func TestCopyDifferentStructs(t *testing.T) {
type SrcFoo struct {
A int
B []*string
C map[string]*int
SrcUnique string
SameNameDiffType int
unexportedPtr *int
ExportedPtr *int
}
type DstFoo struct {
A int
B []*string
C map[string]*int
DstUnique int
SameNameDiffType string
unexportedPtr *int
ExportedPtr *int
}
// Create the initial value
str1 := "hello"
str2 := "bye bye"
int1 := 1
int2 := 2
f1 := &SrcFoo{
A: 1,
B: []*string{&str1, &str2},
C: map[string]*int{
"A": &int1,
"B": &int2,
},
SrcUnique: "unique",
SameNameDiffType: 1,
unexportedPtr: &int1,
ExportedPtr: &int2,
}
// Do the copy
var f2 DstFoo
awsutil.Copy(&f2, f1)
// Values are equal
assert.Equal(t, f2.A, f1.A)
assert.Equal(t, f2.B, f1.B)
assert.Equal(t, f2.C, f1.C)
assert.Equal(t, "unique", f1.SrcUnique)
assert.Equal(t, 1, f1.SameNameDiffType)
assert.Equal(t, 0, f2.DstUnique)
assert.Equal(t, "", f2.SameNameDiffType)
assert.Equal(t, int1, *f1.unexportedPtr)
assert.Nil(t, f2.unexportedPtr)
assert.Equal(t, int2, *f1.ExportedPtr)
assert.Equal(t, int2, *f2.ExportedPtr)
}
func TestCopyReader(t *testing.T) {
var buf io.Reader = bytes.NewReader([]byte("hello world"))
var r io.Reader
awsutil.Copy(&r, buf)
b, err := ioutil.ReadAll(r)
assert.NoError(t, err)
assert.Equal(t, []byte("hello world"), b)
// empty bytes because this is not a deep copy
b, err = ioutil.ReadAll(buf)
assert.NoError(t, err)
assert.Equal(t, []byte(""), b)
}
func TestCopyNestedWithUnexported(t *testing.T) {
type Bar struct {
a int
B int
}
type Foo struct {
A string
B Bar
}
f1 := &Foo{A: "string", B: Bar{a: 1, B: 2}}
var f2 Foo
awsutil.Copy(&f2, f1)
// Values match
assert.Equal(t, f2.A, f1.A)
assert.NotEqual(t, f2.B, f1.B)
assert.NotEqual(t, f2.B.a, f1.B.a)
assert.Equal(t, f2.B.B, f2.B.B)
}
func TestCopy(t *testing.T) {
type Foo struct {
A int
B []*string
C map[string]*int
}
// Create the initial value
str1 := "hello"
str2 := "bye bye"
int1 := 1
int2 := 2
f1 := &Foo{
A: 1,
B: []*string{&str1, &str2},
C: map[string]*int{
"A": &int1,
"B": &int2,
},
}
// Do the copy
var f2 Foo
awsutil.Copy(&f2, f1)
// Values are equal
assert.Equal(t, f2.A, f1.A)
assert.Equal(t, f2.B, f1.B)
assert.Equal(t, f2.C, f1.C)
// But pointers are not!
str3 := "nothello"
int3 := 57
f2.A = 100
f2.B[0] = &str3
f2.C["B"] = &int3
assert.NotEqual(t, f2.A, f1.A)
assert.NotEqual(t, f2.B, f1.B)
assert.NotEqual(t, f2.C, f1.C)
}
func ExampleCopy() {
type Foo struct {
A int
B []*string
}
// Create the initial value
str1 := "hello"
str2 := "bye bye"
f1 := &Foo{A: 1, B: []*string{&str1, &str2}}
// Do the copy
var f2 Foo
awsutil.Copy(&f2, f1)
// Print the result
fmt.Println(awsutil.Prettify(f2))
// Output:
// {
// A: 1,
// B: ["hello","bye bye"]
// }
}
func TestCopyIgnoreNilMembers(t *testing.T) {
type Foo struct {
A *string
B []string
C map[string]string
}
f := &Foo{}
assert.Nil(t, f.A)
assert.Nil(t, f.B)
assert.Nil(t, f.C)
var f2 Foo
awsutil.Copy(&f2, f)
assert.Nil(t, f2.A)
assert.Nil(t, f2.B)
assert.Nil(t, f2.C)
fcopy := awsutil.CopyOf(f)
f3 := fcopy.(*Foo)
assert.Nil(t, f3.A)
assert.Nil(t, f3.B)
assert.Nil(t, f3.C)
}
func TestCopyNil(t *testing.T) {
var s string
awsutil.Copy(&s, nil)
assert.Equal(t, "", s)
}
func TestCopyPrimitive(t *testing.T) {
str := "hello"
var s string
awsutil.Copy(&s, &str)
assert.Equal(t, "hello", s)
}