implemented event and req

pkg/utils/atomic/unsafe_pointer_test.go

@@ -0,0 +1,83 @@
+// Copyright (c) 2021 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 (
+	"testing"
+	"unsafe"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestUnsafePointer(t *testing.T) {
+	i := int64(42)
+	j := int64(0)
+	k := int64(1)
+
+	tests := []struct {
+		desc      string
+		newAtomic func() *UnsafePointer
+		initial   unsafe.Pointer
+	}{
+		{
+			desc: "non-empty",
+			newAtomic: func() *UnsafePointer {
+				return NewUnsafePointer(unsafe.Pointer(&i))
+			},
+			initial: unsafe.Pointer(&i),
+		},
+		{
+			desc: "nil",
+			newAtomic: func() *UnsafePointer {
+				var p UnsafePointer
+				return &p
+			},
+			initial: unsafe.Pointer(nil),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			t.Run("Load", func(t *testing.T) {
+				atom := tt.newAtomic()
+				require.Equal(t, tt.initial, atom.Load(), "Load should report nil.")
+			})
+
+			t.Run("Swap", func(t *testing.T) {
+				atom := tt.newAtomic()
+				require.Equal(t, tt.initial, atom.Swap(unsafe.Pointer(&k)), "Swap didn't return the old value.")
+				require.Equal(t, unsafe.Pointer(&k), atom.Load(), "Swap didn't set the correct value.")
+			})
+
+			t.Run("CAS", func(t *testing.T) {
+				atom := tt.newAtomic()
+				require.True(t, atom.CAS(tt.initial, unsafe.Pointer(&j)), "CAS didn't report a swap.")
+				require.Equal(t, unsafe.Pointer(&j), atom.Load(), "CAS didn't set the correct value.")
+			})
+
+			t.Run("Store", func(t *testing.T) {
+				atom := tt.newAtomic()
+				atom.Store(unsafe.Pointer(&i))
+				require.Equal(t, unsafe.Pointer(&i), atom.Load(), "Store didn't set the correct value.")
+			})
+		})
+	}
+}