// Copyright 2021 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

import (
	"bytes"
	"testing"

	"github.com/google/go-containerregistry/pkg/v1/empty"
	"github.com/google/go-containerregistry/pkg/v1/mutate"
	"github.com/google/go-containerregistry/pkg/v1/static"
	"github.com/google/go-containerregistry/pkg/v1/types"
)

func TestExport(t *testing.T) {
	want := []byte(`{"foo":"bar"}`)
	layer := static.NewLayer(want, types.MediaType("application/json"))
	img, err := mutate.AppendLayers(empty.Image, layer)
	if err != nil {
		t.Fatal(err)
	}
	var buf bytes.Buffer
	if err := Export(img, &buf); err != nil {
		t.Fatal(err)
	}
	if got := buf.Bytes(); !bytes.Equal(got, want) {
		t.Errorf("got: %s\nwant: %s", got, want)
	}
}