+        uri: uri,
+        onStateChange: (handler, state) {
+          expect(handler, isA<PaymentDeepLinkHandler>());
+        },
+        onResult: (handler, result) {
+          expect(handler, isA<PaymentDeepLinkHandler>());
+          expect(result.isSuccess, true);
+        },
+        onError: (error) {
+          expect(error, isNull);
+        },
+      );
+    });
+
+    test('unknown deep link handler', () {
+      final uri =
+          Uri.parse('appflowy-flutter://unknown-callback?workspace_id=123');
+      deepLinkHandlerRegistry.processDeepLink(
+        uri: uri,
+        onStateChange: (handler, state) {},
+        onResult: (handler, result) {},
+        onError: (error) {
+          expect(error, isNotNull);
+        },
+      );
+    });
+  });
+}