@Test public void testEnv() { final SystemProperties props = new SystemProperties(); assertNull(props.getEnv("MY_ENV")); assertNull(props.putEnv("MY_ENV", "myvalue")); assertEquals("myvalue", props.getEnv("MY_ENV")); assertEquals("myvalue", props.putEnv("MY_ENV", "othervalue")); assertEquals("othervalue", props.getEnv("MY_ENV")); assertEquals("othervalue", props.get("env.MY_ENV")); }