1 files changed, 174 insertions, 0 deletions
diff --git a/internal/cmd/edit_test.go b/internal/cmd/edit_test.go
new file mode 100644
index 0000000..df18c45
--- /dev/null
+++ b/internal/cmd/edit_test.go
@@ -0,0 +1,174 @@
+// 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 cmd
+
+import (
+	"bytes"
+	"io"
+	"net/http/httptest"
+	"net/url"
+	"path"
+	"strings"
+	"testing"
+
+	"github.com/google/go-containerregistry/pkg/crane"
+	"github.com/google/go-containerregistry/pkg/registry"
+	"github.com/google/go-containerregistry/pkg/v1/random"
+)
+
+func mustRegistry(t *testing.T) (*httptest.Server, string) {
+	t.Helper()
+	s := httptest.NewServer(registry.New())
+	u, err := url.Parse(s.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return s, u.Host
+}
+
+func TestEditConfig(t *testing.T) {
+	reg, host := mustRegistry(t)
+	defer reg.Close()
+	src := path.Join(host, "crane/edit/config")
+
+	img, err := random.Image(1024, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := crane.Push(img, src); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := NewCmdEditConfig(&[]crane.Option{})
+	cmd.SetArgs([]string{src})
+	cmd.SetIn(strings.NewReader("{}"))
+
+	if err := cmd.Execute(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEditManifest(t *testing.T) {
+	reg, host := mustRegistry(t)
+	defer reg.Close()
+	src := path.Join(host, "crane/edit/manifest")
+
+	img, err := random.Image(1024, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := crane.Push(img, src); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := NewCmdEditManifest(&[]crane.Option{})
+	cmd.SetArgs([]string{src})
+	cmd.SetIn(strings.NewReader("{}"))
+	if err := cmd.Execute(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEditFilesystem(t *testing.T) {
+	reg, host := mustRegistry(t)
+	defer reg.Close()
+	src := path.Join(host, "crane/edit/fs")
+
+	img, err := random.Image(1024, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := crane.Push(img, src); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := NewCmdEditFs(&[]crane.Option{})
+	cmd.SetArgs([]string{src})
+	cmd.Flags().Set("filename", "/foo/bar")
+	cmd.SetIn(strings.NewReader("baz"))
+	if err := cmd.Execute(); err != nil {
+		t.Fatal(err)
+	}
+
+	img, err = crane.Pull(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r, _, err := findFile(img, "/foo/bar")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := io.ReadAll(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(got, []byte("baz")) {
+		t.Fatalf("got: %s, want %s", got, "baz")
+	}
+
+	// Edit the same file to make sure we can edit existing files.
+	cmd = NewCmdEditFs(&[]crane.Option{})
+	cmd.SetArgs([]string{src})
+	cmd.Flags().Set("filename", "/foo/bar")
+	cmd.SetIn(strings.NewReader("quux"))
+	if err := cmd.Execute(); err != nil {
+		t.Fatal(err)
+	}
+
+	img, err = crane.Pull(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r, _, err = findFile(img, "/foo/bar")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	got, err = io.ReadAll(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(got, []byte("quux")) {
+		t.Fatalf("got: %s, want %s", got, "quux")
+	}
+}
+
+func TestFindFile(t *testing.T) {
+	img, err := random.Image(1024, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	r, h, err := findFile(img, "/does-not-exist")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b, err := io.ReadAll(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(b) != 0 {
+		t.Errorf("expected empty reader, got: %s", string(b))
+	}
+
+	if h.Name != "/does-not-exist" {
+		t.Errorf("tar.Header has wrong name: %v", h)
+	}
+}