diff a/test/jdk/java/lang/IdentityExceptionBasicTest.java b/test/jdk/java/lang/IdentityExceptionBasicTest.java
--- /dev/null
+++ b/test/jdk/java/lang/IdentityExceptionBasicTest.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/*
+ * @test
+ * @summary Basic tests for java.lang.IdentityException
+ * @enablePreview
+ * @run junit ${test.main.class}
+ */
+class IdentityExceptionBasicTest {
+
+    /*
+     * Verify the no-arg constructor
+     */
+    @Test
+    void testNoArg() throws Exception {
+        // verify that there's no exception message and no cause
+        final IdentityException ex = new IdentityException();
+        assertNull(ex.getMessage(), "unexpected exception message");
+        assertNull(ex.getCause(), "unexpected cause");
+    }
+
+    /*
+     * Verify the constructor which takes the String arg
+     */
+    @Test
+    void testStringArg() throws Exception {
+        // verify that null is allowed
+        final IdentityException ex = new IdentityException((String) null);
+        assertNull(ex.getMessage(), "unexpected exception message");
+        assertNull(ex.getCause(), "unexpected cause");
+
+        // verify custom exception message
+        final IdentityException ex2 = new IdentityException("hello world");
+        assertEquals("hello world", ex2.getMessage(), "unexpected exception message");
+        assertNull(ex2.getCause(), "unexpected cause");
+    }
+}