def test_begin(self):
set_var = e.eval([
p._begin, [p._define, p.Symbol('x'), 3],
[p._set, p.Symbol('x'), 5], [p.Symbol('+'),
p.Symbol('x'), 1]
])
assert set_var == 6
def test_lambda(self):
lambda_list = [
p._lambda,
p.Symbol('x'), [p.Symbol('+'),
p.Symbol('x'),
p.Symbol('x')]
]
lambda_func = e.eval(lambda_list)
assert type(lambda_func) == type(e.Procedure('blah', 'blah', 'blah'))
assert lambda_func(3) == 6
def test_to_string():
assert u.to_string(True) == '#t'
assert u.to_string(False) == '#f'
assert u.to_string(p.Symbol('x')) == 'x'
assert u.to_string([1, 2, 3, 4]) == '(1 2 3 4)'
assert u.to_string(complex(4, -3)) == '(4-3i)'
def test_set(self):
e.eval([p._set, p.Symbol('x'), 3])
assert e.eval(p.Symbol('x')) == 3
def test_define(self):
e.eval([p._define, p.Symbol('x'), 3])
assert e.eval(p.Symbol('x')) == 3
def test_if(self):
true_if_statement = [p._if, [p.Symbol('='), 1, 1], 5, 'blah']
false_if_statement = [p._if, [p.Symbol('='), 1, 2], 5, 'blah']
assert e.eval(true_if_statement) == 5
assert e.eval(false_if_statement) == 'blah'