1 // Copyright 2022 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.
13 func TestJoinReturnsNil(t *testing.T) {
14 if err := errors.Join(); err != nil {
15 t.Errorf("errors.Join() = %v, want nil", err)
17 if err := errors.Join(nil); err != nil {
18 t.Errorf("errors.Join(nil) = %v, want nil", err)
20 if err := errors.Join(nil, nil); err != nil {
21 t.Errorf("errors.Join(nil, nil) = %v, want nil", err)
25 func TestJoin(t *testing.T) {
26 err1 := errors.New("err1")
27 err2 := errors.New("err2")
28 for _, test := range []struct {
35 errs: []error{err1, err2},
36 want: []error{err1, err2},
38 errs: []error{err1, nil, err2},
39 want: []error{err1, err2},
41 got := errors.Join(test.errs...).(interface{ Unwrap() []error }).Unwrap()
42 if !reflect.DeepEqual(got, test.want) {
43 t.Errorf("Join(%v) = %v; want %v", test.errs, got, test.want)
45 if len(got) != cap(got) {
46 t.Errorf("Join(%v) returns errors with len=%v, cap=%v; want len==cap", test.errs, len(got), cap(got))
51 func TestJoinErrorMethod(t *testing.T) {
52 err1 := errors.New("err1")
53 err2 := errors.New("err2")
54 for _, test := range []struct {
61 errs: []error{err1, err2},
64 errs: []error{err1, nil, err2},
67 got := errors.Join(test.errs...).Error()
69 t.Errorf("Join(%v).Error() = %q; want %q", test.errs, got, test.want)