refactor: refactoring http request creation and sending (#395)

* refactoring http request creation and sending

* fix lint error

* increase the test coverage of client.go

* refactor: Change the style of HTTPRequestBuilder.Build func to one-argument-per-line.

client_test.go

@@ -16,7 +16,7 @@ var errTestRequestBuilderFailed = errors.New("test request builder failed")
 
 type failingRequestBuilder struct{}
 
-func (*failingRequestBuilder) Build(_ context.Context, _, _ string, _ any) (*http.Request, error) {
+func (*failingRequestBuilder) Build(_ context.Context, _, _ string, _ any, _ http.Header) (*http.Request, error) {
 	return nil, errTestRequestBuilderFailed
 }
 
@@ -41,9 +41,10 @@ func TestDecodeResponse(t *testing.T) {
 	stringInput := ""
 
 	testCases := []struct {
-		name  string
-		value interface{}
-		body  io.Reader
+		name     string
+		value    interface{}
+		body     io.Reader
+		hasError bool
 	}{
 		{
 			name:  "nil input",
@@ -60,18 +61,32 @@ func TestDecodeResponse(t *testing.T) {
 			value: &map[string]interface{}{},
 			body:  bytes.NewReader([]byte(`{"test": "test"}`)),
 		},
+		{
+			name:     "reader return error",
+			value:    &stringInput,
+			body:     &errorReader{err: errors.New("dummy")},
+			hasError: true,
+		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			err := decodeResponse(tc.body, tc.value)
-			if err != nil {
+			if (err != nil) != tc.hasError {
 				t.Errorf("Unexpected error: %v", err)
 			}
 		})
 	}
 }
 
+type errorReader struct {
+	err error
+}
+
+func (e *errorReader) Read(_ []byte) (n int, err error) {
+	return 0, e.err
+}
+
 func TestHandleErrorResp(t *testing.T) {
 	// var errRes *ErrorResponse
 	var errRes ErrorResponse