1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
package testutils
import (
"bytes"
"fmt"
"reflect"
"github.com/go-quicktest/qt"
)
// Contains checks if interface value I is of type T. Use with qt.Satisfies:
//
// qt.Assert(t, qt.Satisfies(p, testutils.Contains[*ebpf.Program]))
func Contains[T, I any](i I) bool {
_, ok := any(i).(T)
return ok
}
// IsDeepCopy checks that got is a deep copy of want.
//
// All primitive values must be equal, but pointers must be distinct.
// This is different from [reflect.DeepEqual] which will accept equal pointer values.
// That is, reflect.DeepEqual(a, a) is true, while IsDeepCopy(a, a) is false.
func IsDeepCopy[T any](got, want T) qt.Checker {
return &deepCopyChecker[T]{got, want, make(map[pair]struct{})}
}
type pair struct {
got, want reflect.Value
}
type deepCopyChecker[T any] struct {
got, want T
visited map[pair]struct{}
}
func (dcc *deepCopyChecker[T]) Check(_ func(key string, value any)) error {
return dcc.check(reflect.ValueOf(dcc.got), reflect.ValueOf(dcc.want))
}
func (dcc *deepCopyChecker[T]) check(got, want reflect.Value) error {
switch want.Kind() {
case reflect.Interface:
return dcc.check(got.Elem(), want.Elem())
case reflect.Pointer:
if got.IsNil() && want.IsNil() {
return nil
}
if got.IsNil() {
return fmt.Errorf("expected non-nil pointer")
}
if want.IsNil() {
return fmt.Errorf("expected nil pointer")
}
if got.UnsafePointer() == want.UnsafePointer() {
return fmt.Errorf("equal pointer values")
}
switch want.Type() {
case reflect.TypeOf((*bytes.Reader)(nil)):
// bytes.Reader doesn't allow modifying it's contents, so we
// allow a shallow copy.
return nil
}
if _, ok := dcc.visited[pair{got, want}]; ok {
// Deal with recursive types.
return nil
}
dcc.visited[pair{got, want}] = struct{}{}
return dcc.check(got.Elem(), want.Elem())
case reflect.Slice:
if got.IsNil() && want.IsNil() {
return nil
}
if got.IsNil() {
return fmt.Errorf("expected non-nil slice")
}
if want.IsNil() {
return fmt.Errorf("expected nil slice")
}
if got.Len() != want.Len() {
return fmt.Errorf("expected %d elements, got %d", want.Len(), got.Len())
}
if want.Len() == 0 {
return nil
}
if got.UnsafePointer() == want.UnsafePointer() {
return fmt.Errorf("equal backing memory")
}
fallthrough
case reflect.Array:
for i := 0; i < want.Len(); i++ {
if err := dcc.check(got.Index(i), want.Index(i)); err != nil {
return fmt.Errorf("index %d: %w", i, err)
}
}
return nil
case reflect.Struct:
for i := 0; i < want.NumField(); i++ {
if err := dcc.check(got.Field(i), want.Field(i)); err != nil {
return fmt.Errorf("%q: %w", want.Type().Field(i).Name, err)
}
}
return nil
case reflect.Map:
if got.Len() != want.Len() {
return fmt.Errorf("expected %d items, got %d", want.Len(), got.Len())
}
if got.UnsafePointer() == want.UnsafePointer() {
return fmt.Errorf("maps are equal")
}
iter := want.MapRange()
for iter.Next() {
key := iter.Key()
got := got.MapIndex(iter.Key())
if !got.IsValid() {
return fmt.Errorf("key %v is missing", key)
}
want := iter.Value()
if err := dcc.check(got, want); err != nil {
return fmt.Errorf("key %v: %w", key, err)
}
}
return nil
case reflect.Chan, reflect.UnsafePointer:
return fmt.Errorf("%s is not supported", want.Type())
default:
// Compare by value as usual.
if !got.Equal(want) {
return fmt.Errorf("%#v is not equal to %#v", got, want)
}
return nil
}
}
func (dcc *deepCopyChecker[T]) Args() []qt.Arg {
return []qt.Arg{
{Name: "got", Value: dcc.got},
{Name: "want", Value: dcc.want},
}
}
|
