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 5 package errors_test 6 7 import ( 8 "errors" 9 "fmt" 10 "testing" 11 ) 12 13 func TestNewEqual(t *testing.T) { 14 // Different allocations should not be equal. 15 if errors.New("abc") == errors.New("abc") { 16 t.Errorf(`New("abc") == New("abc")`) 17 } 18 if errors.New("abc") == errors.New("xyz") { 19 t.Errorf(`New("abc") == New("xyz")`) 20 } 21 22 // Same allocation should be equal to itself (not crash). 23 err := errors.New("jkl") 24 if err != err { 25 t.Errorf(`err != err`) 26 } 27 } 28 29 func TestErrorMethod(t *testing.T) { 30 err := errors.New("abc") 31 if err.Error() != "abc" { 32 t.Errorf(`New("abc").Error() = %q, want %q`, err.Error(), "abc") 33 } 34 } 35 36 func ExampleNew() { 37 err := errors.New("emit macho dwarf: elf header corrupted") 38 if err != nil { 39 fmt.Print(err) 40 } 41 // Output: emit macho dwarf: elf header corrupted 42 } 43 44 // The fmt package's Errorf function lets us use the package's formatting 45 // features to create descriptive error messages. 46 func ExampleNew_errorf() { 47 const name, id = "bimmler", 17 48 err := fmt.Errorf("user %q (id %d) not found", name, id) 49 if err != nil { 50 fmt.Print(err) 51 } 52 // Output: user "bimmler" (id 17) not found 53 } 54
