fix(functions_client): Handle binary data request properly and improve test coverage

packages/functions_client/lib/src/functions_client.dart

@@ -119,15 +119,16 @@ class FunctionsClient {
     } else {
       final bodyRequest = http.Request(method.name, uri);
 
-      final String? bodyStr;
       if (body == null) {
-        bodyStr = null;
+        // No body to set
       } else if (body is String) {
-        bodyStr = body;
+        bodyRequest.body = body;
+      } else if (body is Uint8List) {
+        bodyRequest.bodyBytes = body;
       } else {
-        bodyStr = await _isolate.encode(body);
+        final bodyStr = await _isolate.encode(body);
+        bodyRequest.body = bodyStr;
       }
-      if (bodyStr != null) bodyRequest.body = bodyStr;
       request = bodyRequest;
     }
 

packages/functions_client/test/custom_http_client.dart

@@ -24,6 +24,7 @@ class CustomHttpClient extends BaseClient {
         headers: {
           "Content-Type": "application/json",
         },
+        reasonPhrase: "Enhance Your Calm",
       );
     } else if (request.url.path.endsWith('sse')) {
       return StreamedResponse(
@@ -32,8 +33,37 @@ class CustomHttpClient extends BaseClient {
           headers: {
             "Content-Type": "text/event-stream",
           });
+    } else if (request.url.path.endsWith('binary')) {
+      return StreamedResponse(
+        Stream.value([1, 2, 3, 4, 5]),
+        200,
+        request: request,
+        headers: {
+          "Content-Type": "application/octet-stream",
+        },
+      );
+    } else if (request.url.path.endsWith('text')) {
+      return StreamedResponse(
+        Stream.value(utf8.encode('Hello World')),
+        200,
+        request: request,
+        headers: {
+          "Content-Type": "text/plain",
+        },
+      );
+    } else if (request.url.path.endsWith('empty-json')) {
+      return StreamedResponse(
+        Stream.value([]),
+        200,
+        request: request,
+        headers: {
+          "Content-Type": "application/json",
+        },
+      );
     } else {
       final Stream<List<int>> stream;
+      final Map<String, String> headers;
+
       if (request is MultipartRequest) {
         stream = Stream.value(
           utf8.encode(jsonEncode([
@@ -44,16 +74,27 @@ class CustomHttpClient extends BaseClient {
               }
           ])),
         );
+        headers = {"Content-Type": "application/json"};
       } else {
-        stream = Stream.value(utf8.encode(jsonEncode({"key": "Hello World"})));
+        // Check if the request contains binary data (Uint8List)
+        final isOctetStream =
+            request.headers['Content-Type'] == 'application/octet-stream';
+        if (isOctetStream) {
+          // Return the original binary data
+          final bodyBytes = (request as Request).bodyBytes;
+          stream = Stream.value(bodyBytes);
+          headers = {"Content-Type": "application/octet-stream"};
+        } else {
+          stream =
+              Stream.value(utf8.encode(jsonEncode({"key": "Hello World"})));
+          headers = {"Content-Type": "application/json"};
+        }
       }
       return StreamedResponse(
         stream,
         200,
         request: request,
-        headers: {
-          "Content-Type": "application/json",
-        },
+        headers: headers,
       );
     }
   }

packages/functions_client/test/functions_dart_test.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:typed_data';
 
 import 'package:functions_client/src/functions_client.dart';
 import 'package:functions_client/src/types.dart';
@@ -152,6 +153,214 @@ void main() {
         expect(req.body, '{"thekey":"thevalue"}');
         expect(req.headers["Content-Type"], contains("application/json"));
       });
+
+      test('Uint8List is properly encoded as binary data', () async {
+        final binaryData = Uint8List.fromList([1, 2, 3, 4, 5]);
+        await functionsCustomHttpClient.invoke('function', body: binaryData);
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req, isA<Request>());
+
+        req as Request;
+        expect(req.bodyBytes, equals(binaryData));
+        expect(req.headers["Content-Type"], equals("application/octet-stream"));
+      });
+
+      test('null body sends no content-type', () async {
+        await functionsCustomHttpClient.invoke('function');
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req, isA<Request>());
+
+        req as Request;
+        expect(req.body, '');
+        expect(req.headers.containsKey("Content-Type"), isFalse);
+      });
+    });
+
+    group('HTTP methods', () {
+      test('GET method', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          method: HttpMethod.get,
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.method, 'get');
+      });
+
+      test('PUT method', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          method: HttpMethod.put,
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.method, 'put');
+      });
+
+      test('DELETE method', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          method: HttpMethod.delete,
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.method, 'delete');
+      });
+
+      test('PATCH method', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          method: HttpMethod.patch,
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.method, 'patch');
+      });
+    });
+
+    group('Headers', () {
+      test('setAuth updates authorization header', () async {
+        functionsCustomHttpClient.setAuth('new-token');
+
+        await functionsCustomHttpClient.invoke('function');
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.headers['Authorization'], 'Bearer new-token');
+      });
+
+      test('headers getter returns current headers', () {
+        functionsCustomHttpClient.setAuth('test-token');
+
+        final headers = functionsCustomHttpClient.headers;
+        expect(headers['Authorization'], 'Bearer test-token');
+        expect(headers, contains('X-Client-Info'));
+      });
+
+      test('custom headers override defaults', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          headers: {'Content-Type': 'custom/type'},
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.headers['Content-Type'], 'custom/type');
+      });
+
+      test('custom headers merge with defaults', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          headers: {'X-Custom': 'value'},
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.headers['X-Custom'], 'value');
+        expect(req.headers, contains('X-Client-Info'));
+      });
+    });
+
+    group('Constructor variations', () {
+      test('constructor with all parameters', () {
+        final isolate = YAJsonIsolate();
+        final httpClient = CustomHttpClient();
+        final client = FunctionsClient(
+          'https://example.com',
+          {'X-Test': 'value'},
+          httpClient: httpClient,
+          isolate: isolate,
+        );
+
+        expect(client.headers['X-Test'], 'value');
+        expect(client.headers, contains('X-Client-Info'));
+      });
+
+      test('constructor with minimal parameters', () {
+        final client = FunctionsClient('https://example.com', {});
+
+        expect(client.headers, contains('X-Client-Info'));
+      });
+    });
+
+    group('Multipart requests', () {
+      test('multipart with both files and fields', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          body: {'field1': 'value1', 'field2': 'value2'},
+          files: [
+            MultipartFile.fromString('file1', 'content1'),
+            MultipartFile.fromString('file2', 'content2'),
+          ],
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.headers['Content-Type'], contains('multipart/form-data'));
+        expect(req, isA<MultipartRequest>());
+      });
+
+      test('multipart with only files', () async {
+        await functionsCustomHttpClient.invoke(
+          'function',
+          files: [MultipartFile.fromString('file', 'content')],
+        );
+
+        final req = customHttpClient.receivedRequests.last;
+        expect(req.headers['Content-Type'], contains('multipart/form-data'));
+        expect(req, isA<MultipartRequest>());
+      });
+    });
+
+    group('Response content types', () {
+      test('handles application/octet-stream response', () async {
+        final res = await functionsCustomHttpClient.invoke('binary');
+
+        expect(res.data, isA<Uint8List>());
+        expect(res.data, equals(Uint8List.fromList([1, 2, 3, 4, 5])));
+        expect(res.status, 200);
+      });
+
+      test('handles text/plain response', () async {
+        final res = await functionsCustomHttpClient.invoke('text');
+
+        expect(res.data, isA<String>());
+        expect(res.data, 'Hello World');
+        expect(res.status, 200);
+      });
+
+      test('handles empty JSON response', () async {
+        final res = await functionsCustomHttpClient.invoke('empty-json');
+
+        expect(res.data, '');
+        expect(res.status, 200);
+      });
+    });
+
+    group('Error handling', () {
+      test('FunctionException contains all error details', () async {
+        try {
+          await functionsCustomHttpClient.invoke('error-function');
+          fail('should throw');
+        } on FunctionException catch (e) {
+          expect(e.status, 420);
+          expect(e.details, isNotNull);
+          expect(e.reasonPhrase, isNotNull);
+          expect(e.toString(), contains('420'));
+        }
+      });
+    });
+
+    group('Edge cases', () {
+      test('multipart request with invalid body type throws assertion',
+          () async {
+        expect(
+          () => functionsCustomHttpClient.invoke(
+            'function',
+            body: 42, // Invalid: should be Map<String, String> for multipart
+            files: [MultipartFile.fromString('file', 'content')],
+          ),
+          throwsA(isA<AssertionError>()),
+        );
+      });
     });
   });
 }