### Question:
JaxWsHandler extends SoapClientHandler<BindingProvider> { @Override public Object getHeader(BindingProvider soapClient, String headerName) { for (SOAPElement addedHeader : getContextHandlerFromClient(soapClient).getAddedHeaders()) { if (addedHeader.getNodeName().equals(headerName)) { return addedHeader; } } return null; } @Inject protected  JaxWsHandler(Provider<JaxWsSoapContextHandler> contextHandlerProvider); @Override void setEndpointAddress(BindingProvider soapClient, String endpointAddress); @Override Object getHeader(BindingProvider soapClient, String headerName); @Override void clearHeaders(BindingProvider soapClient); @Override void setHeader(BindingProvider soapClient, String namespace, String headerName,
      Object headerValue); void setHeaderChildString(BindingProvider soapClient, final String headerName,
      String childNamespace, String childName, String childValue); @Override void putAllHttpHeaders(BindingProvider soapClient, Map<String, String> headersMap); @Override void setCompression(BindingProvider soapClient, boolean compress); @Override BindingProvider createSoapClient(SoapServiceDescriptor soapServiceDescriptor); @Override void setRequestTimeout(BindingProvider bindingProvider, int timeout); @Override RemoteCallReturn invokeSoapCall(SoapCall<BindingProvider> soapCall); @Override String getEndpointAddress(BindingProvider soapClient); @Override SOAPHeaderElement createSoapHeaderElement(QName qName);  }### Answer:
@Test public void testGetHeader() { String namespace = "namespace"; String headerName = "headerName"; SOAPElement headerValue = Mockito.mock(SOAPElement.class); when(mockSoapClient.getBinding()).thenReturn(mockBinding); when(mockBinding.getHandlerChain()).thenReturn(handlerChain); when(headerValue.getNodeName()).thenReturn(headerName); assertEquals(null, jaxWsHandler.getHeader(mockSoapClient, headerName)); jaxWsHandler.setHeader(mockSoapClient, namespace, headerName, headerValue); assertEquals(headerValue, jaxWsHandler.getHeader(mockSoapClient, headerName)); }