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pkgs/http/lib/src/mock_client.dart

@@ -12,6 +12,11 @@ import 'response.dart';
 import 'streamed_request.dart';
 import 'streamed_response.dart';
 
+final _pngImageData = base64Decode(
+  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDw'
+  'AEhQGAhKmMIQAAAABJRU5ErkJggg==',
+);
+
 // TODO(nweiz): once Dart has some sort of Rack- or WSGI-like standard for
 // server APIs, MockClient should conform to it.
 
@@ -73,13 +78,15 @@ class MockClient extends BaseClient {
   }
 
   /// Return a response containing a PNG image.
-  static Response pngResponse() => Response.bytes(
-      base64Decode(
-        'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQ'
-        'GAhKmMIQAAAABJRU5ErkJggg==',
-      ),
-      200,
-      headers: const {'Content-Type': 'image/png'});
+  static Response pngResponse({BaseRequest? request}) {
+    final headers = {
+      'content-type': 'image/png',
+      'content-length': '${_pngImageData.length}'
+    };
+
+    return Response.bytes(_pngImageData, 200,
+        request: request, headers: headers, reasonPhrase: 'OK');
+  }
 }
 
 /// A handler function that receives [StreamedRequest]s and sends

pkgs/http/test/mock_client_test.dart

@@ -5,6 +5,7 @@
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
+import 'package:http/src/request.dart';
 import 'package:http/testing.dart';
 import 'package:test/test.dart';
 
@@ -43,4 +44,25 @@ void main() {
     expect(await client.read(Uri.http('example.com', '/foo')),
         equals('you did it'));
   });
+
+  test('pngResponse with default options', () {
+    final response = MockClient.pngResponse();
+    expect(response.statusCode, 200);
+    expect(response.bodyBytes.take(8),
+        [137, 80, 78, 71, 13, 10, 26, 10] // PNG header
+        );
+    expect(response.request, null);
+    expect(response.headers, containsPair('content-type', 'image/png'));
+  });
+
+  test('pngResponse with request', () {
+    final request = Request('GET', Uri.https('example.com'));
+    final response = MockClient.pngResponse(request: request);
+    expect(response.statusCode, 200);
+    expect(response.bodyBytes.take(8),
+        [137, 80, 78, 71, 13, 10, 26, 10] // PNG header
+        );
+    expect(response.request, request);
+    expect(response.headers, containsPair('content-type', 'image/png'));
+  });
 }