blob: 9a41b504a743a89e990ace4c5517a945f19b014c [file] [log] [blame]
// 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"
"container/vector"
"fmt"
"io"
"os"
. "reflect"
"runtime"
"testing"
"unsafe"
)
type integer int
type T struct {
a int
b float64
c string
d *int
}
type pair struct {
i interface{}
s string
}
func isDigit(c uint8) bool { return '0' <= c && c <= '9' }
func assert(t *testing.T, s, want string) {
if s != want {
t.Errorf("have %#q want %#q", s, want)
}
}
func typestring(i interface{}) string { return TypeOf(i).String() }
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 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() }",
},
}
var valueTests = []pair{
{new(int8), "8"},
{new(int16), "16"},
{new(int32), "32"},
{new(int64), "64"},
{new(uint8), "8"},
{new(uint16), "16"},
{new(uint32), "32"},
{new(uint64), "64"},
{new(float32), "256.25"},
{new(float64), "512.125"},
{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).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)
}
}
}
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 interface{}
}
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 interface{}
}
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 interface{} = func() {}
v := ValueOf(x)
if v.Interface() != v.Interface() || v.Interface() != x {
t.Fatalf("TestFunction != itself")
}
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 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 interface{}
eq bool
}
var deepEqualTests = []DeepEqualTest{
// Equalities
{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},
{os.Error(nil), os.Error(nil), true},
{map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, 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},
{map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false},
{map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false},
{nil, 1, false},
{1, nil, false},
// Mismatched types
{1, 1.0, false},
{int32(1), int64(1), false},
{0.5, "hello", false},
{[]int{1, 2, 3}, [3]int{1, 2, 3}, false},
{&[3]interface{}{1, 2, 4}, &[3]interface{}{1, 2, "s"}, false},
{Basic{1, 0.5}, NotBasic{1, 0.5}, false},
{map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false},
}
func TestDeepEqual(t *testing.T) {
for _, test := range deepEqualTests {
if r := DeepEqual(test.a, test.b); r != test.eq {
t.Errorf("DeepEqual(%v, %v) = %v, want %v", test.a, test.b, r, test.eq)
}
}
}
func TestTypeOf(t *testing.T) {
for _, test := range deepEqualTests {
v := ValueOf(test.a)
if !v.IsValid() {
continue
}
typ := TypeOf(test.a)
if typ != v.Type() {
t.Errorf("TypeOf(%v) = %v, but ValueOf(%v).Type() = %v", test.a, typ, test.a, v.Type())
}
}
}
type Recursive struct {
x int
r *Recursive
}
func TestDeepEqualRecursiveStruct(t *testing.T) {
a, b := new(Recursive), new(Recursive)
*a = Recursive{12, a}
*b = Recursive{12, b}
if !DeepEqual(a, b) {
t.Error("DeepEqual(recursive same) = false, want true")
}
}
type _Complex struct {
a int
b [3]*_Complex
c *string
d map[float64]float64
}
func TestDeepEqualComplexStruct(t *testing.T) {
m := make(map[float64]float64)
stra, strb := "hello", "hello"
a, b := new(_Complex), new(_Complex)
*a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
*b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
if !DeepEqual(a, b) {
t.Error("DeepEqual(complex same) = false, want true")
}
}
func TestDeepEqualComplexStructInequality(t *testing.T) {
m := make(map[float64]float64)
stra, strb := "hello", "helloo" // Difference is here
a, b := new(_Complex), new(_Complex)
*a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
*b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
if DeepEqual(a, b) {
t.Error("DeepEqual(complex different) = true, want false")
}
}
type UnexpT struct {
m map[int]int
}
func TestDeepEqualUnexportedMap(t *testing.T) {
// Check that DeepEqual can look at unexported fields.
x1 := UnexpT{map[int]int{1: 2}}
x2 := UnexpT{map[int]int{1: 2}}
if !DeepEqual(&x1, &x2) {
t.Error("DeepEqual(x1, x2) = false, want true")
}
y1 := UnexpT{map[int]int{2: 3}}
if DeepEqual(&x1, &y1) {
t.Error("DeepEqual(x1, y1) = true, want false")
}
}
func check2ndField(x interface{}, offs uintptr, t *testing.T) {
s := ValueOf(x)
f := s.Type().Field(1)
if f.Offset != offs {
t.Error("mismatched offsets in structure alignment:", f.Offset, offs)
}
}
// Check that structure alignment & offsets viewed through reflect agree with those
// from the compiler itself.
func TestAlignment(t *testing.T) {
type T1inner struct {
a int
}
type T1 struct {
T1inner
f int
}
type T2inner struct {
a, b int
}
type T2 struct {
T2inner
f int
}
x := T1{T1inner{2}, 17}
check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t)
x1 := T2{T2inner{2, 3}, 17}
check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t)
}
func Nil(a interface{}, t *testing.T) {
n := ValueOf(a).Field(0)
if !n.IsNil() {
t.Errorf("%v should be nil", a)
}
}
func NotNil(a interface{}, t *testing.T) {
n := ValueOf(a).Field(0)
if n.IsNil() {
t.Errorf("value of type %v should not be nil", ValueOf(a).Type().String())
}
}
func TestIsNil(t *testing.T) {
// These implement IsNil.
// Wrap in extra struct to hide interface type.
doNil := []interface{}{
struct{ x *int }{},
struct{ x interface{} }{},
struct{ x map[string]int }{},
struct{ x func() bool }{},
struct{ x chan int }{},
struct{ x []string }{},
}
for _, ts := range doNil {
ty := TypeOf(ts).Field(0).Type
v := Zero(ty)
v.IsNil() // panics if not okay to call
}
// Check the implementations
var pi struct {
x *int
}
Nil(pi, t)
pi.x = new(int)
NotNil(pi, t)
var si struct {
x []int
}
Nil(si, t)
si.x = make([]int, 10)
NotNil(si, t)
var ci struct {
x chan int
}
Nil(ci, t)
ci.x = make(chan int)
NotNil(ci, t)
var mi struct {
x map[int]int
}
Nil(mi, t)
mi.x = make(map[int]int)
NotNil(mi, t)
var ii struct {
x interface{}
}
Nil(ii, t)
ii.x = 2
NotNil(ii, t)
var fi struct {
x func(t *testing.T)
}
Nil(fi, t)
fi.x = TestIsNil
NotNil(fi, t)
}
func TestInterfaceExtraction(t *testing.T) {
var s struct {
W io.Writer
}
s.W = os.Stdout
v := Indirect(ValueOf(&s)).Field(0).Interface()
if v != s.W.(interface{}) {
t.Error("Interface() on interface: ", v, s.W)
}
}
func TestNilPtrValueSub(t *testing.T) {
var pi *int
if pv := ValueOf(pi); pv.Elem().IsValid() {
t.Error("ValueOf((*int)(nil)).Elem().IsValid()")
}
}
func TestMap(t *testing.T) {
m := map[string]int{"a": 1, "b": 2}
mv := ValueOf(m)
if n := mv.Len(); n != len(m) {
t.Errorf("Len = %d, want %d", n, len(m))
}
keys := mv.MapKeys()
i := 0
newmap := MakeMap(mv.Type())
for k, v := range m {
// Check that returned Keys match keys in range.
// These aren't required to be in the same order,
// but they are in this implementation, which makes
// the test easier.
if i >= len(keys) {
t.Errorf("Missing key #%d %q", i, k)
} else if kv := keys[i]; kv.String() != k {
t.Errorf("Keys[%q] = %d, want %d", i, kv.Int(), k)
}
i++
// Check that value lookup is correct.
vv := mv.MapIndex(ValueOf(k))
if vi := vv.Int(); vi != int64(v) {
t.Errorf("Key %q: have value %d, want %d", k, vi, v)
}
// Copy into new map.
newmap.SetMapIndex(ValueOf(k), ValueOf(v))
}
vv := mv.MapIndex(ValueOf("not-present"))
if vv.IsValid() {
t.Errorf("Invalid key: got non-nil value %s", valueToString(vv))
}
newm := newmap.Interface().(map[string]int)
if len(newm) != len(m) {
t.Errorf("length after copy: newm=%d, m=%d", newm, m)
}
for k, v := range newm {
mv, ok := m[k]
if mv != v {
t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok)
}
}
newmap.SetMapIndex(ValueOf("a"), Value{})
v, ok := newm["a"]
if ok {
t.Errorf("newm[\"a\"] = %d after delete", v)
}
mv = ValueOf(&m).Elem()
mv.Set(Zero(mv.Type()))
if m != nil {
t.Errorf("mv.Set(nil) failed")
}
}
func TestChan(t *testing.T) {
for loop := 0; loop < 2; loop++ {
var c chan int
var cv Value
// check both ways to allocate channels
switch loop {
case 1:
c = make(chan int, 1)
cv = ValueOf(c)
case 0:
cv = MakeChan(TypeOf(c), 1)
c = cv.Interface().(chan int)
}
// Send
cv.Send(ValueOf(2))
if i := <-c; i != 2 {
t.Errorf("reflect Send 2, native recv %d", i)
}
// Recv
c <- 3
if i, ok := cv.Recv(); i.Int() != 3 || !ok {
t.Errorf("native send 3, reflect Recv %d, %t", i.Int(), ok)
}
// TryRecv fail
val, ok := cv.TryRecv()
if val.IsValid() || ok {
t.Errorf("TryRecv on empty chan: %s, %t", valueToString(val), ok)
}
// TryRecv success
c <- 4
val, ok = cv.TryRecv()
if !val.IsValid() {
t.Errorf("TryRecv on ready chan got nil")
} else if i := val.Int(); i != 4 || !ok {
t.Errorf("native send 4, TryRecv %d, %t", i, ok)
}
// TrySend fail
c <- 100
ok = cv.TrySend(ValueOf(5))
i := <-c
if ok {
t.Errorf("TrySend on full chan succeeded: value %d", i)
}
// TrySend success
ok = cv.TrySend(ValueOf(6))
if !ok {
t.Errorf("TrySend on empty chan failed")
} else {
if i = <-c; i != 6 {
t.Errorf("TrySend 6, recv %d", i)
}
}
// Close
c <- 123
cv.Close()
if i, ok := cv.Recv(); i.Int() != 123 || !ok {
t.Errorf("send 123 then close; Recv %d, %t", i.Int(), ok)
}
if i, ok := cv.Recv(); i.Int() != 0 || ok {
t.Errorf("after close Recv %d, %t", i.Int(), ok)
}
}
// check creation of unbuffered channel
var c chan int
cv := MakeChan(TypeOf(c), 0)
c = cv.Interface().(chan int)
if cv.TrySend(ValueOf(7)) {
t.Errorf("TrySend on sync chan succeeded")
}
if v, ok := cv.TryRecv(); v.IsValid() || ok {
t.Errorf("TryRecv on sync chan succeeded: isvalid=%v ok=%v", v.IsValid(), ok)
}
// len/cap
cv = MakeChan(TypeOf(c), 10)
c = cv.Interface().(chan int)
for i := 0; i < 3; i++ {
c <- i
}
if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) {
t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c))
}
}
// Difficult test for function call because of
// implicit padding between arguments.
func dummy(b byte, c int, d byte) (i byte, j int, k byte) {
return b, c, d
}
func TestFunc(t *testing.T) {
ret := ValueOf(dummy).Call([]Value{ValueOf(byte(10)), ValueOf(20), ValueOf(byte(30))})
if len(ret) != 3 {
t.Fatalf("Call returned %d values, want 3", len(ret))
}
i := byte(ret[0].Uint())
j := int(ret[1].Int())
k := byte(ret[2].Uint())
if i != 10 || j != 20 || k != 30 {
t.Errorf("Call returned %d, %d, %d; want 10, 20, 30", i, j, k)
}
}
type Point struct {
x, y int
}
// This will be index 0.
func (p Point) AnotherMethod(scale int) int {
return -1
}
// This will be index 1.
func (p Point) Dist(scale int) int {
// println("Point.Dist", p.x, p.y, scale)
return p.x*p.x*scale + p.y*p.y*scale
}
func TestMethod(t *testing.T) {
// Non-curried method of type.
p := Point{3, 4}
i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Type Method returned %d; want 250", i)
}
m, ok := TypeOf(p).MethodByName("Dist")
if !ok {
t.Fatalf("method by name failed")
}
m.Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Type MethodByName returned %d; want 250", i)
}
i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Type Method returned %d; want 250", i)
}
m, ok = TypeOf(&p).MethodByName("Dist")
if !ok {
t.Fatalf("ptr method by name failed")
}
i = m.Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Type MethodByName returned %d; want 250", i)
}
// Curried method of value.
i = ValueOf(p).Method(1).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Value Method returned %d; want 250", i)
}
i = ValueOf(p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Value MethodByName returned %d; want 250", i)
}
// Curried method of pointer.
i = ValueOf(&p).Method(1).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Value Method returned %d; want 250", i)
}
i = ValueOf(&p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Value MethodByName returned %d; want 250", i)
}
// Curried method of interface value.
// Have to wrap interface value in a struct to get at it.
// Passing it to ValueOf directly would
// access the underlying Point, not the interface.
var s = struct {
X interface {
Dist(int) int
}
}{p}
pv := ValueOf(s).Field(0)
i = pv.Method(0).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Interface Method returned %d; want 250", i)
}
i = pv.MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Interface MethodByName returned %d; want 250", i)
}
}
func TestInterfaceSet(t *testing.T) {
p := &Point{3, 4}
var s struct {
I interface{}
P interface {
Dist(int) int
}
}
sv := ValueOf(&s).Elem()
sv.Field(0).Set(ValueOf(p))
if q := s.I.(*Point); q != p {
t.Errorf("i: have %p want %p", q, p)
}
pv := sv.Field(1)
pv.Set(ValueOf(p))
if q := s.P.(*Point); q != p {
t.Errorf("i: have %p want %p", q, p)
}
i := pv.Method(0).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Interface Method returned %d; want 250", i)
}
}
type T1 struct {
a string
int
}
func TestAnonymousFields(t *testing.T) {
var field StructField
var ok bool
var t1 T1
type1 := TypeOf(t1)
if field, ok = type1.FieldByName("int"); !ok {
t.Error("no field 'int'")
}
if field.Index[0] != 1 {
t.Error("field index should be 1; is", field.Index)
}
}
type FTest struct {
s interface{}
name string
index []int
value int
}
type D1 struct {
d int
}
type D2 struct {
d int
}
type S0 struct {
A, B, C int
D1
D2
}
type S1 struct {
B int
S0
}
type S2 struct {
A int
*S1
}
type S1x struct {
S1
}
type S1y struct {
S1
}
type S3 struct {
S1x
S2
D, E int
*S1y
}
type S4 struct {
*S4
A int
}
var fieldTests = []FTest{
{struct{}{}, "", nil, 0},
{struct{}{}, "Foo", nil, 0},
{S0{A: 'a'}, "A", []int{0}, 'a'},
{S0{}, "D", nil, 0},
{S1{S0: S0{A: 'a'}}, "A", []int{1, 0}, 'a'},
{S1{B: 'b'}, "B", []int{0}, 'b'},
{S1{}, "S0", []int{1}, 0},
{S1{S0: S0{C: 'c'}}, "C", []int{1, 2}, 'c'},
{S2{A: 'a'}, "A", []int{0}, 'a'},
{S2{}, "S1", []int{1}, 0},
{S2{S1: &S1{B: 'b'}}, "B", []int{1, 0}, 'b'},
{S2{S1: &S1{S0: S0{C: 'c'}}}, "C", []int{1, 1, 2}, 'c'},
{S2{}, "D", nil, 0},
{S3{}, "S1", nil, 0},
{S3{S2: S2{A: 'a'}}, "A", []int{1, 0}, 'a'},
{S3{}, "B", nil, 0},
{S3{D: 'd'}, "D", []int{2}, 0},
{S3{E: 'e'}, "E", []int{3}, 'e'},
{S4{A: 'a'}, "A", []int{1}, 'a'},
{S4{}, "B", nil, 0},
}
func TestFieldByIndex(t *testing.T) {
for _, test := range fieldTests {
s := TypeOf(test.s)
f := s.FieldByIndex(test.index)
if f.Name != "" {
if test.index != nil {
if f.Name != test.name {
t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name)
}
} else {
t.Errorf("%s.%s found", s.Name(), f.Name)
}
} else if len(test.index) > 0 {
t.Errorf("%s.%s not found", s.Name(), test.name)
}
if test.value != 0 {
v := ValueOf(test.s).FieldByIndex(test.index)
if v.IsValid() {
if x, ok := v.Interface().(int); ok {
if x != test.value {
t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value)
}
} else {
t.Errorf("%s%v value not an int", s.Name(), test.index)
}
} else {
t.Errorf("%s%v value not found", s.Name(), test.index)
}
}
}
}
func TestFieldByName(t *testing.T) {
for _, test := range fieldTests {
s := TypeOf(test.s)
f, found := s.FieldByName(test.name)
if found {
if test.index != nil {
// Verify field depth and index.
if len(f.Index) != len(test.index) {
t.Errorf("%s.%s depth %d; want %d", s.Name(), test.name, len(f.Index), len(test.index))
} else {
for i, x := range f.Index {
if x != test.index[i] {
t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i])
}
}
}
} else {
t.Errorf("%s.%s found", s.Name(), f.Name)
}
} else if len(test.index) > 0 {
t.Errorf("%s.%s not found", s.Name(), test.name)
}
if test.value != 0 {
v := ValueOf(test.s).FieldByName(test.name)
if v.IsValid() {
if x, ok := v.Interface().(int); ok {
if x != test.value {
t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value)
}
} else {
t.Errorf("%s.%s value not an int", s.Name(), test.name)
}
} else {
t.Errorf("%s.%s value not found", s.Name(), test.name)
}
}
}
}
func TestImportPath(t *testing.T) {
if path := TypeOf(vector.Vector{}).PkgPath(); path != "container/vector" {
t.Errorf("TypeOf(vector.Vector{}).PkgPath() = %q, want \"container/vector\"", path)
}
}
func TestVariadicType(t *testing.T) {
// Test example from Type documentation.
var f func(x int, y ...float64)
typ := TypeOf(f)
if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) {
sl := typ.In(1)
if sl.Kind() == Slice {
if sl.Elem() == TypeOf(0.0) {
// ok
return
}
}
}
// Failed
t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64")
s := fmt.Sprintf("have NumIn() = %d", typ.NumIn())
for i := 0; i < typ.NumIn(); i++ {
s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i))
}
t.Error(s)
}
type inner struct {
x int
}
type outer struct {
y int
inner
}
func (*inner) m() {}
func (*outer) m() {}
func TestNestedMethods(t *testing.T) {
typ := TypeOf((*outer)(nil))
if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*outer).m).Pointer() {
t.Errorf("Wrong method table for outer: (m=%p)", (*outer).m)
for i := 0; i < typ.NumMethod(); i++ {
m := typ.Method(i)
t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer())
}
}
}
type InnerInt struct {
X int
}
type OuterInt struct {
Y int
InnerInt
}
func (i *InnerInt) M() int {
return i.X
}
func TestEmbeddedMethods(t *testing.T) {
typ := TypeOf((*OuterInt)(nil))
if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*OuterInt).M).Pointer() {
t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M)
for i := 0; i < typ.NumMethod(); i++ {
m := typ.Method(i)
t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer())
}
}
i := &InnerInt{3}
if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 {
t.Errorf("i.M() = %d, want 3", v)
}
o := &OuterInt{1, InnerInt{2}}
if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 {
t.Errorf("i.M() = %d, want 2", v)
}
f := (*OuterInt).M
if v := f(o); v != 2 {
t.Errorf("f(o) = %d, want 2", v)
}
}
func TestPtrTo(t *testing.T) {
var i int
typ := TypeOf(i)
for i = 0; i < 100; i++ {
typ = PtrTo(typ)
}
for i = 0; i < 100; i++ {
typ = typ.Elem()
}
if typ != TypeOf(i) {
t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(i))
}
}
func TestAddr(t *testing.T) {
var p struct {
X, Y int
}
v := ValueOf(&p)
v = v.Elem()
v = v.Addr()
v = v.Elem()
v = v.Field(0)
v.SetInt(2)
if p.X != 2 {
t.Errorf("Addr.Elem.Set failed to set value")
}
// Again but take address of the ValueOf value.
// Exercises generation of PtrTypes not present in the binary.
q := &p
v = ValueOf(&q).Elem()
v = v.Addr()
v = v.Elem()
v = v.Elem()
v = v.Addr()
v = v.Elem()
v = v.Field(0)
v.SetInt(3)
if p.X != 3 {
t.Errorf("Addr.Elem.Set failed to set value")
}
// Starting without pointer we should get changed value
// in interface.
qq := p
v = ValueOf(&qq).Elem()
v0 := v
v = v.Addr()
v = v.Elem()
v = v.Field(0)
v.SetInt(4)
if p.X != 3 { // should be unchanged from last time
t.Errorf("somehow value Set changed original p")
}
p = v0.Interface().(struct {
X, Y int
})
if p.X != 4 {
t.Errorf("Addr.Elem.Set valued to set value in top value")
}
}
func noAlloc(t *testing.T, n int, f func(int)) {
// once to prime everything
f(-1)
runtime.MemStats.Mallocs = 0
for j := 0; j < n; j++ {
f(j)
}
// A few allocs may happen in the testing package when GOMAXPROCS > 1, so don't
// require zero mallocs.
if runtime.MemStats.Mallocs > 5 {
t.Fatalf("%d mallocs after %d iterations", runtime.MemStats.Mallocs, n)
}
}
func TestAllocations(t *testing.T) {
noAlloc(t, 100, func(j int) {
var i interface{}
var v Value
i = 42 + j
v = ValueOf(i)
if int(v.Int()) != 42+j {
panic("wrong int")
}
})
}
func TestSmallNegativeInt(t *testing.T) {
i := int16(-1)
v := ValueOf(i)
if v.Int() != -1 {
t.Errorf("int16(-1).Int() returned %v", v.Int())
}
}
func TestSlice(t *testing.T) {
xs := []int{1, 2, 3, 4, 5, 6, 7, 8}
v := ValueOf(xs).Slice(3, 5).Interface().([]int)
if len(v) != 2 || v[0] != 4 || v[1] != 5 {
t.Errorf("xs.Slice(3, 5) = %v", v)
}
xa := [7]int{10, 20, 30, 40, 50, 60, 70}
v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int)
if len(v) != 3 || v[0] != 30 || v[1] != 40 || v[2] != 50 {
t.Errorf("xa.Slice(2, 5) = %v", v)
}
}
func TestVariadic(t *testing.T) {
var b bytes.Buffer
V := ValueOf
b.Reset()
V(fmt.Fprintf).Call([]Value{V(&b), V("%s, %d world"), V("hello"), V(42)})
if b.String() != "hello, 42 world" {
t.Errorf("after Fprintf Call: %q != %q", b.String(), "hello 42 world")
}
b.Reset()
V(fmt.Fprintf).CallSlice([]Value{V(&b), V("%s, %d world"), V([]interface{}{"hello", 42})})
if b.String() != "hello, 42 world" {
t.Errorf("after Fprintf CallSlice: %q != %q", b.String(), "hello 42 world")
}
}
var tagGetTests = []struct {
Tag StructTag
Key string
Value string
}{
{`protobuf:"PB(1,2)"`, `protobuf`, `PB(1,2)`},
{`protobuf:"PB(1,2)"`, `foo`, ``},
{`protobuf:"PB(1,2)"`, `rotobuf`, ``},
{`protobuf:"PB(1,2)" json:"name"`, `json`, `name`},
{`protobuf:"PB(1,2)" json:"name"`, `protobuf`, `PB(1,2)`},
}
func TestTagGet(t *testing.T) {
for _, tt := range tagGetTests {
if v := tt.Tag.Get(tt.Key); v != tt.Value {
t.Errorf("StructTag(%#q).Get(%#q) = %#q, want %#q", tt.Tag, tt.Key, v, tt.Value)
}
}
}
type Private struct {
x int
y **int
}
func (p *Private) m() {
}
type Public struct {
X int
Y **int
}
func (p *Public) M() {
}
func TestUnexported(t *testing.T) {
var pub Public
v := ValueOf(&pub)
isValid(v.Elem().Field(0))
isValid(v.Elem().Field(1))
isValid(v.Elem().FieldByName("X"))
isValid(v.Elem().FieldByName("Y"))
isValid(v.Type().Method(0).Func)
isNonNil(v.Elem().Field(0).Interface())
isNonNil(v.Elem().Field(1).Interface())
isNonNil(v.Elem().FieldByName("X").Interface())
isNonNil(v.Elem().FieldByName("Y").Interface())
isNonNil(v.Type().Method(0).Func.Interface())
var priv Private
v = ValueOf(&priv)
isValid(v.Elem().Field(0))
isValid(v.Elem().Field(1))
isValid(v.Elem().FieldByName("x"))
isValid(v.Elem().FieldByName("y"))
isValid(v.Type().Method(0).Func)
shouldPanic(func() { v.Elem().Field(0).Interface() })
shouldPanic(func() { v.Elem().Field(1).Interface() })
shouldPanic(func() { v.Elem().FieldByName("x").Interface() })
shouldPanic(func() { v.Elem().FieldByName("y").Interface() })
shouldPanic(func() { v.Type().Method(0).Func.Interface() })
}
func shouldPanic(f func()) {
defer func() {
if recover() == nil {
panic("did not panic")
}
}()
f()
}
func isNonNil(x interface{}) {
if x == nil {
panic("nil interface")
}
}
func isValid(v Value) {
if !v.IsValid() {
panic("zero Value")
}
}