Test for options.

options.go

@@ -36,5 +36,8 @@ func HelpContext(context map[string]interface{}) Option {
 
 // Writers overrides the default writers. Useful for testing or interactive use.
 func Writers(stdout, stderr io.Writer) Option {
-	return func(k *Kong) { k.stdout = stdout }
+	return func(k *Kong) {
+		k.stdout = stdout
+		k.stderr = stderr
+	}
 }

options_test.go

@@ -0,0 +1,18 @@
+package kong
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOptions(t *testing.T) {
+	var cli struct{}
+	p, err := New(&cli, Name("name"), Description("description"), Writers(nil, nil), ExitFunction(nil))
+	require.NoError(t, err)
+	require.Equal(t, "name", p.Model.Name)
+	require.Equal(t, "description", p.Model.Help)
+	require.Nil(t, p.stdout)
+	require.Nil(t, p.stderr)
+	require.Nil(t, p.terminate)
+}