def test_eval_lt_false_2():
assert evaluate(parse('(< 3 2)')) == 0
def test_eval_div():
assert evaluate(parse('(/ 6 2)')) == 3
def test_eval_div_by_zero():
with raises(ZeroDivisionError):
evaluate(parse('(/ 6 0)'))
def test_eval_numexp_inner():
assert evaluate(parse('(+ 2 (* 3 4))')) == 14
def test_eval_no_operator_detail():
with raises(InvalidOperator) as excinfo:
evaluate(parse('(2 3)'))
assert str(excinfo.value) == 'invalid operator: 2'
def test_parse_plus_one():
assert parse('(++ 2)') == ['++', 2]
def test_eval_op():
import operator
assert evaluate(parse('+')) == operator.add
def test_parse_number():
assert parse('3') == 3
def test_parse_negative_number():
assert parse('-3') == -3
def test_eval_too_few_args():
with raises(MissingArguments):
evaluate(parse('(* 1)'))
def test_eval_too_many_args():
with raises(TooManyArguments):
evaluate(parse('(* 1 2 3)'))
def test_plus_number():
with raises(InvalidOperator):
evaluate(parse('+1'))
def test_eval_gt_false_2():
assert evaluate(parse('(> 3 4)')) == 0
def test_eval_gt_true():
assert evaluate(parse('(> 4 3)')) == 1
def test_parse_open_paren():
with raises(UnexpectedEndOfInput):
parse('(')
def test_parse_symbol():
assert parse('+') == '+'
def test_parse_right_paren_detail():
with raises(UnexpectedRightParen) as excinfo:
parse(')')
assert str(excinfo.value) == 'unexpected )'
def test_parse_plus_number_as_symbol():
assert parse('+1') == '+1'
def test_eval_int():
assert evaluate(parse('3')) == 3
def test_parse_numexp():
assert parse('(+ 2 3)') == ['+', 2, 3]
def test_eval_numexp():
assert evaluate(parse('(+ 2 3)')) == 5
def test_parse_numexp_inner():
assert parse('(+ 2 (* 3 4))') == ['+', 2, ['*', 3, 4]]
def test_eval_no_operator2():
with raises(InvalidOperator):
evaluate(parse('(2 3)'))
def test_parse_empty_paren():
assert parse('()') == []
def test_eval_sub():
assert evaluate(parse('(- 2 3)')) == -1
def test_parse_empty():
with raises(UnexpectedEndOfInput):
parse('')
def test_eval_div_returns_int():
assert evaluate(parse('(/ 6 4)')) == 1
def test_parse_right_paren():
with raises(UnexpectedRightParen):
parse(')')
def test_eval_eq_true():
assert evaluate(parse('(= 2 2)')) == 1
def test_eval_lt_true():
assert evaluate(parse('(< 2 3)')) == 1
