@Test // single level, just put the key/value in the top level map
public void putByPath_path_single_level() {

	Map<String,Object> input = new HashMap<String,Object>();
	Map<String,Object> expect = new HashMap<String,Object>() {{
		put("a", "value");
	}};
	CollectionUtils.putByPath(input, "a", "value");
	assertEquals(expect, input);
}