1// Copyright 2011 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package xerrors_test 6 7import ( 8 "fmt" 9 "regexp" 10 "testing" 11 12 "golang.org/x/xerrors" 13) 14 15func TestNewEqual(t *testing.T) { 16 // Different allocations should not be equal. 17 if xerrors.New("abc") == xerrors.New("abc") { 18 t.Errorf(`New("abc") == New("abc")`) 19 } 20 if xerrors.New("abc") == xerrors.New("xyz") { 21 t.Errorf(`New("abc") == New("xyz")`) 22 } 23 24 // Same allocation should be equal to itself (not crash). 25 err := xerrors.New("jkl") 26 if err != err { 27 t.Errorf(`err != err`) 28 } 29} 30 31func TestErrorMethod(t *testing.T) { 32 err := xerrors.New("abc") 33 if err.Error() != "abc" { 34 t.Errorf(`New("abc").Error() = %q, want %q`, err.Error(), "abc") 35 } 36} 37 38func TestNewDetail(t *testing.T) { 39 got := fmt.Sprintf("%+v", xerrors.New("error")) 40 want := `(?s)error:.+errors_test.go:\d+` 41 ok, err := regexp.MatchString(want, got) 42 if err != nil { 43 t.Fatal(err) 44 } 45 if !ok { 46 t.Errorf(`fmt.Sprintf("%%+v", New("error")) = %q, want %q"`, got, want) 47 } 48} 49 50func ExampleNew() { 51 err := xerrors.New("emit macho dwarf: elf header corrupted") 52 if err != nil { 53 fmt.Print(err) 54 } 55 // Output: emit macho dwarf: elf header corrupted 56} 57 58// The fmt package's Errorf function lets us use the package's formatting 59// features to create descriptive error messages. 60func ExampleNew_errorf() { 61 const name, id = "bimmler", 17 62 err := fmt.Errorf("user %q (id %d) not found", name, id) 63 if err != nil { 64 fmt.Print(err) 65 } 66 // Output: user "bimmler" (id 17) not found 67} 68