143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package multierr_test
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import (
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"errors"
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"os"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"go.uber.org/multierr"
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)
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type errGreatSadness struct{ id int }
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func (errGreatSadness) Error() string {
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return "great sadness"
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}
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type errUnprecedentedFailure struct{ id int }
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func (errUnprecedentedFailure) Error() string {
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return "unprecedented failure"
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}
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func (e errUnprecedentedFailure) Unwrap() error {
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return errRootCause{e.id}
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}
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type errRootCause struct{ i int }
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func (errRootCause) Error() string {
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return "root cause"
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}
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func TestErrorsWrapping(t *testing.T) {
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err := multierr.Append(
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errGreatSadness{42},
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errUnprecedentedFailure{43},
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)
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t.Run("left", func(t *testing.T) {
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t.Run("As", func(t *testing.T) {
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var got errGreatSadness
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require.True(t, errors.As(err, &got))
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assert.Equal(t, 42, got.id)
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})
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t.Run("Is", func(t *testing.T) {
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assert.False(t, errors.Is(err, errGreatSadness{41}))
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assert.True(t, errors.Is(err, errGreatSadness{42}))
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})
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})
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t.Run("right", func(t *testing.T) {
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t.Run("As", func(t *testing.T) {
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var got errUnprecedentedFailure
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require.True(t, errors.As(err, &got))
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assert.Equal(t, 43, got.id)
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})
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t.Run("Is", func(t *testing.T) {
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assert.False(t, errors.Is(err, errUnprecedentedFailure{42}))
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assert.True(t, errors.Is(err, errUnprecedentedFailure{43}))
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})
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})
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t.Run("top-level", func(t *testing.T) {
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t.Run("As", func(t *testing.T) {
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var got interface{ Errors() []error }
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require.True(t, errors.As(err, &got))
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assert.Len(t, got.Errors(), 2)
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})
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t.Run("Is", func(t *testing.T) {
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assert.True(t, errors.Is(err, err))
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})
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})
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t.Run("root cause", func(t *testing.T) {
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t.Run("As", func(t *testing.T) {
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var got errRootCause
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require.True(t, errors.As(err, &got))
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assert.Equal(t, 43, got.i)
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})
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t.Run("Is", func(t *testing.T) {
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assert.False(t, errors.Is(err, errRootCause{42}))
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assert.True(t, errors.Is(err, errRootCause{43}))
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})
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})
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t.Run("mismatch", func(t *testing.T) {
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t.Run("As", func(t *testing.T) {
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var got *os.PathError
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assert.False(t, errors.As(err, &got))
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})
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t.Run("Is", func(t *testing.T) {
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assert.False(t, errors.Is(err, errors.New("great sadness")))
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})
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})
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}
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func TestErrorsWrappingSameType(t *testing.T) {
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err := multierr.Combine(
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errGreatSadness{1},
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errGreatSadness{2},
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errGreatSadness{3},
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)
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t.Run("As returns first", func(t *testing.T) {
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var got errGreatSadness
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require.True(t, errors.As(err, &got))
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assert.Equal(t, 1, got.id)
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})
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t.Run("Is matches all", func(t *testing.T) {
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assert.True(t, errors.Is(err, errGreatSadness{1}))
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assert.True(t, errors.Is(err, errGreatSadness{2}))
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assert.True(t, errors.Is(err, errGreatSadness{3}))
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})
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}
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