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// Copyright 2022 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"
"reflect"
"testing"
)
func TestJoinReturnsNil(t *testing.T) {
if err := errors.Join(); err != nil {
t.Errorf("errors.Join() = %v, want nil", err)
}
if err := errors.Join(nil); err != nil {
t.Errorf("errors.Join(nil) = %v, want nil", err)
}
if err := errors.Join(nil, nil); err != nil {
t.Errorf("errors.Join(nil, nil) = %v, want nil", err)
}
}
func TestJoin(t *testing.T) {
err1 := errors.New("err1")
err2 := errors.New("err2")
for _, test := range []struct {
errs []error
want []error
}{{
errs: []error{err1},
want: []error{err1},
}, {
errs: []error{err1, err2},
want: []error{err1, err2},
}, {
errs: []error{err1, nil, err2},
want: []error{err1, err2},
}} {
got := errors.Join(test.errs...).(interface{ Unwrap() []error }).Unwrap()
if !reflect.DeepEqual(got, test.want) {
t.Errorf("Join(%v) = %v; want %v", test.errs, got, test.want)
}
if len(got) != cap(got) {
t.Errorf("Join(%v) returns errors with len=%v, cap=%v; want len==cap", test.errs, len(got), cap(got))
}
}
}
func TestJoinErrorMethod(t *testing.T) {
err1 := errors.New("err1")
err2 := errors.New("err2")
for _, test := range []struct {
errs []error
want string
}{{
errs: []error{err1},
want: "err1",
}, {
errs: []error{err1, err2},
want: "err1\nerr2",
}, {
errs: []error{err1, nil, err2},
want: "err1\nerr2",
}} {
got := errors.Join(test.errs...).Error()
if got != test.want {
t.Errorf("Join(%v).Error() = %q; want %q", test.errs, got, test.want)
}
}
}
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