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Source file src/errors/errors_test.go

Documentation: errors

  // 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
  }
  

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