feat(dart_frog): add Response.stream (#562)

Author: felangel

packages/dart_frog/lib/src/response.dart

@@ -19,6 +19,19 @@ class Response {
           ),
         );
 
+  /// Create a [Response] with a stream of bytes.
+  Response.stream({
+    int statusCode = 200,
+    Stream<List<int>>? body,
+    Map<String, Object>? headers,
+  }) : this._(
+          shelf.Response(
+            statusCode,
+            body: body,
+            headers: headers,
+          ),
+        );
+
   /// Create a [Response] with a byte array body.
   Response.bytes({
     int statusCode = 200,

packages/dart_frog/test/src/response_test.dart

@@ -100,6 +100,15 @@ void main() {
       });
     });
 
+    group('stream', () {
+      test('has correct body', () {
+        final bytes = utf8.encode('hello');
+        final stream = Stream.value(bytes);
+        final response = Response.stream(body: stream);
+        expect(response.bytes(), emits(equals(bytes)));
+      });
+    });
+
     group('formData', () {
       final contentTypeFormUrlEncoded = {
         HttpHeaders.contentTypeHeader: formUrlEncodedContentType.mimeType