updated test

Author: badnikhil

test/models/http_request_model_test.dart

@@ -33,7 +33,7 @@ void main() {
       'User-Agent': 'Test Agent',
       'Content-Type': 'application/json; charset=utf-8'
     });
-    expect(httpRequestModel.paramsMap, {'size': '2', 'len': '3'});
+    expect(httpRequestModel.paramsMap, {'size': ['2'], 'len': ['3']});
     expect(httpRequestModel.enabledHeaders, const [
       NameValueModel(
           name: 'Content-Type', value: 'application/json; charset=utf-8')
@@ -44,7 +44,7 @@ void main() {
     ]);
     expect(httpRequestModel.enabledHeadersMap,
         {'Content-Type': 'application/json; charset=utf-8'});
-    expect(httpRequestModel.enabledParamsMap, {'size': '2', 'len': '3'});
+    expect(httpRequestModel.enabledParamsMap, {'size': ['2'], 'len': ['3']});
     expect(httpRequestModel.hasContentTypeHeader, true);
 
     expect(httpRequestModel.hasFormDataContentType, false);