open-consul/agent/xds/golden_test.go

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package xds
import (
"flag"
"fmt"
"io/ioutil"
"path/filepath"
"testing"
envoy "github.com/envoyproxy/go-control-plane/envoy/api/v2"
"github.com/golang/protobuf/jsonpb"
"github.com/hashicorp/go-version"
"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")
// goldenEnvoy is a special variant of golden() that silos each named test by
// each supported envoy version
func goldenEnvoy(t *testing.T, name, envoyVersion, got string) string {
require.NotEmpty(t, envoyVersion)
// We do version sniffing on the complete version, but only generate
// golden files ignoring the patch portion
version := version.Must(version.NewVersion(envoyVersion))
segments := version.Segments()
require.Len(t, segments, 3)
subname := fmt.Sprintf("envoy-%d-%d-x", segments[0], segments[1])
return golden(t, name, subname, got)
}
// golden reads and optionally writes the expected data to the golden file,
// returning the contents as a string.
func golden(t *testing.T, name, subname, got string) string {
t.Helper()
suffix := ".golden"
if subname != "" {
suffix = fmt.Sprintf(".%s.golden", subname)
}
golden := filepath.Join("testdata", name+suffix)
if *update && got != "" {
err := ioutil.WriteFile(golden, []byte(got), 0644)
require.NoError(t, err)
}
expected, err := ioutil.ReadFile(golden)
require.NoError(t, err)
return string(expected)
}
func responseToJSON(t *testing.T, r *envoy.DiscoveryResponse) string {
t.Helper()
m := jsonpb.Marshaler{
Indent: " ",
}
gotJSON, err := m.MarshalToString(r)
require.NoError(t, err)
return gotJSON
}