Feature/support body get (#201)

chopper/lib/src/base.dart

@@ -349,6 +349,7 @@ class ChopperClient {
   /// Makes a HTTP GET request using the [send] function.
   Future<Response<BodyType>> get<BodyType, InnerType>(
     String url, {
+    dynamic body,
     Map<String, String> headers,
     Map<String, dynamic> parameters,
     String baseUrl,
@@ -358,6 +359,7 @@ class ChopperClient {
           HttpMethod.Get,
           url,
           baseUrl ?? this.baseUrl,
+          body: body,
           headers: headers,
           parameters: parameters,
         ),

chopper/test/base_test.dart

@@ -171,6 +171,30 @@ void main() {
       httpClient.close();
     });
 
+    test('GET with body', () async {
+      final httpClient = MockClient((request) async {
+        expect(
+          request.url.toString(),
+          equals('$baseUrl/test/get_body'),
+        );
+        expect(request.method, equals('GET'));
+        expect(request.body, equals('get body'));
+
+        return http.Response('get response', 200);
+      });
+
+      final chopper = buildClient(httpClient);
+      final service = chopper.getService<HttpTestService>();
+
+      final response =
+          await service.getBody('get body');
+
+      expect(response.body, equals('get response'));
+      expect(response.statusCode, equals(200));
+
+      httpClient.close();
+    });
+
     test('POST', () async {
       final httpClient = MockClient((request) async {
         expect(

chopper/test/test_service.dart

@@ -46,6 +46,9 @@ abstract class HttpTestService extends ChopperService {
     @Query('test') bool test,
   });
 
+  @Get(path: 'get_body')
+  Future<Response> getBody(@Body() dynamic body);
+
   @Post(path: 'post')
   Future<Response> postTest(@Body() String data);