open-consul/internal/testing/golden/golden.go

37 lines
905 B
Go

package golden
import (
"flag"
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
)
// update allows golden files to be updated based on the current output.
var update = flag.Bool("update", false, "update golden files")
// Get reads the expected value from the file at filename and returns the value.
// filename is relative to the ./testdata directory.
//
// If the `-update` flag is used with `go test`, the golden file will be updated
// to the value of actual.
func Get(t *testing.T, actual, filename string) string {
t.Helper()
path := filepath.Join("testdata", filename)
if *update {
if dir := filepath.Dir(path); dir != "." {
require.NoError(t, os.MkdirAll(dir, 0755))
}
err := ioutil.WriteFile(path, []byte(actual), 0644)
require.NoError(t, err)
}
expected, err := ioutil.ReadFile(path)
require.NoError(t, err)
return string(expected)
}