@Test
public void emptyFiles() throws Exception {

	interceptor = new CommonsUploadMultipartInterceptor(request, parameters, config, validator, mockCreator);
		
	final List<FileItem> elements = new ArrayList<FileItem>();
	elements.add(new MockFileItem("thefile0", "", new byte[0]));
	
	when(request.getContentType()).thenReturn("multipart/form-data");
	when(request.getMethod()).thenReturn("POST");
	when(mockUpload.parseRequest(request)).thenReturn(elements);
	
	interceptor.intercept(stack, method, instance);
}