@Test
public void testToString() {

	//arrage
	@SuppressWarnings("unchecked")
	List<String> listMock = mock(List.class);
	
	//assert
	assertNotNull(sut.toString(null));
	assertNotNull(sut.toString(new Long(10)));
	assertNotNull(sut.toString(new Boolean(true)));
	assertNotNull(sut.toString(new Double(2)));
	assertNotNull(sut.toString(new Integer(2)));
	assertNotNull(sut.toString(listMock));
	
}