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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package reflect_test
import (
"bytes"
"encoding/base64"
"flag"
"fmt"
"go/token"
"internal/goarch"
"internal/testenv"
"io"
"math"
"math/rand"
"os"
. "reflect"
"reflect/internal/example1"
"reflect/internal/example2"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"unsafe"
)
var sink any
func TestBool(t *testing.T) {
v := ValueOf(true)
if v.Bool() != true {
t.Fatal("ValueOf(true).Bool() = false")
}
}
type integer int
type T struct {
a int
b float64
c string
d *int
}
type pair struct {
i any
s string
}
func assert(t *testing.T, s, want string) {
if s != want {
t.Errorf("have %#q want %#q", s, want)
}
}
var typeTests = []pair{
{struct{ x int }{}, "int"},
{struct{ x int8 }{}, "int8"},
{struct{ x int16 }{}, "int16"},
{struct{ x int32 }{}, "int32"},
{struct{ x int64 }{}, "int64"},
{struct{ x uint }{}, "uint"},
{struct{ x uint8 }{}, "uint8"},
{struct{ x uint16 }{}, "uint16"},
{struct{ x uint32 }{}, "uint32"},
{struct{ x uint64 }{}, "uint64"},
{struct{ x float32 }{}, "float32"},
{struct{ x float64 }{}, "float64"},
{struct{ x int8 }{}, "int8"},
{struct{ x (**int8) }{}, "**int8"},
{struct{ x (**integer) }{}, "**reflect_test.integer"},
{struct{ x ([32]int32) }{}, "[32]int32"},
{struct{ x ([]int8) }{}, "[]int8"},
{struct{ x (map[string]int32) }{}, "map[string]int32"},
{struct{ x (chan<- string) }{}, "chan<- string"},
{struct{ x (chan<- chan string) }{}, "chan<- chan string"},
{struct{ x (chan<- <-chan string) }{}, "chan<- <-chan string"},
{struct{ x (<-chan <-chan string) }{}, "<-chan <-chan string"},
{struct{ x (chan (<-chan string)) }{}, "chan (<-chan string)"},
{struct {
x struct {
c chan *int32
d float32
}
}{},
"struct { c chan *int32; d float32 }",
},
{struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"},
{struct {
x struct {
c func(chan *integer, *int8)
}
}{},
"struct { c func(chan *reflect_test.integer, *int8) }",
},
{struct {
x struct {
a int8
b int32
}
}{},
"struct { a int8; b int32 }",
},
{struct {
x struct {
a int8
b int8
c int32
}
}{},
"struct { a int8; b int8; c int32 }",
},
{struct {
x struct {
a int8
b int8
c int8
d int32
}
}{},
"struct { a int8; b int8; c int8; d int32 }",
},
{struct {
x struct {
a int8
b int8
c int8
d int8
e int32
}
}{},
"struct { a int8; b int8; c int8; d int8; e int32 }",
},
{struct {
x struct {
a int8
b int8
c int8
d int8
e int8
f int32
}
}{},
"struct { a int8; b int8; c int8; d int8; e int8; f int32 }",
},
{struct {
x struct {
a int8 `reflect:"hi there"`
}
}{},
`struct { a int8 "reflect:\"hi there\"" }`,
},
{struct {
x struct {
a int8 `reflect:"hi \x00there\t\n\"\\"`
}
}{},
`struct { a int8 "reflect:\"hi \\x00there\\t\\n\\\"\\\\\"" }`,
},
{struct {
x struct {
f func(args ...int)
}
}{},
"struct { f func(...int) }",
},
{struct {
x (interface {
a(func(func(int) int) func(func(int)) int)
b()
})
}{},
"interface { reflect_test.a(func(func(int) int) func(func(int)) int); reflect_test.b() }",
},
{struct {
x struct {
int32
int64
}
}{},
"struct { int32; int64 }",
},
}
var valueTests = []pair{
{new(int), "132"},
{new(int8), "8"},
{new(int16), "16"},
{new(int32), "32"},
{new(int64), "64"},
{new(uint), "132"},
{new(uint8), "8"},
{new(uint16), "16"},
{new(uint32), "32"},
{new(uint64), "64"},
{new(float32), "256.25"},
{new(float64), "512.125"},
{new(complex64), "532.125+10i"},
{new(complex128), "564.25+1i"},
{new(string), "stringy cheese"},
{new(bool), "true"},
{new(*int8), "*int8(0)"},
{new(**int8), "**int8(0)"},
{new([5]int32), "[5]int32{0, 0, 0, 0, 0}"},
{new(**integer), "**reflect_test.integer(0)"},
{new(map[string]int32), "map[string]int32{<can't iterate on maps>}"},
{new(chan<- string), "chan<- string"},
{new(func(a int8, b int32)), "func(int8, int32)(0)"},
{new(struct {
c chan *int32
d float32
}),
"struct { c chan *int32; d float32 }{chan *int32, 0}",
},
{new(struct{ c func(chan *integer, *int8) }),
"struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}",
},
{new(struct {
a int8
b int32
}),
"struct { a int8; b int32 }{0, 0}",
},
{new(struct {
a int8
b int8
c int32
}),
"struct { a int8; b int8; c int32 }{0, 0, 0}",
},
}
func testType(t *testing.T, i int, typ Type, want string) {
s := typ.String()
if s != want {
t.Errorf("#%d: have %#q, want %#q", i, s, want)
}
}
func TestTypes(t *testing.T) {
for i, tt := range typeTests {
testType(t, i, ValueOf(tt.i).Field(0).Type(), tt.s)
}
}
func TestSet(t *testing.T) {
for i, tt := range valueTests {
v := ValueOf(tt.i)
v = v.Elem()
switch v.Kind() {
case Int:
v.SetInt(132)
case Int8:
v.SetInt(8)
case Int16:
v.SetInt(16)
case Int32:
v.SetInt(32)
case Int64:
v.SetInt(64)
case Uint:
v.SetUint(132)
case Uint8:
v.SetUint(8)
case Uint16:
v.SetUint(16)
case Uint32:
v.SetUint(32)
case Uint64:
v.SetUint(64)
case Float32:
v.SetFloat(256.25)
case Float64:
v.SetFloat(512.125)
case Complex64:
v.SetComplex(532.125 + 10i)
case Complex128:
v.SetComplex(564.25 + 1i)
case String:
v.SetString("stringy cheese")
case Bool:
v.SetBool(true)
}
s := valueToString(v)
if s != tt.s {
t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
}
}
}
func TestSetValue(t *testing.T) {
for i, tt := range valueTests {
v := ValueOf(tt.i).Elem()
switch v.Kind() {
case Int:
v.Set(ValueOf(int(132)))
case Int8:
v.Set(ValueOf(int8(8)))
case Int16:
v.Set(ValueOf(int16(16)))
case Int32:
v.Set(ValueOf(int32(32)))
case Int64:
v.Set(ValueOf(int64(64)))
case Uint:
v.Set(ValueOf(uint(132)))
case Uint8:
v.Set(ValueOf(uint8(8)))
case Uint16:
v.Set(ValueOf(uint16(16)))
case Uint32:
v.Set(ValueOf(uint32(32)))
case Uint64:
v.Set(ValueOf(uint64(64)))
case Float32:
v.Set(ValueOf(float32(256.25)))
case Float64:
v.Set(ValueOf(512.125))
case Complex64:
v.Set(ValueOf(complex64(532.125 + 10i)))
case Complex128:
v.Set(ValueOf(complex128(564.25 + 1i)))
case String:
v.Set(ValueOf("stringy cheese"))
case Bool:
v.Set(ValueOf(true))
}
s := valueToString(v)
if s != tt.s {
t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
}
}
}
func TestMapIterSet(t *testing.T) {
m := make(map[string]any, len(valueTests))
for _, tt := range valueTests {
m[tt.s] = tt.i
}
v := ValueOf(m)
k := New(v.Type().Key()).Elem()
e := New(v.Type().Elem()).Elem()
iter := v.MapRange()
for iter.Next() {
k.SetIterKey(iter)
e.SetIterValue(iter)
want := m[k.String()]
got := e.Interface()
if got != want {
t.Errorf("%q: want (%T) %v, got (%T) %v", k.String(), want, want, got, got)
}
if setkey, key := valueToString(k), valueToString(iter.Key()); setkey != key {
t.Errorf("MapIter.Key() = %q, MapIter.SetKey() = %q", key, setkey)
}
if setval, val := valueToString(e), valueToString(iter.Value()); setval != val {
t.Errorf("MapIter.Value() = %q, MapIter.SetValue() = %q", val, setval)
}
}
if strings.HasSuffix(testenv.Builder(), "-noopt") {
return // no inlining with the noopt builder
}
got := int(testing.AllocsPerRun(10, func() {
iter := v.MapRange()
for iter.Next() {
k.SetIterKey(iter)
e.SetIterValue(iter)
}
}))
// Calling MapRange should not allocate even though it returns a *MapIter.
// The function is inlineable, so if the local usage does not escape
// the *MapIter, it can remain stack allocated.
want := 0
if got != want {
t.Errorf("wanted %d alloc, got %d", want, got)
}
}
func TestCanIntUintFloatComplex(t *testing.T) {
type integer int
type uinteger uint
type float float64
type complex complex128
var ops = [...]string{"CanInt", "CanUint", "CanFloat", "CanComplex"}
var testCases = []struct {
i any
want [4]bool
}{
// signed integer
{132, [...]bool{true, false, false, false}},
{int8(8), [...]bool{true, false, false, false}},
{int16(16), [...]bool{true, false, false, false}},
{int32(32), [...]bool{true, false, false, false}},
{int64(64), [...]bool{true, false, false, false}},
// unsigned integer
{uint(132), [...]bool{false, true, false, false}},
{uint8(8), [...]bool{false, true, false, false}},
{uint16(16), [...]bool{false, true, false, false}},
{uint32(32), [...]bool{false, true, false, false}},
{uint64(64), [...]bool{false, true, false, false}},
{uintptr(0xABCD), [...]bool{false, true, false, false}},
// floating-point
{float32(256.25), [...]bool{false, false, true, false}},
{float64(512.125), [...]bool{false, false, true, false}},
// complex
{complex64(532.125 + 10i), [...]bool{false, false, false, true}},
{complex128(564.25 + 1i), [...]bool{false, false, false, true}},
// underlying
{integer(-132), [...]bool{true, false, false, false}},
{uinteger(132), [...]bool{false, true, false, false}},
{float(256.25), [...]bool{false, false, true, false}},
{complex(532.125 + 10i), [...]bool{false, false, false, true}},
// not-acceptable
{"hello world", [...]bool{false, false, false, false}},
{new(int), [...]bool{false, false, false, false}},
{new(uint), [...]bool{false, false, false, false}},
{new(float64), [...]bool{false, false, false, false}},
{new(complex64), [...]bool{false, false, false, false}},
{new([5]int), [...]bool{false, false, false, false}},
{new(integer), [...]bool{false, false, false, false}},
{new(map[int]int), [...]bool{false, false, false, false}},
{new(chan<- int), [...]bool{false, false, false, false}},
{new(func(a int8)), [...]bool{false, false, false, false}},
{new(struct{ i int }), [...]bool{false, false, false, false}},
}
for i, tc := range testCases {
v := ValueOf(tc.i)
got := [...]bool{v.CanInt(), v.CanUint(), v.CanFloat(), v.CanComplex()}
for j := range tc.want {
if got[j] != tc.want[j] {
t.Errorf(
"#%d: v.%s() returned %t for type %T, want %t",
i,
ops[j],
got[j],
tc.i,
tc.want[j],
)
}
}
}
}
func TestCanSetField(t *testing.T) {
type embed struct{ x, X int }
type Embed struct{ x, X int }
type S1 struct {
embed
x, X int
}
type S2 struct {
*embed
x, X int
}
type S3 struct {
Embed
x, X int
}
type S4 struct {
*Embed
x, X int
}
type testCase struct {
// -1 means Addr().Elem() of current value
index []int
canSet bool
}
tests := []struct {
val Value
cases []testCase
}{{
val: ValueOf(&S1{}),
cases: []testCase{
{[]int{0}, false},
{[]int{0, -1}, false},
{[]int{0, 0}, false},
{[]int{0, 0, -1}, false},
{[]int{0, -1, 0}, false},
{[]int{0, -1, 0, -1}, false},
{[]int{0, 1}, true},
{[]int{0, 1, -1}, true},
{[]int{0, -1, 1}, true},
{[]int{0, -1, 1, -1}, true},
{[]int{1}, false},
{[]int{1, -1}, false},
{[]int{2}, true},
{[]int{2, -1}, true},
},
}, {
val: ValueOf(&S2{embed: &embed{}}),
cases: []testCase{
{[]int{0}, false},
{[]int{0, -1}, false},
{[]int{0, 0}, false},
{[]int{0, 0, -1}, false},
{[]int{0, -1, 0}, false},
{[]int{0, -1, 0, -1}, false},
{[]int{0, 1}, true},
{[]int{0, 1, -1}, true},
{[]int{0, -1, 1}, true},
{[]int{0, -1, 1, -1}, true},
{[]int{1}, false},
{[]int{2}, true},
},
}, {
val: ValueOf(&S3{}),
cases: []testCase{
{[]int{0}, true},
{[]int{0, -1}, true},
{[]int{0, 0}, false},
{[]int{0, 0, -1}, false},
{[]int{0, -1, 0}, false},
{[]int{0, -1, 0, -1}, false},
{[]int{0, 1}, true},
{[]int{0, 1, -1}, true},
{[]int{0, -1, 1}, true},
{[]int{0, -1, 1, -1}, true},
{[]int{1}, false},
{[]int{2}, true},
},
}, {
val: ValueOf(&S4{Embed: &Embed{}}),
cases: []testCase{
{[]int{0}, true},
{[]int{0, -1}, true},
{[]int{0, 0}, false},
{[]int{0, 0, -1}, false},
{[]int{0, -1, 0}, false},
{[]int{0, -1, 0, -1}, false},
{[]int{0, 1}, true},
{[]int{0, 1, -1}, true},
{[]int{0, -1, 1}, true},
{[]int{0, -1, 1, -1}, true},
{[]int{1}, false},
{[]int{2}, true},
},
}}
for _, tt := range tests {
t.Run(tt.val.Type().Name(), func(t *testing.T) {
for _, tc := range tt.cases {
f := tt.val
for _, i := range tc.index {
if f.Kind() == Pointer {
f = f.Elem()
}
if i == -1 {
f = f.Addr().Elem()
} else {
f = f.Field(i)
}
}
if got := f.CanSet(); got != tc.canSet {
t.Errorf("CanSet() = %v, want %v", got, tc.canSet)
}
}
})
}
}
var _i = 7
var valueToStringTests = []pair{
{123, "123"},
{123.5, "123.5"},
{byte(123), "123"},
{"abc", "abc"},
{T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"},
{new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"},
{[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
{&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[10]int(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
{&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
}
func TestValueToString(t *testing.T) {
for i, test := range valueToStringTests {
s := valueToString(ValueOf(test.i))
if s != test.s {
t.Errorf("#%d: have %#q, want %#q", i, s, test.s)
}
}
}
func TestArrayElemSet(t *testing.T) {
v := ValueOf(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}).Elem()
v.Index(4).SetInt(123)
s := valueToString(v)
const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
if s != want {
t.Errorf("[10]int: have %#q want %#q", s, want)
}
v = ValueOf([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
v.Index(4).SetInt(123)
s = valueToString(v)
const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
if s != want1 {
t.Errorf("[]int: have %#q want %#q", s, want1)
}
}
func TestPtrPointTo(t *testing.T) {
var ip *int32
var i int32 = 1234
vip := ValueOf(&ip)
vi := ValueOf(&i).Elem()
vip.Elem().Set(vi.Addr())
if *ip != 1234 {
t.Errorf("got %d, want 1234", *ip)
}
ip = nil
vp := ValueOf(&ip).Elem()
vp.Set(Zero(vp.Type()))
if ip != nil {
t.Errorf("got non-nil (%p), want nil", ip)
}
}
func TestPtrSetNil(t *testing.T) {
var i int32 = 1234
ip := &i
vip := ValueOf(&ip)
vip.Elem().Set(Zero(vip.Elem().Type()))
if ip != nil {
t.Errorf("got non-nil (%d), want nil", *ip)
}
}
func TestMapSetNil(t *testing.T) {
m := make(map[string]int)
vm := ValueOf(&m)
vm.Elem().Set(Zero(vm.Elem().Type()))
if m != nil {
t.Errorf("got non-nil (%p), want nil", m)
}
}
func TestAll(t *testing.T) {
testType(t, 1, TypeOf((int8)(0)), "int8")
testType(t, 2, TypeOf((*int8)(nil)).Elem(), "int8")
typ := TypeOf((*struct {
c chan *int32
d float32
})(nil))
testType(t, 3, typ, "*struct { c chan *int32; d float32 }")
etyp := typ.Elem()
testType(t, 4, etyp, "struct { c chan *int32; d float32 }")
styp := etyp
f := styp.Field(0)
testType(t, 5, f.Type, "chan *int32")
f, present := styp.FieldByName("d")
if !present {
t.Errorf("FieldByName says present field is absent")
}
testType(t, 6, f.Type, "float32")
f, present = styp.FieldByName("absent")
if present {
t.Errorf("FieldByName says absent field is present")
}
typ = TypeOf([32]int32{})
testType(t, 7, typ, "[32]int32")
testType(t, 8, typ.Elem(), "int32")
typ = TypeOf((map[string]*int32)(nil))
testType(t, 9, typ, "map[string]*int32")
mtyp := typ
testType(t, 10, mtyp.Key(), "string")
testType(t, 11, mtyp.Elem(), "*int32")
typ = TypeOf((chan<- string)(nil))
testType(t, 12, typ, "chan<- string")
testType(t, 13, typ.Elem(), "string")
// make sure tag strings are not part of element type
typ = TypeOf(struct {
d []uint32 `reflect:"TAG"`
}{}).Field(0).Type
testType(t, 14, typ, "[]uint32")
}
func TestInterfaceGet(t *testing.T) {
var inter struct {
E any
}
inter.E = 123.456
v1 := ValueOf(&inter)
v2 := v1.Elem().Field(0)
assert(t, v2.Type().String(), "interface {}")
i2 := v2.Interface()
v3 := ValueOf(i2)
assert(t, v3.Type().String(), "float64")
}
func TestInterfaceValue(t *testing.T) {
var inter struct {
E any
}
inter.E = 123.456
v1 := ValueOf(&inter)
v2 := v1.Elem().Field(0)
assert(t, v2.Type().String(), "interface {}")
v3 := v2.Elem()
assert(t, v3.Type().String(), "float64")
i3 := v2.Interface()
if _, ok := i3.(float64); !ok {
t.Error("v2.Interface() did not return float64, got ", TypeOf(i3))
}
}
func TestFunctionValue(t *testing.T) {
var x any = func() {}
v := ValueOf(x)
if fmt.Sprint(v.Interface()) != fmt.Sprint(x) {
t.Fatalf("TestFunction returned wrong pointer")
}
assert(t, v.Type().String(), "func()")
}
var appendTests = []struct {
orig, extra []int
}{
{make([]int, 2, 4), []int{22}},
{make([]int, 2, 4), []int{22, 33, 44}},
}
func sameInts(x, y []int) bool {
if len(x) != len(y) {
return false
}
for i, xx := range x {
if xx != y[i] {
return false
}
}
return true
}
func TestAppend(t *testing.T) {
for i, test := range appendTests {
origLen, extraLen := len(test.orig), len(test.extra)
want := append(test.orig, test.extra...)
// Convert extra from []int to []Value.
e0 := make([]Value, len(test.extra))
for j, e := range test.extra {
e0[j] = ValueOf(e)
}
// Convert extra from []int to *SliceValue.
e1 := ValueOf(test.extra)
// Test Append.
a0 := ValueOf(test.orig)
have0 := Append(a0, e0...).Interface().([]int)
if !sameInts(have0, want) {
t.Errorf("Append #%d: have %v, want %v (%p %p)", i, have0, want, test.orig, have0)
}
// Check that the orig and extra slices were not modified.
if len(test.orig) != origLen {
t.Errorf("Append #%d origLen: have %v, want %v", i, len(test.orig), origLen)
}
if len(test.extra) != extraLen {
t.Errorf("Append #%d extraLen: have %v, want %v", i, len(test.extra), extraLen)
}
// Test AppendSlice.
a1 := ValueOf(test.orig)
have1 := AppendSlice(a1, e1).Interface().([]int)
if !sameInts(have1, want) {
t.Errorf("AppendSlice #%d: have %v, want %v", i, have1, want)
}
// Check that the orig and extra slices were not modified.
if len(test.orig) != origLen {
t.Errorf("AppendSlice #%d origLen: have %v, want %v", i, len(test.orig), origLen)
}
if len(test.extra) != extraLen {
t.Errorf("AppendSlice #%d extraLen: have %v, want %v", i, len(test.extra), extraLen)
}
}
}
func TestCopy(t *testing.T) {
a := []int{1, 2, 3, 4, 10, 9, 8, 7}
b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
for i := 0; i < len(b); i++ {
if b[i] != c[i] {
t.Fatalf("b != c before test")
}
}
a1 := a
b1 := b
aa := ValueOf(&a1).Elem()
ab := ValueOf(&b1).Elem()
for tocopy := 1; tocopy <= 7; tocopy++ {
aa.SetLen(tocopy)
Copy(ab, aa)
aa.SetLen(8)
for i := 0; i < tocopy; i++ {
if a[i] != b[i] {
t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d",
tocopy, i, a[i], i, b[i])
}
}
for i := tocopy; i < len(b); i++ {
if b[i] != c[i] {
if i < len(a) {
t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d",
tocopy, i, a[i], i, b[i], i, c[i])
} else {
t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d",
tocopy, i, b[i], i, c[i])
}
} else {
t.Logf("tocopy=%d elem %d is okay\n", tocopy, i)
}
}
}
}
func TestCopyString(t *testing.T) {
t.Run("Slice", func(t *testing.T) {
s := bytes.Repeat([]byte{'_'}, 8)
val := ValueOf(s)
n := Copy(val, ValueOf(""))
if expecting := []byte("________"); n != 0 || !bytes.Equal(s, expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s, expecting)
}
n = Copy(val, ValueOf("hello"))
if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s, expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s, expecting)
}
n = Copy(val, ValueOf("helloworld"))
if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s, expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s, expecting)
}
})
t.Run("Array", func(t *testing.T) {
s := [...]byte{'_', '_', '_', '_', '_', '_', '_', '_'}
val := ValueOf(&s).Elem()
n := Copy(val, ValueOf(""))
if expecting := []byte("________"); n != 0 || !bytes.Equal(s[:], expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s[:], expecting)
}
n = Copy(val, ValueOf("hello"))
if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s[:], expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s[:], expecting)
}
n = Copy(val, ValueOf("helloworld"))
if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s[:], expecting) {
t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s[:], expecting)
}
})
}
func TestCopyArray(t *testing.T) {
a := [8]int{1, 2, 3, 4, 10, 9, 8, 7}
b := [11]int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
c := b
aa := ValueOf(&a).Elem()
ab := ValueOf(&b).Elem()
Copy(ab, aa)
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
t.Errorf("(i) a[%d]=%d, b[%d]=%d", i, a[i], i, b[i])
}
}
for i := len(a); i < len(b); i++ {
if b[i] != c[i] {
t.Errorf("(ii) b[%d]=%d, c[%d]=%d", i, b[i], i, c[i])
} else {
t.Logf("elem %d is okay\n", i)
}
}
}
func TestBigUnnamedStruct(t *testing.T) {
b := struct{ a, b, c, d int64 }{1, 2, 3, 4}
v := ValueOf(b)
b1 := v.Interface().(struct {
a, b, c, d int64
})
if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d {
t.Errorf("ValueOf(%v).Interface().(*Big) = %v", b, b1)
}
}
type big struct {
a, b, c, d, e int64
}
func TestBigStruct(t *testing.T) {
b := big{1, 2, 3, 4, 5}
v := ValueOf(b)
b1 := v.Interface().(big)
if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e {
t.Errorf("ValueOf(%v).Interface().(big) = %v", b, b1)
}
}
type Basic struct {
x int
y float32
}
type NotBasic Basic
type DeepEqualTest struct {
a, b any
eq bool
}
// Simple functions for DeepEqual tests.
var (
fn1 func() // nil.
fn2 func() // nil.
fn3 = func() { fn1() } // Not nil.
)
type self struct{}
type Loop *Loop
type Loopy any
var loop1, loop2 Loop
var loopy1, loopy2 Loopy
var cycleMap1, cycleMap2, cycleMap3 map[string]any
type structWithSelfPtr struct {
p *structWithSelfPtr
s string
}
func init() {
loop1 = &loop2
loop2 = &loop1
loopy1 = &loopy2
loopy2 = &loopy1
cycleMap1 = map[string]any{}
cycleMap1["cycle"] = cycleMap1
cycleMap2 = map[string]any{}
cycleMap2["cycle"] = cycleMap2
cycleMap3 = map[string]any{}
cycleMap3["different"] = cycleMap3
}
var deepEqualTests = []DeepEqualTest{
// Equalities
{nil, nil, true},
{1, 1, true},
{int32(1), int32(1), true},
{0.5, 0.5, true},
{float32(0.5), float32(0.5), true},
{"hello", "hello", true},
{make([]int, 10), make([]int, 10), true},
{&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true},
{Basic{1, 0.5}, Basic{1, 0.5}, true},
{error(nil), error(nil), true},
{map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true},
{fn1, fn2, true},
{[]byte{1, 2, 3}, []byte{1, 2, 3}, true},
{[]MyByte{1, 2, 3}, []MyByte{1, 2, 3}, true},
{MyBytes{1, 2, 3}, MyBytes{1, 2, 3}, true},
// Inequalities
{1, 2, false},
{int32(1), int32(2), false},
{0.5, 0.6, false},
{float32(0.5), float32(0.6), false},
{"hello", "hey", false},
{make([]int, 10), make([]int, 11), false},
{&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false},
{Basic{1, 0.5}, Basic{1, 0.6}, false},
{Basic{1, 0}, Basic{2, 0}, false},
{map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false},
{map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false},