@Override
  @SuppressFBWarnings(value = "EI_EXPOSE_REP")
  public ImmutableSet<String> getSupportedProperties() {
    return SUPPORTED_PROPERTIES;
  }
@Test
  public void shouldGetSupportedProperties() {
    // Given:
    final ProtobufProperties properties = new ProtobufProperties(ImmutableMap.of());

    // When:
    final ImmutableSet<String> supportedProperties = properties.getSupportedProperties();

    // Then:
    assertThat(supportedProperties, is(ProtobufProperties.SUPPORTED_PROPERTIES));
  }