1 files changed, 48 insertions, 0 deletions
diff --git a/internal/compare/layer_test.go b/internal/compare/layer_test.go
new file mode 100644
index 0000000..6db9751
--- /dev/null
+++ b/internal/compare/layer_test.go
@@ -0,0 +1,48 @@
+// Copyright 2019 Google LLC 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 compare
+
+import (
+	"testing"
+
+	"github.com/google/go-containerregistry/pkg/v1/random"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+func TestDifferentLayers(t *testing.T) {
+	a, err := random.Layer(100, types.DockerLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := random.Layer(100, types.OCILayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := Layers(a, b); err == nil {
+		t.Errorf("got nil err, should have something")
+	}
+}
+
+func TestEqualLayers(t *testing.T) {
+	a, err := random.Layer(100, types.DockerLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := Layers(a, a); err != nil {
+		t.Errorf("got err: %v", err)
+	}
+}