test no such subcommand

subcommand_test.go

@@ -29,7 +29,7 @@ func TestSubcommandNotAPointerToStruct(t *testing.T) {
 func TestPositionalAndSubcommandNotAllowed(t *testing.T) {
 	var args struct {
 		A string    `arg:"positional"`
-		B struct{} `arg:"subcommand"`
+		B *struct{} `arg:"subcommand"`
 	}
 	_, err := NewParser(Config{}, &args)
 	assert.Error(t, err)
@@ -46,6 +46,16 @@ func TestMinimalSubcommand(t *testing.T) {
 	assert.NotNil(t, args.List)
 }
 
+func TestNoSuchSubcommand(t *testing.T) {
+	type listCmd struct {
+	}
+	var args struct {
+		List *listCmd `arg:"subcommand"`
+	}
+	err := parse("invalid", &args)
+	assert.Error(t, err)
+}
+
 func TestNamedSubcommand(t *testing.T) {
 	type listCmd struct {
 	}