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// Copyright 2018 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 errors
import (
"errors"
"strings"
"testing"
)
func TestErrors(t *testing.T) {
var sentinel = New("sentinel")
var foreign = errors.New("foreign")
for _, test := range []struct {
what string
err error
wantText string
is []error
isNot []error
}{{
what: `New("abc")`,
err: New("abc"),
wantText: "abc",
}, {
what: `New("%v", sentinel)`,
err: New("%v", sentinel),
wantText: "sentinel",
isNot: []error{sentinel},
}, {
what: `Wrap(sentinel, "%v", "text")`,
err: Wrap(sentinel, "%v", "text"),
wantText: "text: sentinel",
is: []error{sentinel},
}, {
what: `New("%v", foreign)`,
err: New("%v", foreign),
wantText: "foreign",
isNot: []error{foreign},
}, {
what: `Wrap(foreign, "%v", "text")`,
err: Wrap(foreign, "%v", "text"),
wantText: "text: foreign",
is: []error{foreign},
}} {
if got, want := test.err.Error(), prefix; !strings.HasPrefix(got, want) {
t.Errorf("%v.Error() = %q, want prefix %q", test.what, got, want)
}
if got, want := test.err.Error(), prefix+test.wantText; got != want {
t.Errorf("%v.Error() = %q, want %q", test.what, got, want)
}
if got, want := Is(test.err, Error), true; got != want {
t.Errorf("errors.Is(%v, errors.Error) = %v, want %v", test.what, got, want)
}
for _, err := range test.is {
if got, want := Is(test.err, err), true; got != want {
t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
}
}
for _, err := range test.isNot {
if got, want := Is(test.err, err), false; got != want {
t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
}
}
}
}
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