| // Copyright (c) 2016 Uber Technologies, Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| package atomic |
| |
| import ( |
| "errors" |
| "testing" |
| |
| "github.com/stretchr/testify/assert" |
| "github.com/stretchr/testify/require" |
| ) |
| |
| func TestErrorByValue(t *testing.T) { |
| err := &Error{} |
| require.Nil(t, err.Load(), "Initial value shall be nil") |
| } |
| |
| func TestNewErrorWithNilArgument(t *testing.T) { |
| err := NewError(nil) |
| require.Nil(t, err.Load(), "Initial value shall be nil") |
| } |
| |
| func TestErrorCanStoreNil(t *testing.T) { |
| err := NewError(errors.New("hello")) |
| err.Store(nil) |
| require.Nil(t, err.Load(), "Stored value shall be nil") |
| } |
| |
| func TestNewErrorWithError(t *testing.T) { |
| err1 := errors.New("hello1") |
| err2 := errors.New("hello2") |
| |
| atom := NewError(err1) |
| require.Equal(t, err1, atom.Load(), "Expected Load to return initialized value") |
| |
| atom.Store(err2) |
| require.Equal(t, err2, atom.Load(), "Expected Load to return overridden value") |
| } |
| |
| func TestErrorSwap(t *testing.T) { |
| err1 := errors.New("hello1") |
| err2 := errors.New("hello2") |
| |
| atom := NewError(err1) |
| require.Equal(t, err1, atom.Load(), "Expected Load to return initialized value") |
| |
| old := atom.Swap(err2) |
| require.Equal(t, err2, atom.Load(), "Expected Load to return overridden value") |
| require.Equal(t, err1, old, "Expected old to be initial value") |
| } |
| |
| func TestErrorCompareAndSwap(t *testing.T) { |
| err1 := errors.New("hello1") |
| err2 := errors.New("hello2") |
| |
| atom := NewError(err1) |
| require.Equal(t, err1, atom.Load(), "Expected Load to return initialized value") |
| |
| swapped := atom.CompareAndSwap(err2, err2) |
| require.False(t, swapped, "Expected swapped to be false") |
| require.Equal(t, err1, atom.Load(), "Expected Load to return initial value") |
| |
| swapped = atom.CompareAndSwap(err1, err2) |
| require.True(t, swapped, "Expected swapped to be true") |
| require.Equal(t, err2, atom.Load(), "Expected Load to return overridden value") |
| } |
| |
| func TestError_InitializeDefaults(t *testing.T) { |
| tests := []struct { |
| msg string |
| newError func() *Error |
| }{ |
| { |
| msg: "Uninitialized", |
| newError: func() *Error { |
| var e Error |
| return &e |
| }, |
| }, |
| { |
| msg: "NewError with default", |
| newError: func() *Error { |
| return NewError(nil) |
| }, |
| }, |
| { |
| msg: "Error swapped with default", |
| newError: func() *Error { |
| e := NewError(assert.AnError) |
| e.Swap(nil) |
| return e |
| }, |
| }, |
| { |
| msg: "Error CAS'd with default", |
| newError: func() *Error { |
| e := NewError(assert.AnError) |
| e.CompareAndSwap(assert.AnError, nil) |
| return e |
| }, |
| }, |
| } |
| |
| for _, tt := range tests { |
| t.Run(tt.msg, func(t *testing.T) { |
| t.Run("CompareAndSwap", func(t *testing.T) { |
| e := tt.newError() |
| require.True(t, e.CompareAndSwap(nil, assert.AnError)) |
| assert.Equal(t, assert.AnError, e.Load()) |
| }) |
| |
| t.Run("Swap", func(t *testing.T) { |
| e := tt.newError() |
| assert.Equal(t, nil, e.Swap(assert.AnError)) |
| }) |
| }) |
| } |
| } |