cxf request scoped bean not working in unit test (soap)

CXF soap application, using following versions:

springBootVersion = 1.2.3.RELEASE
springVersion     = '4.1.6.RELEASE'
cxfVersion        = '3.1.0'
junitVersion      = '4.12'

I have a spring bean with a request scope:

@Component
@Scope( value=WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS )
public class RequestScopedClass

which I fetch dynamically from ApplicationContext in my CXF endpoint implementation:

@Component
@WebService(endpointInterface = "ch.xyz.PaymentServiceInterface" )
public class PaymentServiceImpl implements PaymentServiceInterface
{
    ...
    RequestScopedClass rsc = appCtxt.getBean( RequestScopedClass.class );
    rsc.doSomething();

My goal is to test the frontend of the soap service by simulating a client which connects to the listener port etc., ensuring that the whole cxf stack with the interceptor chain (including my custom interceptors) is executed. I managed to setup this configuration by including the

org.apache.cxf:cxf-rt-transports-http-jetty

dependency and starting the endpoint in test setup:

String address = "http://0.0.0.0:8080/";
myEndpoint = Endpoint.publish( address, new PaymentServiceImpl() );

Running the test throws BeanCreationException in call to rsc.doSomething():

Error creating bean with name 'scopedTarget.requestScopedEnvironment': Scope 'request' is not active ...

If I change the proxyMode to one of the three other possibilites, the same exception is already thrown when fetching the bean from the appCtxt.

The test is annotated by

@RunWith( SpringJUnit4ClassRunner.class )
@ContextConfiguration( classes = {
                               ...,
                               RequestScopedClass.class
                             }
)
@WebAppConfiguration

If the application is started by "gradle bootrun" on command line and the soap request is done by the chrome postman application everything is fine and I get the expected soap response.

What can I do that there is a valid request scope when executing the cxf soap server in a unit test?