1 files changed, 73 insertions, 0 deletions
diff --git a/pkg/crane/append_test.go b/pkg/crane/append_test.go
new file mode 100644
index 0000000..d894a9d
--- /dev/null
+++ b/pkg/crane/append_test.go
@@ -0,0 +1,73 @@
+// Copyright 2022 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 crane_test
+
+import (
+	"testing"
+
+	"github.com/google/go-containerregistry/pkg/crane"
+	"github.com/google/go-containerregistry/pkg/v1/empty"
+	"github.com/google/go-containerregistry/pkg/v1/mutate"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+func TestAppendWithOCIBaseImage(t *testing.T) {
+	base := mutate.MediaType(empty.Image, types.OCIManifestSchema1)
+	img, err := crane.Append(base, "testdata/content.tar")
+
+	if err != nil {
+		t.Fatalf("crane.Append(): %v", err)
+	}
+
+	layers, err := img.Layers()
+
+	if err != nil {
+		t.Fatalf("img.Layers(): %v", err)
+	}
+
+	mediaType, err := layers[0].MediaType()
+
+	if err != nil {
+		t.Fatalf("layers[0].MediaType(): %v", err)
+	}
+
+	if got, want := mediaType, types.OCILayer; got != want {
+		t.Errorf("MediaType(): want %q, got %q", want, got)
+	}
+}
+
+func TestAppendWithDockerBaseImage(t *testing.T) {
+	img, err := crane.Append(empty.Image, "testdata/content.tar")
+
+	if err != nil {
+		t.Fatalf("crane.Append(): %v", err)
+	}
+
+	layers, err := img.Layers()
+
+	if err != nil {
+		t.Fatalf("img.Layers(): %v", err)
+	}
+
+	mediaType, err := layers[0].MediaType()
+
+	if err != nil {
+		t.Fatalf("layers[0].MediaType(): %v", err)
+	}
+
+	if got, want := mediaType, types.DockerLayer; got != want {
+		t.Errorf("MediaType(): want %q, got %q", want, got)
+	}
+}