@Test
public void specificSelectorShouldReturnSpecificNamespace() {

    assertThat(matcher.filterNamespaces("alexa", null), hasSize(1));
    assertThat(matcher.filterNamespaces("alexa", null), hasItem("alexa"));
    assertThat(matcher.filterNamespaces("magic", null), hasSize(1));
    assertThat(matcher.filterNamespaces("magic", null), hasItem("magic"));
    assertThat(matcher.filterNamespaces("magic2", null), hasSize(1));
    assertThat(matcher.filterNamespaces("magic2", null), hasItem("magic2"));
    assertThat(matcher.filterNamespaces("unknown", null), hasSize(1));
}