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// +build go1.13
package errors
import (
"io"
"testing"
)
// This test should work only for go 1.13 and latter
func TestIs113(t *testing.T) {
custErr := errorWithCustomIs{
Key: "TestForFun",
Err: io.EOF,
}
shouldMatch := errorWithCustomIs{
Key: "TestForFun",
}
shouldNotMatch := errorWithCustomIs{Key: "notOk"}
if !Is(custErr, shouldMatch) {
t.Errorf("custErr is not a TestForFun customError")
}
if Is(custErr, shouldNotMatch) {
t.Errorf("custErr is a notOk customError")
}
if !Is(custErr, New(shouldMatch)) {
t.Errorf("custErr is not a New(TestForFun customError)")
}
if Is(custErr, New(shouldNotMatch)) {
t.Errorf("custErr is a New(notOk customError)")
}
if !Is(New(custErr), shouldMatch) {
t.Errorf("New(custErr) is not a TestForFun customError")
}
if Is(New(custErr), shouldNotMatch) {
t.Errorf("New(custErr) is a notOk customError")
}
if !Is(New(custErr), New(shouldMatch)) {
t.Errorf("New(custErr) is not a New(TestForFun customError)")
}
if Is(New(custErr), New(shouldNotMatch)) {
t.Errorf("New(custErr) is a New(notOk customError)")
}
}
type errorWithCustomIs struct {
Key string
Err error
}
func (ewci errorWithCustomIs) Error() string {
return "[" + ewci.Key + "]: " + ewci.Err.Error()
}
func (ewci errorWithCustomIs) Is(target error) bool {
matched, ok := target.(errorWithCustomIs)
return ok && matched.Key == ewci.Key
}
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