public Set<String> getPropertyKeys() {
    return propertyToBundles.keySet();
  }
@Test
  public void introspect_all_available_properties() {
    assertThat(underTest.getPropertyKeys().contains("any")).isTrue();
    // Only in english
    assertThat(underTest.getPropertyKeys().contains("assignee")).isTrue();
    assertThat(underTest.getPropertyKeys().contains("sqale.page")).isTrue();
    assertThat(underTest.getPropertyKeys().contains("bla_bla_bla")).isFalse();
  }