### Question:
AbstractTraceeHandler implements SOAPHandler<SOAPMessageContext> { @Override public Set<QName> getHeaders() { return HANDLED_HEADERS; } AbstractTraceeHandler(TraceeBackend traceeBackend); @Override final boolean handleMessage(final SOAPMessageContext context); @Override void close(MessageContext context); @Override Set<QName> getHeaders();  }### Answer:
@Test public void shouldRegisterForTraceeHeaders() { assertThat(unit.getHeaders(), hasItem(TraceeConstants.SOAP_HEADER_QNAME)); }