Source file
src/reflect/type_test.go
Documentation: reflect
1
2
3
4
5 package reflect_test
6
7 import (
8 "reflect"
9 "testing"
10 )
11
12 func TestTypeFor(t *testing.T) {
13 type (
14 mystring string
15 myiface interface{}
16 )
17
18 testcases := []struct {
19 wantFrom any
20 got reflect.Type
21 }{
22 {new(int), reflect.TypeFor[int]()},
23 {new(int64), reflect.TypeFor[int64]()},
24 {new(string), reflect.TypeFor[string]()},
25 {new(mystring), reflect.TypeFor[mystring]()},
26 {new(any), reflect.TypeFor[any]()},
27 {new(myiface), reflect.TypeFor[myiface]()},
28 }
29 for _, tc := range testcases {
30 want := reflect.ValueOf(tc.wantFrom).Elem().Type()
31 if want != tc.got {
32 t.Errorf("unexpected reflect.Type: got %v; want %v", tc.got, want)
33 }
34 }
35 }
36
37 func TestStructOfEmbeddedIfaceMethodCall(t *testing.T) {
38 type Named interface {
39 Name() string
40 }
41
42 typ := reflect.StructOf([]reflect.StructField{
43 {
44 Anonymous: true,
45 Name: "Named",
46 Type: reflect.TypeFor[Named](),
47 },
48 })
49
50 v := reflect.New(typ).Elem()
51 v.Field(0).Set(
52 reflect.ValueOf(reflect.TypeFor[string]()),
53 )
54
55 x := v.Interface().(Named)
56 shouldPanic("StructOf does not support methods of embedded interfaces", func() {
57 _ = x.Name()
58 })
59 }
60
61 func TestIsRegularMemory(t *testing.T) {
62 type args struct {
63 t reflect.Type
64 }
65 type S struct {
66 int
67 }
68 tests := []struct {
69 name string
70 args args
71 want bool
72 }{
73 {"struct{i int}", args{reflect.TypeOf(struct{ i int }{})}, true},
74 {"struct{}", args{reflect.TypeOf(struct{}{})}, true},
75 {"struct{i int; s S}", args{reflect.TypeOf(struct {
76 i int
77 s S
78 }{})}, true},
79 {"map[int][int]", args{reflect.TypeOf(map[int]int{})}, false},
80 {"[4]chan int", args{reflect.TypeOf([4]chan int{})}, true},
81 {"[0]struct{_ S}", args{reflect.TypeOf([0]struct {
82 _ S
83 }{})}, true},
84 {"struct{i int; _ S}", args{reflect.TypeOf(struct {
85 i int
86 _ S
87 }{})}, false},
88 {"struct{a int16; b int32}", args{reflect.TypeOf(struct {
89 a int16
90 b int32
91 }{})}, false},
92 {"struct {x int32; y int16}", args{reflect.TypeOf(struct {
93 x int32
94 y int16
95 }{})}, false},
96 {"struct {_ int32 }", args{reflect.TypeOf(struct{ _ int32 }{})}, false},
97 }
98 for _, tt := range tests {
99 t.Run(tt.name, func(t *testing.T) {
100 if got := reflect.IsRegularMemory(tt.args.t); got != tt.want {
101 t.Errorf("isRegularMemory() = %v, want %v", got, tt.want)
102 }
103 })
104 }
105 }
106
107 var sinkType reflect.Type
108
109 func BenchmarkTypeForString(b *testing.B) {
110 for i := 0; i < b.N; i++ {
111 sinkType = reflect.TypeFor[string]()
112 }
113 }
114
115 func BenchmarkTypeForError(b *testing.B) {
116 for i := 0; i < b.N; i++ {
117 sinkType = reflect.TypeFor[error]()
118 }
119 }
120
121 func TestType_CanSeq(t *testing.T) {
122 tests := []struct {
123 name string
124 tr reflect.Type
125 want bool
126 }{
127 {"func(func(int) bool)", reflect.TypeOf(func(func(int) bool) {}), true},
128 {"func(func(int))", reflect.TypeOf(func(func(int)) {}), false},
129 {"int64", reflect.TypeOf(int64(1)), true},
130 {"uint64", reflect.TypeOf(uint64(1)), true},
131 {"*[4]int", reflect.TypeOf(&[4]int{}), true},
132 {"chan int64", reflect.TypeOf(make(chan int64)), true},
133 {"map[int]int", reflect.TypeOf(make(map[int]int)), true},
134 {"string", reflect.TypeOf(""), true},
135 {"[]int", reflect.TypeOf([]int{}), true},
136 }
137 for _, tt := range tests {
138 t.Run(tt.name, func(t *testing.T) {
139 if got := tt.tr.CanSeq(); got != tt.want {
140 t.Errorf("Type.CanSeq() = %v, want %v", got, tt.want)
141 }
142 })
143 }
144 }
145
146 func TestType_CanSeq2(t *testing.T) {
147 tests := []struct {
148 name string
149 tr reflect.Type
150 want bool
151 }{
152 {"func(func(int, int) bool)", reflect.TypeOf(func(func(int, int) bool) {}), true},
153 {"func(func(int, int))", reflect.TypeOf(func(func(int, int)) {}), false},
154 {"int64", reflect.TypeOf(int64(1)), false},
155 {"uint64", reflect.TypeOf(uint64(1)), false},
156 {"*[4]int", reflect.TypeOf(&[4]int{}), true},
157 {"chan int64", reflect.TypeOf(make(chan int64)), false},
158 {"map[int]int", reflect.TypeOf(make(map[int]int)), true},
159 {"string", reflect.TypeOf(""), true},
160 {"[]int", reflect.TypeOf([]int{}), true},
161 }
162 for _, tt := range tests {
163 t.Run(tt.name, func(t *testing.T) {
164 if got := tt.tr.CanSeq2(); got != tt.want {
165 t.Errorf("Type.CanSeq2() = %v, want %v", got, tt.want)
166 }
167 })
168 }
169 }
170
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