DockerCLI/cli/command/image/save_test.go

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package image
import (
"io"
"io/ioutil"
"os"
"strings"
"testing"
"github.com/docker/cli/internal/test"
"github.com/pkg/errors"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func TestNewSaveCommandErrors(t *testing.T) {
testCases := []struct {
name string
args []string
isTerminal bool
expectedError string
imageSaveFunc func(images []string) (io.ReadCloser, error)
}{
{
name: "wrong args",
args: []string{},
expectedError: "requires at least 1 argument.",
},
{
name: "output to terminal",
args: []string{"output", "file", "arg1"},
isTerminal: true,
expectedError: "cowardly refusing to save to a terminal. Use the -o flag or redirect",
},
{
name: "ImageSave fail",
args: []string{"arg1"},
isTerminal: false,
expectedError: "error saving image",
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
return ioutil.NopCloser(strings.NewReader("")), errors.Errorf("error saving image")
},
},
{
name: "output directory does not exist",
args: []string{"-o", "fakedir/out.tar", "arg1"},
expectedError: "failed to save image: invalid output path: directory \"fakedir\" does not exist",
},
{
name: "output file is irregular",
args: []string{"-o", "/dev/null", "arg1"},
expectedError: "failed to save image: invalid output path: \"/dev/null\" must be a directory or a regular file",
},
}
for _, tc := range testCases {
cli := test.NewFakeCli(&fakeClient{imageSaveFunc: tc.imageSaveFunc})
cli.Out().SetIsTerminal(tc.isTerminal)
cmd := NewSaveCommand(cli)
cmd.SetOutput(ioutil.Discard)
cmd.SetArgs(tc.args)
assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
}
}
func TestNewSaveCommandSuccess(t *testing.T) {
testCases := []struct {
args []string
isTerminal bool
imageSaveFunc func(images []string) (io.ReadCloser, error)
deferredFunc func()
}{
{
args: []string{"-o", "save_tmp_file", "arg1"},
isTerminal: true,
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
assert.Assert(t, is.Len(images, 1))
assert.Check(t, is.Equal("arg1", images[0]))
return ioutil.NopCloser(strings.NewReader("")), nil
},
deferredFunc: func() {
os.Remove("save_tmp_file")
},
},
{
args: []string{"arg1", "arg2"},
isTerminal: false,
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
assert.Assert(t, is.Len(images, 2))
assert.Check(t, is.Equal("arg1", images[0]))
assert.Check(t, is.Equal("arg2", images[1]))
return ioutil.NopCloser(strings.NewReader("")), nil
},
},
}
for _, tc := range testCases {
cmd := NewSaveCommand(test.NewFakeCli(&fakeClient{
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
return ioutil.NopCloser(strings.NewReader("")), nil
},
}))
cmd.SetOutput(ioutil.Discard)
cmd.SetArgs(tc.args)
assert.NilError(t, cmd.Execute())
if tc.deferredFunc != nil {
tc.deferredFunc()
}
}
}