@Test
 public void withOptionArgsOnly() {
   CommandLinePropertySource<?> ps = new SimpleCommandLinePropertySource("--o1=v1", "--o2");
   assertThat(ps.containsProperty("o1"), is(true));
   assertThat(ps.containsProperty("o2"), is(true));
   assertThat(ps.containsProperty("o3"), is(false));
   assertThat(ps.getProperty("o1"), equalTo("v1"));
   assertThat(ps.getProperty("o2"), equalTo(""));
   assertThat(ps.getProperty("o3"), nullValue());
 }
  @Test
  public void withDefaultNonOptionArgsNameAndNonOptionArgsPresent() {
    CommandLinePropertySource<?> ps =
        new SimpleCommandLinePropertySource("--o1=v1", "noa1", "--o2", "noa2");

    assertThat(ps.containsProperty("nonOptionArgs"), is(true));
    assertThat(ps.containsProperty("o1"), is(true));
    assertThat(ps.containsProperty("o2"), is(true));

    String nonOptionArgs = ps.getProperty("nonOptionArgs");
    assertThat(nonOptionArgs, equalTo("noa1,noa2"));
  }