Function TestSetFlagsFromEnv

pkg/flags/flag_test.go:27–57

(t *testing.T)

)

func TestSetFlagsFromEnv(t *testing.T) {
	fs := flag.NewFlagSet("testing", flag.ExitOnError)
	fs.String("a", "", "")
	fs.String("b", "", "")
	fs.String("c", "", "")
	fs.Parse([]string{})

	// flags should be settable using env vars
	t.Setenv("ETCD_A", "foo")
	// and command-line flags
	require.NoError(t, fs.Set("b", "bar"))

	// first verify that flags are as expected before reading the env
	for f, want := range map[string]string{
		"a": "",
		"b": "bar",
	} {
		got := fs.Lookup(f).Value.String()
		require.Equalf(t, want, got, "flag %q=%q, want %q", f, got, want)
	}

	// now read the env and verify flags were updated as expected
	require.NoError(t, SetFlagsFromEnv(zaptest.NewLogger(t), "ETCD", fs))
	for f, want := range map[string]string{
		"a": "foo",
		"b": "bar",
	} {
		got := fs.Lookup(f).Value.String()
		assert.Equalf(t, want, got, "flag %q=%q, want %q", f, got, want)
	}
}

func TestSetFlagsFromEnvBad(t *testing.T) {
	// now verify that an error is propagated