add unit test, fix interceptor bug

core/mapping/fieldoptions_test.go

@@ -0,0 +1,31 @@
+package mapping
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type Bar struct {
+	Val string `json:"val"`
+}
+
+func TestFieldOptionOptionalDep(t *testing.T) {
+	var bar Bar
+	rt := reflect.TypeOf(bar)
+	for i := 0; i < rt.NumField(); i++ {
+		field := rt.Field(i)
+		val, opt, err := parseKeyAndOptions(jsonTagKey, field)
+		assert.Equal(t, "val", val)
+		assert.Nil(t, opt)
+		assert.Nil(t, err)
+	}
+
+	// check nil working
+	var o *fieldOptions
+	check := func(o *fieldOptions) {
+		assert.Equal(t, 0, len(o.optionalDep()))
+	}
+	check(o)
+}