[Go] add ref tracking tests (#967)

add ref tracking tests

go/fury/reference_test.go

@@ -0,0 +1,116 @@
+// Copyright 2023 The Fury Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fury
+
+import (
+	"github.com/stretchr/testify/require"
+	"reflect"
+	"testing"
+	"unsafe"
+)
+
+func TestReferenceResolver(t *testing.T) {
+	refResolver := newReferenceResolver(true)
+	buf := NewByteBuffer(nil)
+	var values []interface{}
+	values = append(values, commonSlice()...)
+	values = append(values, commonMap()...)
+	foo := newFoo()
+	bar := Bar{}
+	values = append(values, "", "str", &foo, &bar)
+	for _, data := range values {
+		refWritten, err := refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(data))
+		require.Nil(t, err)
+		require.False(t, refWritten)
+		refWritten, err = refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(data))
+		require.Nil(t, err)
+		require.True(t, refWritten)
+	}
+	refResolver.readObjects = make([]reflect.Value, len(refResolver.writtenObjects))
+	for range values {
+		require.Equal(t, refResolver.ReadReferenceOrNull(buf), RefValueFlag)
+		require.Equal(t, refResolver.ReadReferenceOrNull(buf), RefFlag)
+	}
+	{
+		s := []int{1, 2, 3}
+		require.True(t, same(s, s))
+		require.False(t, same(s, s[1:]))
+		refWritten, err := refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(s))
+		require.Nil(t, err)
+		require.False(t, refWritten)
+		refWritten, err = refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(s))
+		require.Nil(t, err)
+		require.True(t, refWritten)
+		refWritten, err = refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(s[1:]))
+		require.Nil(t, err)
+		require.False(t, refWritten)
+	}
+}
+
+func TestNonReferenceResolver(t *testing.T) {
+	refResolver := newReferenceResolver(false)
+	buf := NewByteBuffer(nil)
+	var values []interface{}
+	values = append(values, commonSlice()...)
+	values = append(values, commonMap()...)
+	foo := newFoo()
+	bar := Bar{}
+	values = append(values, "", "str", &foo, &bar)
+	for _, data := range values {
+		refWritten, err := refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(data))
+		require.Nil(t, err)
+		require.False(t, refWritten)
+		refWritten, err = refResolver.WriteReferenceOrNull(buf, reflect.ValueOf(data))
+		require.Nil(t, err)
+		require.False(t, refWritten)
+	}
+	for range values {
+		require.Equal(t, refResolver.ReadReferenceOrNull(buf), NotNullValueFlag)
+		require.Equal(t, refResolver.ReadReferenceOrNull(buf), NotNullValueFlag)
+	}
+}
+
+func TestNullable(t *testing.T) {
+	var values []interface{}
+	values = append(values, commonSlice()...)
+	values = append(values, commonMap()...)
+	foo := newFoo()
+	bar := Bar{}
+	values = append(values, "", "str", &foo, &bar)
+	for _, data := range values {
+		require.True(t, nullable(reflect.ValueOf(data).Type()))
+	}
+	require.False(t, nullable(reflect.ValueOf(1).Type()))
+	var v1 []int
+	require.True(t, isNil(reflect.ValueOf(v1)))
+	var v2 map[string]int
+	require.True(t, isNil(reflect.ValueOf(v2)))
+	require.False(t, isNil(reflect.ValueOf("")))
+	var v3 interface{}
+	require.True(t, isNil(reflect.ValueOf(v3)))
+}
+
+func same(x, y interface{}) bool {
+	var vx, vy = reflect.ValueOf(x), reflect.ValueOf(y)
+	if vx.Type() != vy.Type() {
+		return false
+	}
+	if vx.Type().Kind() == reflect.Slice {
+		if vx.Len() != vy.Len() {
+			return false
+		}
+	}
+	return unsafe.Pointer(reflect.ValueOf(x).Pointer()) == unsafe.Pointer(reflect.ValueOf(y).Pointer())
+}