Add tests for invalid/missing token

Issue gh-14634

Author: sjohnr

docs/modules/ROOT/pages/servlet/exploits/csrf.adoc

@@ -1221,6 +1221,24 @@ public class CsrfTests {
 			.andExpect(header().string(HttpHeaders.LOCATION, "/"));
 	}
 
+	@Test
+	public void loginWhenInvalidCsrfTokenThenForbidden() throws Exception {
+		this.mockMvc.perform(post("/login").with(csrf().useInvalidToken())
+				.accept(MediaType.TEXT_HTML)
+				.param("username", "user")
+				.param("password", "password"))
+			.andExpect(status().isForbidden());
+	}
+
+	@Test
+	public void loginWhenMissingCsrfTokenThenForbidden() throws Exception {
+		this.mockMvc.perform(post("/login")
+				.accept(MediaType.TEXT_HTML)
+				.param("username", "user")
+				.param("password", "password"))
+			.andExpect(status().isForbidden());
+	}
+
 	@Test
 	@WithMockUser
 	public void logoutWhenValidCsrfTokenThenSuccess() throws Exception {
@@ -1264,6 +1282,24 @@ class CsrfTests {
 			.andExpect(header().string(HttpHeaders.LOCATION, "/"))
 	}
 
+	@Test
+	fun loginWhenInvalidCsrfTokenThenForbidden() {
+		mockMvc.perform(post("/login").with(csrf().useInvalidToken())
+				.accept(MediaType.TEXT_HTML)
+				.param("username", "user")
+				.param("password", "password"))
+			.andExpect(status().isForbidden)
+	}
+
+	@Test
+	fun loginWhenMissingCsrfTokenThenForbidden() {
+		mockMvc.perform(post("/login")
+				.accept(MediaType.TEXT_HTML)
+				.param("username", "user")
+				.param("password", "password"))
+			.andExpect(status().isForbidden)
+	}
+
 	@Test
 	@WithMockUser
 	@Throws(Exception::class)