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// 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
}
func ExampleJoin() {
err1 := errors.New("err1")
err2 := errors.New("err2")
err := errors.Join(err1, err2)
fmt.Println(err)
if errors.Is(err, err1) {
fmt.Println("err is err1")
}
if errors.Is(err, err2) {
fmt.Println("err is err2")
}
// Output:
// err1
// err2
// err is err1
// err is err2
}
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