### Question:
EnvironmentUpdateUtils { public static void put(String key, String value){ Map<String, String> environment = new HashMap<String, String>(System.getenv()); environment.put(key, value); updateEnvironment(environment); }  static void put(String key, String value); static void putAll(Map<String, String> additionalEnvironment);  }### Answer:
@Test public void testMultipleUpdateEnvironment() { EnvironmentUpdateUtils.put("test.environment1", "test.value1"); EnvironmentUpdateUtils.put("test.environment2", "test.value2"); assertEquals("Environment was not set propertly", "test.value1", System.getenv("test.environment1")); assertEquals("Environment was not set propertly", "test.value2", System.getenv("test.environment2")); }