### Question:
ObjectUtil { public static void requireNotNull(Object param, String message) { if (param == null) { throw new IllegalArgumentException(message); } }  static void requireNotNull(Object param, String message); static void requireNotEmpty(String param, String message); Map<String, String> getThreadContextMap(ThreadLocal<Map<String, String>> threadConfigurationContext); Map<String, Object> mergeConfigurations(Map<String, Object> firstMap, Map<String, Object> secondMap); static String getMethodIdentifier(Method method);  }### Answer:
@Test public void testRequireNotNull() { exception.expect(IllegalArgumentException.class); exception.expectMessage("Parameter can't be null"); ObjectUtil.requireNotNull(null, "Parameter can't be null"); }