@SneakyThrows
    @Override
    public Integer call() throws Exception {
        super.call();

        PicocliRunner.call(App.class, "namespace", "--help");

        return 0;
    }
@Test
    void runWithNoParam() {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        System.setOut(new PrintStream(out));

        try (ApplicationContext ctx = ApplicationContext.builder().deduceEnvironment(false).start()) {
            String[] args = {};
            Integer call = PicocliRunner.call(NamespaceCommand.class, ctx, args);

            assertThat(call, is(0));
            assertThat(out.toString(), containsString("Usage: kestra namespace"));
        }
    }