Add more information for SAML2 tests failure

servlet/java-configuration/saml2/login/src/integTest/java/example/Saml2JavaConfigurationITests.java

@@ -82,7 +82,19 @@ public class Saml2JavaConfigurationITests {
 		HtmlElement rpLogoutButton = home.getHtmlElementById("rp_logout_button");
 		HtmlPage loginPage = rpLogoutButton.click();
 		this.webClient.waitForBackgroundJavaScript(10000);
-		assertThat(loginPage.getUrl().getFile()).isEqualTo("/login?logout");
+		List<String> urls = new ArrayList<>();
+		urls.add(loginPage.getUrl().getFile());
+		urls.add(((HtmlPage) this.webClient.getCurrentWindow().getEnclosedPage()).getUrl().getFile());
+		assertThat(urls).withFailMessage(() -> {
+			// @formatter:off
+			String builder = loginPage.asXml()
+					+ "\n\n\n"
+					+ "Enclosing Page"
+					+ "\n\n\n"
+					+ ((HtmlPage) this.webClient.getCurrentWindow().getEnclosedPage()).asXml();
+			// @formatter:on
+			return builder;
+		}).contains("/login?logout");
 	}
 
 	private void performLogin() throws Exception {