add testcase

tests/scanner_valuer_test.go

@@ -36,6 +36,8 @@ func TestScannerValuer(t *testing.T) {
 			{"name2", "value2"},
 		},
 		Role:             Role{Name: "admin"},
+		ExampleStruct:    ExampleStruct1{"name", "value"},
+		ExampleStructPtr: &ExampleStruct1{"name", "value"},
 	}
 
 	if err := DB.Create(&data).Error; err != nil {
@@ -49,6 +51,14 @@ func TestScannerValuer(t *testing.T) {
 	}
 
 	AssertObjEqual(t, data, result, "Name", "Gender", "Age", "Male", "Height", "Birthday", "Password", "Bytes", "Num", "Strings", "Structs")
+
+	if result.ExampleStructPtr.Val != "value" {
+		t.Errorf(`ExampleStructPtr.Val should equal to "value", but got %v`, result.ExampleStructPtr.Val)
+	}
+
+	if result.ExampleStruct.Val != "value" {
+		t.Errorf(`ExampleStruct.Val should equal to "value", but got %v`, result.ExampleStruct.Val)
+	}
 }
 
 func TestScannerValuerWithFirstOrCreate(t *testing.T) {
@@ -139,6 +149,8 @@ type ScannerValuerStruct struct {
 	UserID           *sql.NullInt64
 	User             User
 	EmptyTime        EmptyTime
+	ExampleStruct    ExampleStruct1
+	ExampleStructPtr *ExampleStruct1
 }
 
 type EncryptedData []byte
@@ -207,6 +219,31 @@ type ExampleStruct struct {
 	Value string
 }
 
+type ExampleStruct1 struct {
+	Name  string `json:"name,omitempty"`
+	Val   string `json:"val,omitempty"`
+}
+
+func (s ExampleStruct1) Value() (driver.Value, error) {
+	if len(s.Name) == 0 {
+		return nil, nil
+	}
+	//for test, has no practical meaning
+	s.Name = ""
+	return json.Marshal(s)
+}
+
+func (s *ExampleStruct1) Scan(src interface{}) error {
+	switch value := src.(type) {
+	case string:
+		return json.Unmarshal([]byte(value), s)
+	case []byte:
+		return json.Unmarshal(value, s)
+	default:
+		return errors.New("not supported")
+	}
+}
+
 type StructsSlice []ExampleStruct
 
 func (l StructsSlice) Value() (driver.Value, error) {