implemented event and req

pkg/utils/atomic/error_test.go

@@ -0,0 +1,136 @@
+// 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))
+			})
+		})
+	}
+}