add unit test to e2e

Author: CareF

packages/e2e/lib/e2e.dart

@@ -93,36 +93,39 @@ class E2EWidgetsFlutterBinding extends LiveTestWidgetsFlutterBinding {
     });
   }
 
+  /// the callback function to response the driver side input.
+  @visibleForTesting
+  Future<Map<String, dynamic>> callback(Map<String, String> params) async {
+    final String command = params['command'];
+    Map<String, String> response;
+    switch (command) {
+      case 'request_data':
+        final bool allTestsPassed = await _allTestsPassed.future;
+        response = <String, String>{
+          'message': allTestsPassed
+              ? Response.allTestsPassed(data: _data).toJson()
+              : Response.someTestsFailed(
+                  _failureMethodsDetails,
+                  data: _data,
+                ).toJson(),
+        };
+        break;
+      case 'get_health':
+        response = <String, String>{'status': 'ok'};
+        break;
+      default:
+        throw UnimplementedError('$command is not implemented');
+    }
+    return <String, dynamic>{
+      'isError': false,
+      'response': response,
+    };
+  }
+
   // Emulates the Flutter driver extension, returning 'pass' or 'fail'.
   @override
   void initServiceExtensions() {
     super.initServiceExtensions();
-    Future<Map<String, dynamic>> callback(Map<String, String> params) async {
-      final String command = params['command'];
-      Map<String, String> response;
-      switch (command) {
-        case 'request_data':
-          final bool allTestsPassed = await _allTestsPassed.future;
-          response = <String, String>{
-            'message': allTestsPassed
-                ? Response.allTestsPassed(data: _data).toJson()
-                : Response.someTestsFailed(
-                    _failureMethodsDetails,
-                    data: _data,
-                  ).toJson(),
-          };
-          break;
-        case 'get_health':
-          response = <String, String>{'status': 'ok'};
-          break;
-        default:
-          throw UnimplementedError('$command is not implemented');
-      }
-      return <String, dynamic>{
-        'isError': false,
-        'response': response,
-      };
-    }
 
     if (kIsWeb) {
       registerWebServiceExtension(callback);

packages/e2e/test/binding_test.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+
+import 'package:e2e/e2e.dart';
+import 'package:e2e/common.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() async {
+  Future<Map<String, dynamic>> request;
+
+  group('Test E2E binding', () {
+    final WidgetsBinding binding = E2EWidgetsFlutterBinding.ensureInitialized();
+    assert(binding is E2EWidgetsFlutterBinding);
+    final E2EWidgetsFlutterBinding e2ebinding =
+        binding as E2EWidgetsFlutterBinding;
+
+    setUp(() {
+      request = e2ebinding.callback(<String, String>{
+        'command': 'request_data',
+      });
+    });
+
+    testWidgets('Run E2E app', (WidgetTester tester) async {
+      runApp(MaterialApp(
+        home: Text('Test'),
+      ));
+      expect(tester.binding, e2ebinding);
+      e2ebinding.addData(<String, dynamic>{'answer': 42});
+    });
+  });
+
+  tearDownAll(() async {
+    // This part is outside the group so that `request` has been compeleted as
+    // part of the `tearDownAll` registerred in the group during
+    // `E2EWidgetsFlutterBinding` initialization.
+    final Map<String, dynamic> response =
+        (await request)['response'] as Map<String, dynamic>;
+    final String message = response['message'] as String;
+    Response result = Response.fromJson(message);
+    assert(result.data['answer'] == 42);
+  });
+}

packages/e2e/test/response_serialization_test.dart

@@ -0,0 +1,47 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:e2e/common.dart';
+
+void main() {
+  test('Serialize and deserialize Failure', () {
+    Failure fail = Failure('what a name', 'no detail');
+    Failure restored = Failure.fromJsonString(fail.toString());
+    expect(restored.methodName, fail.methodName);
+    expect(restored.details, fail.details);
+  });
+
+  test('Serialize and deserialize Response', () {
+    Response response, restored;
+    String jsonString;
+
+    response = Response.allTestsPassed();
+    jsonString = response.toJson();
+    expect(jsonString, '{"result":"true","failureDetails":[]}');
+    restored = Response.fromJson(jsonString);
+    expect(restored.allTestsPassed, response.allTestsPassed);
+    expect(restored.data, null);
+    expect(restored.formattedFailureDetails, '');
+
+    final Failure fail = Failure('what a name', 'no detail');
+    final Failure fail2 = Failure('what a name2', 'no detail2');
+    response = Response.someTestsFailed([fail, fail2]);
+    jsonString = response.toJson();
+    restored = Response.fromJson(jsonString);
+    expect(restored.allTestsPassed, response.allTestsPassed);
+    expect(restored.data, null);
+    expect(restored.formattedFailureDetails, response.formattedFailureDetails);
+
+    Map<String, dynamic> data = <String, dynamic>{'aaa': 'bbb'};
+    response = Response.allTestsPassed(data: data);
+    jsonString = response.toJson();
+    restored = Response.fromJson(jsonString);
+    expect(restored.data.keys, ['aaa']);
+    expect(restored.data.values, ['bbb']);
+
+    response = Response.someTestsFailed([fail, fail2], data: data);
+    jsonString = response.toJson();
+    restored = Response.fromJson(jsonString);
+    expect(restored.data.keys, ['aaa']);
+    expect(restored.data.values, ['bbb']);
+  });
+}