@Test
public void testCopyContext() throws Exception {

    Map<String, Object> context1 = new HashMap<>();
    Map<String, Object> context2 = new HashMap<>();
    String keys = "a,b";
    context1.put("a", 15);
    context1.put("b", 16);
    Misc.copyContext(keys, context1, context2);
    assertTrue(context1.equals(context2));
}