Modify flutter_tests dart:io mocks to support Dart 3.0 (#123706)

Modify flutter_tests dart:io mocks to support Dart 3.0

packages/flutter_test/lib/src/_binding_io.dart

@@ -206,10 +206,19 @@ class _MockHttpClient implements HttpClient {
 }
 
 /// A mocked [HttpClientRequest] which always returns a [_MockHttpClientResponse].
-class _MockHttpRequest extends HttpClientRequest {
+class _MockHttpRequest implements HttpClientRequest {
+  @override
+  bool bufferOutput = true;
+
+  @override
+  int contentLength = -1;
+
   @override
   late Encoding encoding;
 
+  @override
+  bool followRedirects = true;
+
   @override
   final HttpHeaders headers = _MockHttpHeaders();
 
@@ -246,9 +255,15 @@ class _MockHttpRequest extends HttpClientRequest {
     return Future<void>.value();
   }
 
+  @override
+  int maxRedirects = 5;
+
   @override
   String get method => '';
 
+  @override
+  bool persistentConnection = true;
+
   @override
   Uri get uri => Uri();
 
@@ -514,22 +529,49 @@ class _MockHttpResponse implements HttpClientResponse {
 }
 
 /// A mocked [HttpHeaders] that ignores all writes.
-class _MockHttpHeaders extends HttpHeaders {
+class _MockHttpHeaders implements HttpHeaders {
   @override
   List<String>? operator [](String name) => <String>[];
 
   @override
   void add(String name, Object value, {bool preserveHeaderCase = false}) { }
 
+  @override
+  late bool chunkedTransferEncoding;
+
   @override
   void clear() { }
 
+  @override
+  int contentLength = -1;
+
+  @override
+  ContentType? contentType;
+
+  @override
+  DateTime? date;
+
+  @override
+  DateTime? expires;
+
   @override
   void forEach(void Function(String name, List<String> values) f) { }
 
+  @override
+  String? host;
+
+  @override
+  DateTime? ifModifiedSince;
+
   @override
   void noFolding(String name) { }
 
+  @override
+  late bool persistentConnection;
+
+  @override
+  int? port;
+
   @override
   void remove(String name, Object value) { }
 

packages/flutter_tools/test/src/fake_http_client.dart

@@ -457,7 +457,7 @@ class _FakeHttpClientResponse extends Stream<List<int>> implements HttpClientRes
   int get statusCode => _response.statusCode;
 }
 
-class _FakeHttpHeaders extends HttpHeaders {
+class _FakeHttpHeaders implements HttpHeaders {
   _FakeHttpHeaders(this._backingData);
 
   final Map<String, List<String>> _backingData;
@@ -471,14 +471,32 @@ class _FakeHttpHeaders extends HttpHeaders {
     _backingData[name]!.add(value.toString());
   }
 
+  @override
+  late bool chunkedTransferEncoding;
+
   @override
   void clear() {
     _backingData.clear();
   }
 
+  @override
+  int contentLength = -1;
+
+  @override
+  ContentType? contentType;
+
+  @override
+  DateTime? date;
+
+  @override
+  DateTime? expires;
+
   @override
   void forEach(void Function(String name, List<String> values) action) { }
 
+  @override
+  String? host;
+
   @override
   void noFolding(String name) {  }
 
@@ -501,4 +519,13 @@ class _FakeHttpHeaders extends HttpHeaders {
   String? value(String name) {
     return _backingData[name]?.join('; ');
   }
+
+  @override
+  DateTime? ifModifiedSince;
+
+  @override
+  late bool persistentConnection;
+
+  @override
+  int? port;
 }