@Test
public void doForwardWithoutPlaceholders() {

    final Map<String, String> headers = createValidHeaders();
    underTest.configure(mappingConfig, createMapperConfig(THING_TEMPLATE_WITHOUT_PLACEHOLDERS, COMMAND_HEADERS));
    final ExternalMessage externalMessage = ExternalMessageFactory.newExternalMessageBuilder(headers).build();
    final List<Adaptable> mappingResult = underTest.map(externalMessage);
    final Signal<?> firstMappedSignal = getFirstMappedSignal(mappingResult);
    assertThat(firstMappedSignal).isInstanceOf(CreateThing.class);
    final CreateThing createThing = (CreateThing) firstMappedSignal;
    final Thing expectedThing =
            createExpectedThing("some:validThingId!", "some:validPolicyId!", "some:validGatewayId!");
    assertThat(createThing.getThing().getEntityId()).isEqualTo(expectedThing.getEntityId());
    assertThat(createThing.getThing().getPolicyEntityId()).isEqualTo(expectedThing.getPolicyEntityId());
}