Log out user properly after changing own username

src/main/java/catering/users/UserController.java

@@ -65,8 +65,12 @@ public class UserController {
 	@PostMapping("/profile")
 	@PreAuthorize("isAuthenticated()")
 	public String editProfile(@LoggedIn UserAccount userAccount, @Valid ProfileForm form) {
+		String redirect = "redirect:/logout";
 		User user = userManagement.getUserByAccount(userAccount).get();
 
+		if (form.getUsername().equals(user.getUsername())) {
+			redirect = "redirect:/profile";
+		}
 		user.setUsername(form.getUsername());
 		user.setFullName(form.getFullName());
 		user.setAddress(form.getAddress());
@@ -78,7 +82,7 @@ public class UserController {
 		userManagement.save(user);
 
 		// by default the user gets logged out by salespoint after changing the user name
-		return "redirect:/profile";
+		return redirect;
 	}
 
 	@GetMapping("/profile/disable")

src/test/java/catering/users/UserControllerIntegrationTests.java

@@ -0,0 +1,42 @@
+package catering.users;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.test.context.support.WithMockUser;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+
+@AutoConfigureMockMvc
+@SpringBootTest
+class UserControllerIntegrationTests {
+	@Autowired
+	MockMvc mvc;
+
+	@BeforeEach
+	void init() throws Exception {
+		MockHttpServletRequestBuilder createCustomer = post("/register")
+			.param("username", "dieter")
+			.param("password", "123")
+			.param("fullName", "Dieter")
+			.param("address", "Baum Weg");
+		mvc.perform(createCustomer);
+	}
+
+	@Test
+	@WithMockUser(username = "dieter", password = "123")
+	void redirectAfterChangingOwnUsernameWithDifferentUsername() throws Exception {
+		MockHttpServletRequestBuilder createMessage = post("/profile")
+			.param("username", "diete")
+			.param("password", "123")
+			.param("fullName", "Dieter")
+			.param("address", "Baum Weg");
+		mvc.perform(createMessage).andExpect(redirectedUrl("/logout"));
+	}
+
+}