Add test cases to test suite 'positive':
- op_ex_mod_int:
	Example of integer a modulo
- overload_operator1:
	operator overloading with override

Add test cases to test suite 'negative':
- bin_op_ambiguous_error1:
	Ambiguous binary operator
- bin_op_ambiguous_error2:
	Check the return type of binary operator at TypeCheck
- bin_op_not_found_error1:
	Binary operator not found
- print_not_found_error1
	Print function not found
- unary_op_not_found_error1
	Unary operator not found