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opt
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golang
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1.17.2
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src
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errors
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View File Name :
errors_test.go
// 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 errors_test import ( "errors" "fmt" "testing" ) func TestNewEqual(t *testing.T) { // Different allocations should not be equal. if errors.New("abc") == errors.New("abc") { t.Errorf(`New("abc") == New("abc")`) } if errors.New("abc") == errors.New("xyz") { t.Errorf(`New("abc") == New("xyz")`) } // Same allocation should be equal to itself (not crash). err := errors.New("jkl") if err != err { t.Errorf(`err != err`) } } func TestErrorMethod(t *testing.T) { err := errors.New("abc") if err.Error() != "abc" { t.Errorf(`New("abc").Error() = %q, want %q`, err.Error(), "abc") } } func ExampleNew() { err := errors.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 }