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// Copyright 2011 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 xerrors_test
import (
"fmt"
"regexp"
"testing"
"golang.org/x/xerrors"
)
func TestNewEqual(t *testing.T) {
// Different allocations should not be equal.
if xerrors.New("abc") == xerrors.New("abc") {
t.Errorf(`New("abc") == New("abc")`)
}
if xerrors.New("abc") == xerrors.New("xyz") {
t.Errorf(`New("abc") == New("xyz")`)
}
// Same allocation should be equal to itself (not crash).
err := xerrors.New("jkl")
if err != err {
t.Errorf(`err != err`)
}
}
func TestErrorMethod(t *testing.T) {
err := xerrors.New("abc")
if err.Error() != "abc" {
t.Errorf(`New("abc").Error() = %q, want %q`, err.Error(), "abc")
}
}
func TestNewDetail(t *testing.T) {
got := fmt.Sprintf("%+v", xerrors.New("error"))
want := `(?s)error:.+errors_test.go:\d+`
ok, err := regexp.MatchString(want, got)
if err != nil {
t.Fatal(err)
}
if !ok {
t.Errorf(`fmt.Sprintf("%%+v", New("error")) = %q, want %q"`, got, want)
}
}
func ExampleNew() {
err := xerrors.New("emit macho dwarf: elf header corrupted")
if err != nil {
fmt.Print(err)
}
// Output: emit macho dwarf: elf header corrupted
}
// The fmt package's Errorf function lets us use the package's formatting
// features to create descriptive error messages.
func ExampleNew_errorf() {
const name, id = "bimmler", 17
err := fmt.Errorf("user %q (id %d) not found", name, id)
if err != nil {
fmt.Print(err)
}
// Output: user "bimmler" (id 17) not found
}
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