### Question:
CustomMappingParserFactory { public static CustomMappingParser parser() { return new CustomMappingParserImpl(new Lexer()) ; } CustomMappingParserFactory(); static CustomMappingParser parser();  }### Answer:
@Test void parser() { CustomMappingParserFactory x = new CustomMappingParserFactory(); assertEquals(x,x); }
@Test void checknewInstance() { CustomMappingParser x1 = CustomMappingParserFactory.parser(); CustomMappingParser x2 = CustomMappingParserFactory.parser(); assertNotEquals(x1,x2); }