### Question:
ObjectUtil { public Map<String, String> getThreadContextMap(ThreadLocal<Map<String, String>> threadConfigurationContext) { Map<String, String> aMap = threadConfigurationContext.get(); if (aMap == null) { aMap = new HashMap<>(); threadConfigurationContext.set(aMap); } return aMap; }  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 testSetApiMlContextMap_Ok() { Map map = ObjectUtil.getThreadContextMap(threadContext); assertNotNull(map); map.put("test.property", "test.value"); map = ObjectUtil.getThreadContextMap(threadContext); assertEquals("test.value", map.get("test.property")); }