def test_call_expression():
eq_(evaluate('the_answer() - 42',
{'the_answer': lambda: 42}),
0)
eq_(evaluate('2 * (1 + mod(x, 3))',
{
'x': 5,
'mod': lambda x, y: x % y,
}),
6)
def test_bound_variable():
eq_(evaluate('a + 1', {'a': -1}), 0)
def test_basic():
eq_(evaluate('A + B * 2.0', {'A': 1.0, 'B': 3.1}), 7.2)
def test_unbound_variable():
evaluate('2 * b + 3', {'a': 0.5})