anchor.diff:  
   	public SecurityContext createSecurityContext(WithUserDetails withUser) {
   		String username = withUser.value();
  -		Assert.hasLength(username, "value() must be non empty String");
  +		Assert.hasLength(username, "value() must be non-empty String");
   		UserDetails principal = userDetailsService.loadUserByUsername(username);
   		Authentication authentication = new UsernamePasswordAuthenticationToken(principal, principal.getPassword(), principal.getAuthorities());
   		SecurityContext context = SecurityContextHolder.createEmptyContext();
  
positive.code: 
  This is a basic example of how to setup Spring Security Test. The highlights are:
  
  <1> `@RunWith` instructs the spring-test module that it should create an ApplicationContext This is no different than using the existing Spring Test support. For additional information, refer to the http://docs.spring.io/spring-framework/docs/4.0.x/spring-framework-reference/htmlsingle/#integration-testing-annotations-standard[Spring Reference]
  <2> `@ContextConfiguration` instructs the spring-test the configuration to use to create the `ApplicationContext`. Since no configuration is specified, the default configuration locations will be tried. This is no different than using the existing Spring Test support. For additional information, refer to the http://docs.spring.io/spring-framework/docs/4.0.x/spring-framework-reference/htmlsingle/#testcontext-ctx-management[Spring Reference]
  
  NOTE: Spring Security hooks into Spring Test support using the  `WithSecurityContextTestExecutionListener` which will ensure our tests are ran with the correct user.
  It does this by populating the `SecurityContextHolder` prior to running our tests.
  After the test is done, it will clear out the `SecurityContextHolder`.
  If you only need Spring Security related support, you can replace `@ContextConfiguration` with `@SecurityTestExecutionListeners`.
  
negative.code: [[test-mockmvc-csrf]]
  ==== Testing with CSRF Protection
  
  When testing any non-safe HTTP methods and using Spring Security's CSRF protection, you must be sure to include a valid CSRF Token in the request.
  To specify a valid CSRF token as a request parameter using the following:
  
  [source,java]
  