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deepcopy_test.go
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deepcopy_test.go
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package deepcopy
import (
"fmt"
"reflect"
"testing"
"time"
"github.com/google/go-cmp/cmp"
)
func TestBasic(t *testing.T) {
t.Parallel()
type mystring string
one := 1
var iface1 any = &one
tests := []any{
1,
1.0,
"foo",
mystring("foo"),
[]string{"foo", "bar"},
[]string{},
[]string(nil),
map[string][]int{"foo": {1, 2, 3}},
map[string][]int{},
map[string][]int(nil),
[...]int{1, 2, 3},
&iface1,
}
for _, test := range tests {
t.Run(fmt.Sprintf("DeepClone(%#v)", test), func(t *testing.T) {
testc := DeepClone(test)
equal(t, test, testc)
})
}
}
func TestSlice(t *testing.T) {
t.Parallel()
tests := []any{
[]int{1, 2, 3},
[]string{"foo", "bar"},
[]string(nil),
[]string{},
}
for _, test := range tests {
t.Run(fmt.Sprintf("DeepClone(%#v)", test), func(t *testing.T) {
testc := DeepClone(test)
equal(t, test, testc)
})
}
}
func TestMap(t *testing.T) {
t.Parallel()
tests := []any{
map[string][]int{"foo": {1, 2, 3}},
map[string][]int{},
map[string][]int(nil),
}
for _, test := range tests {
t.Run(fmt.Sprintf("DeepClone(%#v)", test), func(t *testing.T) {
testc := DeepClone(test)
equal(t, test, testc)
})
}
}
func TestStruct(t *testing.T) {
t.Parallel()
type mystring string
type S1 struct {
Ints []int
}
type S2 struct {
I int
F float64
String string
MyString mystring
Strings []string
EmptySlice []string
NilSlice []string
Map map[string][]int
EmptyMap map[string][]int
NilMap map[string][]int
StructSlice []S1
StructPointerSlice []*S1
StructMap map[string]S1
StructPointerMap map[string]*S1
S1
T time.Time
}
var src = &S2{
I: 1,
F: 1.0,
String: "foo",
MyString: mystring("foo"),
Strings: []string{"foo", "bar"},
EmptySlice: []string{},
Map: map[string][]int{"foo": {1, 2, 3}},
EmptyMap: map[string][]int{},
StructSlice: []S1{{[]int{1, 2, 3}}},
StructPointerSlice: []*S1{{[]int{1, 2, 3}}},
StructMap: map[string]S1{
"foo": {[]int{1, 2, 3}},
},
StructPointerMap: map[string]*S1{
"foo": {[]int{1, 2, 3}},
},
S1: S1{[]int{1, 2, 3}},
T: time.Now(),
}
dst := DeepClone(src).(*S2)
equal(t, src, dst)
}
func TestUnexportedFields(t *testing.T) {
t.Parallel()
type Unexported struct {
a string
b int
c []int
d map[string]string
}
src := &Unexported{
a: "foobar",
b: 23,
c: []int{23},
d: map[string]string{"foo": "bar"},
}
dst := DeepClone(src).(*Unexported)
if dst == src {
t.Fatal("expected different pointer")
}
if !cmp.Equal(&Unexported{}, dst, cmp.AllowUnexported(Unexported{})) {
t.Error(cmp.Diff(&Unexported{}, dst, cmp.AllowUnexported(Unexported{})))
}
}
func TestTimeCopy(t *testing.T) {
t.Parallel()
tests := []struct {
year int
month time.Month
day, hour, min, sec, nsec int
TZ string
}{
{2016, time.July, 4, 23, 11, 33, 3000, "America/New_York"},
{2015, time.October, 31, 9, 44, 23, 45935, "UTC"},
{2014, time.May, 5, 22, 01, 50, 219300, "Europe/Prague"},
}
for i, tt := range tests {
loc, err := time.LoadLocation(tt.TZ)
if err != nil {
t.Errorf("%d: unexpected error: %v", i, err)
continue
}
src := time.Date(tt.year, tt.month, tt.day, tt.hour, tt.min, tt.sec, tt.nsec, loc)
dst := DeepClone(src).(time.Time)
if !src.Equal(dst) {
t.Error("time copy error")
}
}
}
type Bar struct {
A string
}
const text = "foobar"
func (*Bar) Clone() *Bar {
return &Bar{text}
}
type Foo struct {
*Bar
}
func TestClone(t *testing.T) {
t.Parallel()
bar := &Bar{"hello"}
bc := DeepClone(bar).(*Bar)
if text != bc.A {
t.Errorf("got %q, want %q", bc.A, text)
}
foo := &Foo{&Bar{"hello"}}
fc := DeepClone(foo).(*Foo)
if text != fc.A {
t.Errorf("got %q, want %q", fc.A, text)
}
}
func equal(t testing.TB, x, y any, opts ...cmp.Option) bool {
t.Helper()
if x == nil || y == nil {
if x != y {
t.Errorf("%#v != %#v", x, y)
return false
}
return true
}
v1 := reflect.ValueOf(x)
v2 := reflect.ValueOf(y)
if v1.Type() != v2.Type() {
t.Errorf("%s != %s", v1.Type(), v2.Type())
return false
}
return valueEqual(t, v1, v2, opts...)
}
func valueEqual(t testing.TB, v1, v2 reflect.Value, opts ...cmp.Option) bool {
t.Helper()
if !v1.IsValid() || !v2.IsValid() {
if v1.IsValid() != v2.IsValid() {
t.Errorf("IsValid mismatch %t != %t", v1.IsValid(), v2.IsValid())
return false
}
return true
}
if v1.Type() != v2.Type() {
t.Errorf("%s != %s", v1.Type(), v2.Type())
return false
}
switch v1.Kind() {
case reflect.Slice:
if v1.Len() == 0 || v2.Len() == 0 {
if v1.IsNil() != v2.IsNil() {
t.Errorf("nil, mismatch %t != %t", v1.IsNil(), v2.IsNil())
return false
}
return true
}
if v1.Len() != v2.Len() {
t.Errorf("len, mismatch %d != %d", v1.Len(), v2.Len())
return false
}
if v1.UnsafePointer() == v2.UnsafePointer() {
t.Errorf("pointer to same underlying array %p == %p", v1.UnsafePointer(), v2.UnsafePointer())
return false
}
for i := 0; i < v1.Len(); i++ {
if !valueEqual(t, v1.Index(i), v2.Index(i), opts...) {
return false
}
}
return true
case reflect.Interface:
if v1.IsNil() || v2.IsNil() {
if v1.IsNil() != v2.IsNil() {
t.Errorf("nil, mismatch %t != %t", v1.IsNil(), v2.IsNil())
return false
}
return true
}
return valueEqual(t, v1.Elem(), v2.Elem(), opts...)
case reflect.Pointer:
if v1.IsNil() || v2.IsNil() {
if v1.IsNil() != v2.IsNil() {
t.Errorf("nil, mismatch %t != %t", v1.IsNil(), v2.IsNil())
return false
}
return true
}
if v1.UnsafePointer() == v2.UnsafePointer() {
t.Errorf("pointer to same location %p == %p", v1.UnsafePointer(), v2.UnsafePointer())
return false
}
return valueEqual(t, v1.Elem(), v2.Elem(), opts...)
case reflect.Struct:
if timeType == v1.Type() {
return v1.Interface().(time.Time).Equal(v2.Interface().(time.Time))
}
for i := 0; i < v1.NumField(); i++ {
if !valueEqual(t, v1.Field(i), v2.Field(i), opts...) {
t.Errorf("%s %s mismatch", v1.Type().Field(i).Name, v1.Type())
return false
}
}
return true
case reflect.Map:
if v1.Len() == 0 || v2.Len() == 0 {
if v1.IsNil() != v2.IsNil() {
t.Errorf("nil, mismatch %t != %t", v1.IsNil(), v2.IsNil())
return false
}
return true
}
if v1.Len() != v2.Len() {
t.Errorf("len, mismatch %d != %d", v1.Len(), v2.Len())
return false
}
if v1.UnsafePointer() == v2.UnsafePointer() {
t.Errorf("pointer to same location")
return false
}
for mi := v1.MapRange(); mi.Next(); {
val1 := mi.Value()
val2 := v2.MapIndex(mi.Key())
if !val1.IsValid() || !val2.IsValid() || !valueEqual(t, val1, val2, opts...) {
return false
}
}
return true
default:
if !cmp.Equal(v1.Interface(), v2.Interface(), opts...) {
t.Error(cmp.Diff(v1.Interface(), v2.Interface(), opts...))
return false
}
}
return true
}