How to test spring-security-oauth2 resource server security?

To test resource server security effectively, both with MockMvc and a RestTemplate it helps to configure an AuthorizationServer under src/test/java:

AuthorizationServer

@Configuration
@EnableAuthorizationServer
@SuppressWarnings("static-method")
class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {
    @Bean
    public JwtAccessTokenConverter accessTokenConverter() throws Exception {
        JwtAccessTokenConverter jwt = new JwtAccessTokenConverter();
        jwt.setSigningKey(SecurityConfig.key("rsa"));
        jwt.setVerifierKey(SecurityConfig.key("rsa.pub"));
        jwt.afterPropertiesSet();
        return jwt;
    }

    @Autowired
    private AuthenticationManager   authenticationManager;

    @Override
    public void configure(final AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints
        .authenticationManager(authenticationManager)
        .accessTokenConverter(accessTokenConverter());
    }

    @Override
    public void configure(final ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
        .withClient("myclientwith")
        .authorizedGrantTypes("password")
        .authorities("myauthorities")
        .resourceIds("myresource")
        .scopes("myscope")

        .and()
        .withClient("myclientwithout")
        .authorizedGrantTypes("password")
        .authorities("myauthorities")
        .resourceIds("myresource")
        .scopes(UUID.randomUUID().toString());
    }
}

Integration test
For integration tests one can then simply use built in OAuth2 test support rule and annotions:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = MyApp.class)
@WebIntegrationTest(randomPort = true)
@OAuth2ContextConfiguration(MyDetails.class)
public class MyControllerIT implements RestTemplateHolder {
    @Value("http://localhost:${local.server.port}")
    @Getter
    String                      host;

    @Getter
    @Setter
    RestOperations              restTemplate    = new TestRestTemplate();

    @Rule
    public OAuth2ContextSetup   context         = OAuth2ContextSetup.standard(this);

    @Test
    public void testHelloOAuth2WithRole() {
        ResponseEntity<String> entity = getRestTemplate().getForEntity(host + "/hello", String.class);
        assertTrue(entity.getStatusCode().is2xxSuccessful());
    }
}

class MyDetails extends ResourceOwnerPasswordResourceDetails {
    public MyDetails(final Object obj) {
        MyControllerIT it = (MyControllerIT) obj;
        setAccessTokenUri(it.getHost() + "/oauth/token");
        setClientId("myclientwith");
        setUsername("user");
        setPassword("password");
    }
}

MockMvc test
Testing with MockMvc is also possible, but needs a little helper class to get a RequestPostProcessor that sets the Authorization: Bearer <token> header on requests:

@Component
public class OAuthHelper {
    // For use with MockMvc
    public RequestPostProcessor bearerToken(final String clientid) {
        return mockRequest -> {
            OAuth2AccessToken token = createAccessToken(clientid);
            mockRequest.addHeader("Authorization", "Bearer " + token.getValue());
            return mockRequest;
        };
    }

    @Autowired
    ClientDetailsService                clientDetailsService;
    @Autowired
    AuthorizationServerTokenServices    tokenservice;

    OAuth2AccessToken createAccessToken(final String clientId) {
        // Look up authorities, resourceIds and scopes based on clientId
        ClientDetails client = clientDetailsService.loadClientByClientId(clientId);
        Collection<GrantedAuthority> authorities = client.getAuthorities();
        Set<String> resourceIds = client.getResourceIds();
        Set<String> scopes = client.getScope();

        // Default values for other parameters
        Map<String, String> requestParameters = Collections.emptyMap();
        boolean approved = true;
        String redirectUrl = null;
        Set<String> responseTypes = Collections.emptySet();
        Map<String, Serializable> extensionProperties = Collections.emptyMap();

        // Create request
        OAuth2Request oAuth2Request = new OAuth2Request(requestParameters, clientId, authorities, approved, scopes,
                resourceIds, redirectUrl, responseTypes, extensionProperties);

        // Create OAuth2AccessToken
        User userPrincipal = new User("user", "", true, true, true, true, authorities);
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userPrincipal, null, authorities);
        OAuth2Authentication auth = new OAuth2Authentication(oAuth2Request, authenticationToken);
        return tokenservice.createAccessToken(auth);
    }
}

Your MockMvc tests must then get a RequestPostProcessor from the OauthHelper class and pass it when making requests:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = MyApp.class)
@WebAppConfiguration
public class MyControllerTest {
    @Autowired
    private WebApplicationContext   webapp;

    private MockMvc                 mvc;

    @Before
    public void before() {
        mvc = MockMvcBuilders.webAppContextSetup(webapp)
                .apply(springSecurity())
                .alwaysDo(print())
                .build();
    }

    @Autowired
    private OAuthHelper helper;

    @Test
    public void testHelloWithRole() throws Exception {
        RequestPostProcessor bearerToken = helper.bearerToken("myclientwith");
        mvc.perform(get("/hello").with(bearerToken)).andExpect(status().isOk());
    }

    @Test
    public void testHelloWithoutRole() throws Exception {
        RequestPostProcessor bearerToken = helper.bearerToken("myclientwithout");
        mvc.perform(get("/hello").with(bearerToken)).andExpect(status().isForbidden());
    }
}

A full sample project is available on GitHub:
https://github.com/timtebeek/resource-server-testing