anchor.diff:  
   We could also specify some optional arguments:
   
  -
   [source,java]
   ----
  -WebClient webClient;
  +WebDriver driver;
   
   @Before
   public void setup() {
  -	webClient = MockMvcWebClientBuilder
  +	driver = MockMvcHtmlUnitDriverBuilder
   		// demonstrates applying a MockMvcConfigurer (Spring Security)
   		.webAppContextSetup(context, springSecurity())
   		// for illustration only - defaults to ""
   		.contextPath("")
  -		// By default MockMvc is used for localhost only
  +		// By default MockMvc is used for localhost only;
   		// the following will use MockMvc for example.com and example.org too
   		.useMockMvcForHosts("example.com","example.org")
   		.build();
  
positive.code: ----
  @After
  public void destroy() {
  	if(driver != null) {
  		driver.close();
  	}
  }
  
negative.code: ----
  
  This is more verbose, but by building the `WebClient` with a `MockMvc` instance we have
  the full power of `MockMvc` at our fingertips.
  
  [TIP]
  ====
  