initial commit

Signed-off-by: Derek McQuay <derekmcquay@gmail.com>

vendor/cloud.google.com/go/internal/testutil/cmp.go

@@ -0,0 +1,53 @@
+// Copyright 2017 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 testutil
+
+import (
+	"math"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/google/go-cmp/cmp"
+)
+
+var (
+	alwaysEqual = cmp.Comparer(func(_, _ interface{}) bool { return true })
+
+	defaultCmpOptions = []cmp.Option{
+		// Use proto.Equal for protobufs
+		cmp.Comparer(proto.Equal),
+		// NaNs compare equal
+		cmp.FilterValues(func(x, y float64) bool {
+			return math.IsNaN(x) && math.IsNaN(y)
+		}, alwaysEqual),
+		cmp.FilterValues(func(x, y float32) bool {
+			return math.IsNaN(float64(x)) && math.IsNaN(float64(y))
+		}, alwaysEqual),
+	}
+)
+
+// Equal tests two values for equality.
+func Equal(x, y interface{}, opts ...cmp.Option) bool {
+	// Put default options at the end. Order doesn't matter.
+	opts = append(opts[:len(opts):len(opts)], defaultCmpOptions...)
+	return cmp.Equal(x, y, opts...)
+}
+
+// Diff reports the differences between two values.
+// Diff(x, y) == "" iff Equal(x, y).
+func Diff(x, y interface{}, opts ...cmp.Option) string {
+	// Put default options at the end. Order doesn't matter.
+	opts = append(opts[:len(opts):len(opts)], defaultCmpOptions...)
+	return cmp.Diff(x, y, opts...)
+}