libgo/go/errors/errors_test.go

   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 }