Add Alert assert messages

(cherry picked from commit 9f847fa)

testsuite/integration-arquillian/tests/other/console/src/test/java/org/keycloak/testsuite/console/AbstractConsoleTest.java

@@ -107,13 +107,13 @@ public abstract class AbstractConsoleTest extends AbstractAuthTest {
 
     public void assertAlertSuccess() {
         alert.waitUntilPresentAndClassSet();
-        assertTrue(alert.isSuccess());
+        assertTrue("Is not success; @class=" + alert.getAttributeClass(), alert.isSuccess());
         alert.close();
     }
 
     public void assertAlertDanger() {
         alert.waitUntilPresentAndClassSet();
-        assertTrue(alert.isDanger());
+        assertTrue("Is not danger; @class=" + alert.getAttributeClass(), alert.isDanger());
         alert.close();
     }