undocker/internal/cmdrootfs/cmdrootfs_test.go

96 lines
2.3 KiB
Go

package cmdrootfs
import (
"bytes"
"io"
"io/ioutil"
"path/filepath"
"testing"
goflags "github.com/jessevdk/go-flags"
"github.com/motiejus/code/undocker/internal/cmd"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestExecute(t *testing.T) {
var _foo = []byte("foo foo")
tests := []struct {
name string
fixture func(*testing.T, string)
infile string
outfile string
wantErr string
}{
{
name: "ok passthrough via stdout",
infile: "t10-in.txt",
fixture: func(t *testing.T, dir string) {
fname := filepath.Join(dir, "t10-in.txt")
require.NoError(t, ioutil.WriteFile(fname, _foo, 0644))
},
outfile: "-",
},
{
name: "ok passthrough via file",
infile: "t20-in.txt",
fixture: func(t *testing.T, dir string) {
fname := filepath.Join(dir, "t20-in.txt")
require.NoError(t, ioutil.WriteFile(fname, _foo, 0644))
},
outfile: "t20-out.txt",
},
{
name: "infile does not exist",
infile: "t3-does-not-exist.txt",
wantErr: "^open .*t3-does-not-exist.txt: no such file or directory$",
},
{
name: "outpath dir not writable",
outfile: filepath.Join("t4", "does", "not", "exist"),
wantErr: "^create: open .*/t4/does/not/exist: no such file or directory",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
dir := t.TempDir()
var stdout bytes.Buffer
c := &Command{BaseCommand: cmd.BaseCommand{Stdout: &stdout}}
if tt.fixture != nil {
tt.fixture(t, dir)
}
if tt.outfile != "-" {
tt.outfile = filepath.Join(dir, tt.outfile)
}
inf := filepath.Join(dir, tt.infile)
c.PositionalArgs.Infile = goflags.Filename(inf)
c.PositionalArgs.Outfile = tt.outfile
c.rootfsNew = func(r io.ReadSeeker) io.WriterTo {
return &passthrough{r}
}
err := c.Execute(nil)
if tt.wantErr != "" {
require.Error(t, err)
assert.Regexp(t, tt.wantErr, err.Error())
return
}
var out []byte
require.NoError(t, err)
if tt.outfile == "-" {
out = stdout.Bytes()
} else {
out, err = ioutil.ReadFile(tt.outfile)
require.NoError(t, err)
}
assert.Equal(t, []byte("foo foo"), out)
})
}
}
type passthrough struct{ r io.Reader }
func (p *passthrough) WriteTo(w io.Writer) (int64, error) { return io.Copy(w, p.r) }