feat(mocktail_image_network): add customizable imageBytes

packages/mocktail_image_network/lib/src/mocktail_image_network.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:mocktail/mocktail.dart';
 
@@ -39,10 +40,12 @@ import 'package:mocktail/mocktail.dart';
 /// }
 /// ```
 /// {@endtemplate}
-T mockNetworkImages<T>(T Function() body) {
+T mockNetworkImages<T>(T Function() body, {Uint8List? imageBytes}) {
   return HttpOverrides.runZoned(
     body,
-    createHttpClient: (_) => _createHttpClient(),
+    createHttpClient: (_) => _createHttpClient(
+      data: imageBytes ?? _transparentPixelPng,
+    ),
   );
 }
 
@@ -59,7 +62,7 @@ class _MockHttpClientResponse extends Mock implements HttpClientResponse {}
 
 class _MockHttpHeaders extends Mock implements HttpHeaders {}
 
-HttpClient _createHttpClient() {
+HttpClient _createHttpClient({required List<int> data}) {
   final client = _MockHttpClient();
   final request = _MockHttpClientRequest();
   final response = _MockHttpClientResponse();
@@ -79,7 +82,7 @@ HttpClient _createHttpClient() {
     final onData =
         invocation.positionalArguments[0] as void Function(List<int>);
     final onDone = invocation.namedArguments[#onDone] as void Function()?;
-    return Stream<List<int>>.fromIterable(<List<int>>[_transparentPixelPng])
+    return Stream<List<int>>.fromIterable(<List<int>>[data])
         .listen(onData, onDone: onDone);
   });
   when(() => request.headers).thenReturn(headers);

packages/mocktail_image_network/test/mocktail_image_network_test.dart

@@ -44,5 +44,27 @@ void main() {
         expect(onDoneCalled, isTrue);
       });
     });
+
+    test('should properly use custom imageBytes', () async {
+      final greenPixel = base64Decode(
+        '''iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M/wHwAEBgIApD5fRAAAAABJRU5ErkJggg==''',
+      );
+      await mockNetworkImages(
+        () async {
+          final client = HttpClient()..autoUncompress = false;
+          final request = await client.getUrl(Uri.https(''));
+          final response = await request.close();
+          final data = <int>[];
+
+          response.listen(data.addAll);
+
+          // Wait for all microtasks to run
+          await Future<void>.delayed(Duration.zero);
+
+          expect(data, equals(greenPixel));
+        },
+        imageBytes: greenPixel,
+      );
+    });
   });
 }