[[test]]
= Testing

This section describes the testing support provided by Spring Security.

[TIP]
====
To use the Spring Security test support, you must include `spring-security-test-{spring-security-version}.jar` as a dependency of your project.
====

[[test-method]]
== Testing Method Security

This section demonstrates how to use Spring Security's Test support to test method based security.
We first introduce a `MessageService` that requires the user to be authenticated in order to access it.

[source,java]
----
public class HelloMessageService implements MessageService {

	@PreAuthorize("authenticated")
	public String getMessage() {
		Authentication authentication = SecurityContextHolder.getContext()
															.getAuthentication();
		return "Hello " + authentication;
	}
}
----

The result of `getMessage` is a String saying "Hello" to the current Spring Security `Authentication`.
An example of the output is displayed below.

[source,text]
----
Hello org.springframework.security.authentication.UsernamePasswordAuthenticationToken@ca25360: Principal: org.springframework.security.core.userdetails.User@36ebcb: Username: user; Password: [PROTECTED]; Enabled: true; AccountNonExpired: true; credentialsNonExpired: true; AccountNonLocked: true; Granted Authorities: ROLE_USER; Credentials: [PROTECTED]; Authenticated: true; Details: null; Granted Authorities: ROLE_USER
----

[[test-method-setup]]
=== Security Test Setup

Before we can use Spring Security Test support, we must perform some setup. An example can be seen below:

[source,java]
----
@RunWith(SpringJUnit4ClassRunner.class) // <1>
@ContextConfiguration // <2>
public class WithMockUserTests {
----

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.
If you are using reactive method security, you will also need `ReactorContextTestExecutionListener` which populates `ReactiveSecurityContextHolder`.
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`.

Remember we added the `@PreAuthorize` annotation to our `HelloMessageService` and so it requires an authenticated user to invoke it.
If we ran the following test, we would expect the following test will pass:

[source,java]
----
@Test(expected = AuthenticationCredentialsNotFoundException.class)
public void getMessageUnauthenticated() {
	messageService.getMessage();
}
----

[[test-method-withmockuser]]
=== @WithMockUser

The question is "How could we most easily run the test as a specific user?"
The answer is to use `@WithMockUser`.
The following test will be run as a user with the username "user", the password "password", and the roles "ROLE_USER".

[source,java]
----
@Test
@WithMockUser
public void getMessageWithMockUser() {
String message = messageService.getMessage();
...
}
----

Specifically the following is true:

* The user with the username "user" does not have to exist since we are mocking the user
* The `Authentication` that is populated in the `SecurityContext` is of type `UsernamePasswordAuthenticationToken`
* The principal on the `Authentication` is Spring Security's `User` object
* The `User` will have the username of "user", the password "password", and a single `GrantedAuthority` named "ROLE_USER" is used.

Our example is nice because we are able to leverage a lot of defaults.
What if we wanted to run the test with a different username?
The following test would run with the username "customUser". Again, the user does not need to actually exist.

[source,java]
----
@Test
@WithMockUser("customUsername")
public void getMessageWithMockUserCustomUsername() {
	String message = messageService.getMessage();
...
}
----

We can also easily customize the roles.
For example, this test will be invoked with the username "admin" and the roles "ROLE_USER" and "ROLE_ADMIN".

[source,java]
----
@Test
@WithMockUser(username="admin",roles={"USER","ADMIN"})
public void getMessageWithMockUserCustomUser() {
	String message = messageService.getMessage();
	...
}
----

If we do not want the value to automatically be prefixed with ROLE_ we can leverage the authorities attribute.
For example, this test will be invoked with the username "admin" and the authorities "USER" and "ADMIN".

[source,java]
----
@Test
@WithMockUser(username = "admin", authorities = { "ADMIN", "USER" })
public void getMessageWithMockUserCustomAuthorities() {
	String message = messageService.getMessage();
	...
}
----

Of course it can be a bit tedious placing the annotation on every test method.
Instead, we can place the annotation at the class level and every test will use the specified user.
For example, the following would run every test with a user with the username "admin", the password "password", and the roles "ROLE_USER" and "ROLE_ADMIN".

[source,java]
----
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
@WithMockUser(username="admin",roles={"USER","ADMIN"})
public class WithMockUserTests {
----


[[test-method-withanonymoususer]]
=== @WithAnonymousUser

Using `@WithAnonymousUser` allows running as an anonymous user.
This is especially convenient when you wish to run most of your tests with a specific user, but want to run a few tests as an anonymous user.
For example, the following will run withMockUser1 and withMockUser2 using <<test-method-withmockuser,@WithMockUser>> and anonymous as an anonymous user.

[source,java]
----
@RunWith(SpringJUnit4ClassRunner.class)
@WithMockUser
public class WithUserClassLevelAuthenticationTests {

	@Test
	public void withMockUser1() {
	}

	@Test
	public void withMockUser2() {
	}

	@Test
	@WithAnonymousUser
	public void anonymous() throws Exception {
		// override default to run as anonymous user
	}
}
----


[[test-method-withuserdetails]]
=== @WithUserDetails

While `@WithMockUser` is a very convenient way to get started, it may not work in all instances.
For example, it is common for applications to expect that the `Authentication` principal be of a specific type.
This is done so that the application can refer to the principal as the custom type and reduce coupling on Spring Security.

The custom principal is often times returned by a custom `UserDetailsService` that returns an object that implements both `UserDetails` and the custom type.
For situations like this, it is useful to create the test user using the custom `UserDetailsService`.
That is exactly what `@WithUserDetails` does.

Assuming we have a `UserDetailsService` exposed as a bean, the following test will be invoked with an `Authentication` of type `UsernamePasswordAuthenticationToken` and a principal that is returned from the `UserDetailsService` with the username of "user".

[source,java]
----
@Test
@WithUserDetails
public void getMessageWithUserDetails() {
	String message = messageService.getMessage();
	...
}
----

We can also customize the username used to lookup the user from our `UserDetailsService`.
For example, this test would be executed with a principal that is returned from the `UserDetailsService` with the username of "customUsername".

[source,java]
----
@Test
@WithUserDetails("customUsername")
public void getMessageWithUserDetailsCustomUsername() {
	String message = messageService.getMessage();
	...
}
----

We can also provide an explicit bean name to look up the `UserDetailsService`.
For example, this test would look up the username of "customUsername" using the `UserDetailsService` with the bean name "myUserDetailsService".

[source,java]
----
@Test
@WithUserDetails(value="customUsername", userDetailsServiceBeanName="myUserDetailsService")
public void getMessageWithUserDetailsServiceBeanName() {
	String message = messageService.getMessage();
	...
}
----

Like `@WithMockUser` we can also place our annotation at the class level so that every test uses the same user.
However unlike `@WithMockUser`, `@WithUserDetails` requires the user to exist.

[[test-method-withsecuritycontext]]
=== @WithSecurityContext

We have seen that `@WithMockUser` is an excellent choice if we are not using a custom `Authentication` principal.
Next we discovered that `@WithUserDetails` would allow us to use a custom `UserDetailsService` to create our `Authentication` principal but required the user to exist.
We will now see an option that allows the most flexibility.

We can create our own annotation that uses the `@WithSecurityContext` to create any `SecurityContext` we want.
For example, we might create an annotation named `@WithMockCustomUser` as shown below:

[source,java]
----
@Retention(RetentionPolicy.RUNTIME)
@WithSecurityContext(factory = WithMockCustomUserSecurityContextFactory.class)
public @interface WithMockCustomUser {

	String username() default "rob";

	String name() default "Rob Winch";
}
----

You can see that `@WithMockCustomUser` is annotated with the `@WithSecurityContext` annotation.
This is what signals to Spring Security Test support that we intend to create a `SecurityContext` for the test.
The `@WithSecurityContext` annotation requires we specify a `SecurityContextFactory` that will create a new `SecurityContext` given our `@WithMockCustomUser` annotation.
You can find our `WithMockCustomUserSecurityContextFactory` implementation below:

[source,java]
----
public class WithMockCustomUserSecurityContextFactory
	implements WithSecurityContextFactory<WithMockCustomUser> {
	@Override
	public SecurityContext createSecurityContext(WithMockCustomUser customUser) {
		SecurityContext context = SecurityContextHolder.createEmptyContext();

		CustomUserDetails principal =
			new CustomUserDetails(customUser.name(), customUser.username());
		Authentication auth =
			new UsernamePasswordAuthenticationToken(principal, "password", principal.getAuthorities());
		context.setAuthentication(auth);
		return context;
	}
}
----

We can now annotate a test class or a test method with our new annotation and Spring Security's `WithSecurityContextTestExecutionListener` will ensure that our `SecurityContext` is populated appropriately.

When creating your own `WithSecurityContextFactory` implementations, it is nice to know that they can be annotated with standard Spring annotations.
For example, the `WithUserDetailsSecurityContextFactory` uses the `@Autowired` annotation to acquire the `UserDetailsService`:

[source,java]
----
final class WithUserDetailsSecurityContextFactory
	implements WithSecurityContextFactory<WithUserDetails> {

	private UserDetailsService userDetailsService;

	@Autowired
	public WithUserDetailsSecurityContextFactory(UserDetailsService userDetailsService) {
		this.userDetailsService = userDetailsService;
	}

	public SecurityContext createSecurityContext(WithUserDetails withUser) {
		String username = withUser.value();
		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();
		context.setAuthentication(authentication);
		return context;
	}
}
----

[[test-method-meta-annotations]]
=== Test Meta Annotations

If you reuse the same user within your tests often, it is not ideal to have to repeatedly specify the attributes.
For example, if there are many tests related to an administrative user with the username "admin" and the roles `ROLE_USER` and `ROLE_ADMIN` you would have to write:

[source,java]
----
@WithMockUser(username="admin",roles={"USER","ADMIN"})
----

Rather than repeating this everywhere, we can use a meta annotation.
For example, we could create a meta annotation named `WithMockAdmin`:

[source,java]
----
@Retention(RetentionPolicy.RUNTIME)
@WithMockUser(value="rob",roles="ADMIN")
public @interface WithMockAdmin { }
----

Now we can use `@WithMockAdmin` in the same way as the more verbose `@WithMockUser`.

Meta annotations work with any of the testing annotations described above.
For example, this means we could create a meta annotation for `@WithUserDetails("admin")` as well.


[[test-mockmvc]]
== Spring MVC Test Integration

Spring Security provides comprehensive integration with http://docs.spring.io/spring/docs/current/spring-framework-reference/html/testing.html#spring-mvc-test-framework[Spring MVC Test]

[[test-mockmvc-setup]]
=== Setting Up MockMvc and Spring Security

In order to use Spring Security with Spring MVC Test it is necessary to add the Spring Security `FilterChainProxy` as a `Filter`.
It is also necessary to add Spring Security's `TestSecurityContextHolderPostProcessor` to support <<Running as a User in Spring MVC Test with Annotations,Running as a User in Spring MVC Test with Annotations>>.
This can be done using Spring Security's `SecurityMockMvcConfigurers.springSecurity()`.
For example:

NOTE: Spring Security's testing support requires spring-test-4.1.3.RELEASE or greater.

[source,java]
----

import static org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.*;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
@WebAppConfiguration
public class CsrfShowcaseTests {

	@Autowired
	private WebApplicationContext context;

	private MockMvc mvc;

	@Before
	public void setup() {
		mvc = MockMvcBuilders
				.webAppContextSetup(context)
				.apply(springSecurity()) // <1>
				.build();
	}

...
----

<1> `SecurityMockMvcConfigurers.springSecurity()` will perform all of the initial setup we need to integrate Spring Security with Spring MVC Test

[[test-mockmvc-smmrpp]]
=== SecurityMockMvcRequestPostProcessors

Spring MVC Test provides a convenient interface called a `RequestPostProcessor` that can be used to modify a request.
Spring Security provides a number of `RequestPostProcessor` implementations that make testing easier.
In order to use Spring Security's `RequestPostProcessor` implementations ensure the following static import is used:

[source,java]
----
import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.*;
----

[[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]
----
mvc
	.perform(post("/").with(csrf()))
----

If you like you can include CSRF token in the header instead:

[source,java]
----
mvc
	.perform(post("/").with(csrf().asHeader()))
----

You can also test providing an invalid CSRF token using the following:

[source,java]
----
mvc
	.perform(post("/").with(csrf().useInvalidToken()))
----

[[test-mockmvc-securitycontextholder]]
==== Running a Test as a User in Spring MVC Test

It is often desirable to run tests as a specific user.
There are two simple ways of populating the user:

* <<Running as a User in Spring MVC Test with RequestPostProcessor,Running as a User in Spring MVC Test with RequestPostProcessor>>
* <<Running as a User in Spring MVC Test with Annotations,Running as a User in Spring MVC Test with Annotations>>

[[test-mockmvc-securitycontextholder-rpp]]
==== Running as a User in Spring MVC Test with RequestPostProcessor

There are a number of options available to associate a user to the current `HttpServletRequest`.
For example, the following will run as a user (which does not need to exist) with the username "user", the password "password", and the role "ROLE_USER":

[NOTE]
====
The support works by associating the user to the `HttpServletRequest`.
To associate the request to the `SecurityContextHolder` you need to ensure that the `SecurityContextPersistenceFilter` is associated with the `MockMvc` instance.
A few ways to do this are:

* Invoking <<test-mockmvc-setup,apply(springSecurity())>>
* Adding Spring Security's `FilterChainProxy` to `MockMvc`
* Manually adding `SecurityContextPersistenceFilter` to the `MockMvc` instance may make sense when using `MockMvcBuilders.standaloneSetup`
====

[source,java]
----
mvc
	.perform(get("/").with(user("user")))
----

You can easily make customizations.
For example, the following will run as a user (which does not need to exist) with the username "admin", the password "pass", and the roles "ROLE_USER" and "ROLE_ADMIN".

[source,java]
----
mvc
	.perform(get("/admin").with(user("admin").password("pass").roles("USER","ADMIN")))
----

If you have a custom `UserDetails` that you would like to use, you can easily specify that as well.
For example, the following will use the specified `UserDetails` (which does not need to exist) to run with a `UsernamePasswordAuthenticationToken` that has a principal of the specified `UserDetails`:

[source,java]
----
mvc
	.perform(get("/").with(user(userDetails)))
----

You can run as anonymous user using the following:

[source,java]
----
mvc
	.perform(get("/").with(anonymous()))
----

This is especially useful if you are running with a default user and wish to execute a few requests as an anonymous user.

If you want a custom `Authentication` (which does not need to exist) you can do so using the following:

[source,java]
----
mvc
	.perform(get("/").with(authentication(authentication)))
----

You can even customize the `SecurityContext` using the following:

[source,java]
----
mvc
	.perform(get("/").with(securityContext(securityContext)))
----

We can also ensure to run as a specific user for every request by using ``MockMvcBuilders``'s default request.
For example, the following will run as a user (which does not need to exist) with the username "admin", the password "password", and the role "ROLE_ADMIN":

[source,java]
----
mvc = MockMvcBuilders
		.webAppContextSetup(context)
		.defaultRequest(get("/").with(user("user").roles("ADMIN")))
		.apply(springSecurity())
		.build();
----

If you find you are using the same user in many of your tests, it is recommended to move the user to a method.
For example, you can specify the following in your own class named `CustomSecurityMockMvcRequestPostProcessors`:

[source,java]
----
public static RequestPostProcessor rob() {
	return user("rob").roles("ADMIN");
}
----

Now you can perform a static import on `SecurityMockMvcRequestPostProcessors` and use that within your tests:

[source,java]
----
import static sample.CustomSecurityMockMvcRequestPostProcessors.*;

...

mvc
	.perform(get("/").with(rob()))
----

===== Running as a User in Spring MVC Test with Annotations

As an alternative to using a `RequestPostProcessor` to create your user, you can use annotations described in <<Testing Method Security>>.
For example, the following will run the test with the user with username "user", password "password", and role "ROLE_USER":

[source,java]
----
@Test
@WithMockUser
public void requestProtectedUrlWithUser() throws Exception {
mvc
		.perform(get("/"))
		...
}
----

Alternatively, the following will run the test with the user with username "user", password "password", and role "ROLE_ADMIN":

[source,java]
----
@Test
@WithMockUser(roles="ADMIN")
public void requestProtectedUrlWithUser() throws Exception {
mvc
		.perform(get("/"))
		...
}
----

==== Testing HTTP Basic Authentication

While it has always been possible to authenticate with HTTP Basic, it was a bit tedious to remember the header name, format, and encode the values.
Now this can be done using Spring Security's `httpBasic` `RequestPostProcessor`.
For example, the snippet below:

[source,java]
----
mvc
	.perform(get("/").with(httpBasic("user","password")))
----

will attempt to use HTTP Basic to authenticate a user with the username "user" and the password "password" by ensuring the following header is populated on the HTTP Request:

[source,text]
----
Authorization: Basic dXNlcjpwYXNzd29yZA==
----

=== SecurityMockMvcRequestBuilders

Spring MVC Test also provides a `RequestBuilder` interface that can be used to create the `MockHttpServletRequest` used in your test.
Spring Security provides a few `RequestBuilder` implementations that can be used to make testing easier.
In order to use Spring Security's `RequestBuilder` implementations ensure the following static import is used:

[source,java]
----
import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestBuilders.*;
----

==== Testing Form Based Authentication

You can easily create a request to test a form based authentication using Spring Security's testing support.
For example, the following will submit a POST to "/login" with the username "user", the password "password", and a valid CSRF token:

[source,java]
----
mvc
	.perform(formLogin())
----

It is easy to customize the request.
For example, the following will submit a POST to "/auth" with the username "admin", the password "pass", and a valid CSRF token:

[source,java]
----
mvc
	.perform(formLogin("/auth").user("admin").password("pass"))
----

We can also customize the parameters names that the username and password are included on.
For example, this is the above request modified to include the username on the HTTP parameter "u" and the password on the HTTP parameter "p".

[source,java]
----
mvc
	.perform(formLogin("/auth").user("u","admin").password("p","pass"))
----

[[test-logout]]
==== Testing Logout

While fairly trivial using standard Spring MVC Test, you can use Spring Security's testing support to make testing log out easier.
For example, the following will submit a POST to "/logout" with a valid CSRF token:

[source,java]
----
mvc
	.perform(logout())
----

You can also customize the URL to post to.
For example, the snippet below will submit a POST to "/signout" with a valid CSRF token:

[source,java]
----
mvc
	.perform(logout("/signout"))
----

=== SecurityMockMvcResultMatchers

At times it is desirable to make various security related assertions about a request.
To accommodate this need, Spring Security Test support implements Spring MVC Test's `ResultMatcher` interface.
In order to use Spring Security's `ResultMatcher` implementations ensure the following static import is used:

[source,java]
----
import static org.springframework.security.test.web.servlet.response.SecurityMockMvcResultMatchers.*;
----

==== Unauthenticated Assertion

At times it may be valuable to assert that there is no authenticated user associated with the result of a `MockMvc` invocation.
For example, you might want to test submitting an invalid username and password and verify that no user is authenticated.
You can easily do this with Spring Security's testing support using something like the following:

[source,java]
----
mvc
	.perform(formLogin().password("invalid"))
	.andExpect(unauthenticated());
----

==== Authenticated Assertion

It is often times that we must assert that an authenticated user exists.
For example, we may want to verify that we authenticated successfully.
We could verify that a form based login was successful with the following snippet of code:

[source,java]
----
mvc
	.perform(formLogin())
	.andExpect(authenticated());
----

If we wanted to assert the roles of the user, we could refine our previous code as shown below:

[source,java]
----
mvc
	.perform(formLogin().user("admin"))
	.andExpect(authenticated().withRoles("USER","ADMIN"));
----

Alternatively, we could verify the username:

[source,java]
----
mvc
	.perform(formLogin().user("admin"))
	.andExpect(authenticated().withUsername("admin"));
----

We can also combine the assertions:

[source,java]
----
mvc
	.perform(formLogin().user("admin").roles("USER","ADMIN"))
	.andExpect(authenticated().withUsername("admin"));
----

We can also make arbitrary assertions on the authentication

[source,java]
----
mvc
	.perform(formLogin())
	.andExpect(authenticated().withAuthentication(auth ->
		assertThat(auth).isInstanceOf(UsernamePasswordAuthenticationToken.class)));
----

[[test-webflux]]
== WebFlux Support

Spring Security provides test integration with Spring WebFlux for both method security and WebFlux.
You can find a complete working sample at {gh-samples-url}/javaconfig/hellowebflux-method[hellowebflux-method]


[[test-erms]]
=== Reactive Method Security

For example, we can test our example from <<jc-erms>> using the same setup and annotations we did in <<test-method>>.
Here is a minimal sample of what we can do:

[source,java]
----
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = HelloWebfluxMethodApplication.class)
public class HelloWorldMessageServiceTests {
	@Autowired
	HelloWorldMessageService messages;

	@Test
	public void messagesWhenNotAuthenticatedThenDenied() {
		StepVerifier.create(this.messages.findMessage())
			.expectError(AccessDeniedException.class)
			.verify();
	}

	@Test
	@WithMockUser
	public void messagesWhenUserThenDenied() {
		StepVerifier.create(this.messages.findMessage())
			.expectError(AccessDeniedException.class)
			.verify();
	}

	@Test
	@WithMockUser(roles = "ADMIN")
	public void messagesWhenAdminThenOk() {
		StepVerifier.create(this.messages.findMessage())
			.expectNext("Hello World!")
			.verifyComplete();
	}
}
----

[[test-webtestclient]]
=== WebTestClientSupport

Spring Security provides integration with `WebTestClient`.
The basic setup looks like this:

[source,java]
----
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = HelloWebfluxMethodApplication.class)
public class HelloWebfluxMethodApplicationTests {
	@Autowired
	ApplicationContext context;

	WebTestClient rest;

	@Before
	public void setup() {
		this.rest = WebTestClient
			.bindToApplicationContext(this.context)
			// add Spring Security test Support
			.apply(springSecurity())
			.configureClient()
			.filter(basicAuthentication())
			.build();
	}
	// ...
}
----

==== Authentication

After applying the Spring Security support to `WebTestClient` we can use either annotations or `mutateWith` support.
For example:

[source,java]
----
@Test
public void messageWhenNotAuthenticated() throws Exception {
	this.rest
		.get()
		.uri("/message")
		.exchange()
		.expectStatus().isUnauthorized();
}

// --- WithMockUser ---

@Test
@WithMockUser
public void messageWhenWithMockUserThenForbidden() throws Exception {
	this.rest
		.get()
		.uri("/message")
		.exchange()
		.expectStatus().isEqualTo(HttpStatus.FORBIDDEN);
}

@Test
@WithMockUser(roles = "ADMIN")
public void messageWhenWithMockAdminThenOk() throws Exception {
	this.rest
		.get()
		.uri("/message")
		.exchange()
		.expectStatus().isOk()
		.expectBody(String.class).isEqualTo("Hello World!");
}

// --- mutateWith mockUser ---

@Test
public void messageWhenMutateWithMockUserThenForbidden() throws Exception {
	this.rest
		.mutateWith(mockUser())
		.get()
		.uri("/message")
		.exchange()
		.expectStatus().isEqualTo(HttpStatus.FORBIDDEN);
}

@Test
public void messageWhenMutateWithMockAdminThenOk() throws Exception {
	this.rest
		.mutateWith(mockUser().roles("ADMIN"))
		.get()
		.uri("/message")
		.exchange()
		.expectStatus().isOk()
		.expectBody(String.class).isEqualTo("Hello World!");
}
----


==== CSRF Support

Spring Security also provides support for CSRF testing with `WebTestClient`.
For example:

[source,java]
----
this.rest
	// provide a valid CSRF token
	.mutateWith(csrf())
	.post()
	.uri("/login")
	...
----
