@Test
public void testKeysToParamString(){

	MultiValueMap<String, Object> params = new LinkedMultiValueMap<String, Object>();
	params.add("param1", "value1");
	params.add("param1", "value1-2");
	params.set("param2", "value2");
	params.set("param3", 3);
	String result = RestUtils.keysToParamString(params);
	System.out.println("result:"+result);
	assertThat(result).isEqualTo("param1={param1}&param1={param1}&param2={param2}&param3={param3}");
}