Add DeepCopy! Also-- optimize conversion for []byte

pkg/conversion/deep_copy_test.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package conversion
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/google/gofuzz"
+)
+
+func TestDeepCopy(t *testing.T) {
+	semantic := EqualitiesOrDie()
+	f := fuzz.New().NilChance(.5).NumElements(0, 100)
+	table := []interface{}{
+		map[string]string{},
+		int(5),
+		"hello world",
+		struct {
+			A, B, C struct {
+				D map[string]int
+			}
+			X []int
+			Y []byte
+		}{},
+	}
+	for _, obj := range table {
+		obj2, err := DeepCopy(obj)
+		if err != nil {
+			t.Errorf("Error: couldn't copy %#v", obj)
+			continue
+		}
+		if e, a := obj, obj2; !semantic.DeepEqual(e, a) {
+			t.Errorf("expected %#v\ngot %#v", e, a)
+		}
+
+		obj3 := reflect.New(reflect.TypeOf(obj)).Interface()
+		f.Fuzz(obj3)
+		obj4, err := DeepCopy(obj3)
+		if err != nil {
+			t.Errorf("Error: couldn't copy %#v", obj)
+			continue
+		}
+		if e, a := obj3, obj4; !semantic.DeepEqual(e, a) {
+			t.Errorf("expected %#v\ngot %#v", e, a)
+		}
+		f.Fuzz(obj3)
+	}
+}
+
+func copyOrDie(t *testing.T, in interface{}) interface{} {
+	out, err := DeepCopy(in)
+	if err != nil {
+		t.Fatalf("DeepCopy failed: %#q: %v", in, err)
+	}
+	return out
+}
+
+func TestDeepCopySliceSeparate(t *testing.T) {
+	x := []int{5}
+	y := copyOrDie(t, x).([]int)
+	x[0] = 3
+	if y[0] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyArraySeparate(t *testing.T) {
+	x := [1]int{5}
+	y := copyOrDie(t, x).([1]int)
+	x[0] = 3
+	if y[0] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyMapSeparate(t *testing.T) {
+	x := map[string]int{"foo": 5}
+	y := copyOrDie(t, x).(map[string]int)
+	x["foo"] = 3
+	if y["foo"] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyPointerSeparate(t *testing.T) {
+	z := 5
+	x := &z
+	y := copyOrDie(t, x).(*int)
+	*x = 3
+	if *y == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}