1
2
3 package errors
4
5 import (
6 "io"
7 "testing"
8 )
9
10
11 func TestIs113(t *testing.T) {
12 custErr := errorWithCustomIs{
13 Key: "TestForFun",
14 Err: io.EOF,
15 }
16
17 shouldMatch := errorWithCustomIs{
18 Key: "TestForFun",
19 }
20
21 shouldNotMatch := errorWithCustomIs{Key: "notOk"}
22
23 if !Is(custErr, shouldMatch) {
24 t.Errorf("custErr is not a TestForFun customError")
25 }
26
27 if Is(custErr, shouldNotMatch) {
28 t.Errorf("custErr is a notOk customError")
29 }
30
31 if !Is(custErr, New(shouldMatch)) {
32 t.Errorf("custErr is not a New(TestForFun customError)")
33 }
34
35 if Is(custErr, New(shouldNotMatch)) {
36 t.Errorf("custErr is a New(notOk customError)")
37 }
38
39 if !Is(New(custErr), shouldMatch) {
40 t.Errorf("New(custErr) is not a TestForFun customError")
41 }
42
43 if Is(New(custErr), shouldNotMatch) {
44 t.Errorf("New(custErr) is a notOk customError")
45 }
46
47 if !Is(New(custErr), New(shouldMatch)) {
48 t.Errorf("New(custErr) is not a New(TestForFun customError)")
49 }
50
51 if Is(New(custErr), New(shouldNotMatch)) {
52 t.Errorf("New(custErr) is a New(notOk customError)")
53 }
54 }
55
56 type errorWithCustomIs struct {
57 Key string
58 Err error
59 }
60
61 func (ewci errorWithCustomIs) Error() string {
62 return "[" + ewci.Key + "]: " + ewci.Err.Error()
63 }
64
65 func (ewci errorWithCustomIs) Is(target error) bool {
66 matched, ok := target.(errorWithCustomIs)
67 return ok && matched.Key == ewci.Key
68 }
69
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