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Copy pathtest_simpleeval.py
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127 lines (98 loc) · 4.37 KB
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# -*- coding: utf-8 -*-
import ast
import numbers
from bpython.simpleeval import (simple_eval,
evaluate_current_expression,
EvaluationError)
from bpython.test import unittest
class TestSimpleEval(unittest.TestCase):
def assertMatchesStdlib(self, expr):
self.assertEqual(ast.literal_eval(expr), simple_eval(expr))
def test_matches_stdlib(self):
"""Should match the stdlib literal_eval if no names or indexing"""
self.assertMatchesStdlib("[1]")
self.assertMatchesStdlib("{(1,): [2,3,{}]}")
def test_indexing(self):
"""Literals can be indexed into"""
self.assertEqual(simple_eval('[1,2][0]'), 1)
self.assertEqual(simple_eval('a', {'a': 1}), 1)
def test_name_lookup(self):
"""Names can be lookup up in a namespace"""
self.assertEqual(simple_eval('a', {'a': 1}), 1)
self.assertEqual(simple_eval('map'), map)
self.assertEqual(simple_eval('a[b]', {'a': {'c': 1}, 'b': 'c'}), 1)
def test_allow_name_lookup(self):
"""Names can be lookup up in a namespace"""
self.assertEqual(simple_eval('a', {'a': 1}), 1)
def test_lookup_on_suspicious_types(self):
class FakeDict(object):
pass
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': FakeDict()})
class TrickyDict(dict):
def __getitem__(self, index):
self.fail("doing key lookup isn't safe")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': TrickyDict()})
class SchrodingersDict(dict):
def __getattribute__(inner_self, attr):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': SchrodingersDict()})
class SchrodingersCatsDict(dict):
def __getattr__(inner_self, attr):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': SchrodingersDict()})
def test_operators_on_suspicious_types(self):
class Spam(numbers.Number):
def __add__(inner_self, other):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a + 1', {'a': Spam()})
def test_operators_on_numbers(self):
self.assertEqual(simple_eval('-2'), -2)
self.assertEqual(simple_eval('1 + 1'), 2)
self.assertEqual(simple_eval('a - 2', {'a': 1}), -1)
with self.assertRaises(ValueError):
simple_eval('2 * 3')
with self.assertRaises(ValueError):
simple_eval('2 ** 3')
def test_function_calls_raise(self):
with self.assertRaises(ValueError):
simple_eval('1()')
def test_nonexistant_names_raise(self):
with self.assertRaises(EvaluationError):
simple_eval('a')
class TestEvaluateCurrentExpression(unittest.TestCase):
def assertEvaled(self, line, value, ns=None):
assert line.count('|') == 1
cursor_offset = line.find('|')
line = line.replace('|', '')
self.assertEqual(evaluate_current_expression(cursor_offset, line, ns),
value)
def assertCannotEval(self, line, ns=None):
assert line.count('|') == 1
cursor_offset = line.find('|')
line = line.replace('|', '')
with self.assertRaises(EvaluationError):
evaluate_current_expression(cursor_offset, line, ns)
def test_simple(self):
self.assertEvaled('[1].a|bc', [1])
self.assertEvaled('[1].abc|', [1])
self.assertEvaled('[1].|abc', [1])
self.assertEvaled('[1]. |abc', [1])
self.assertEvaled('[1] .|abc', [1])
self.assertCannotEval('[1].abc |', [1])
self.assertCannotEval('[1]. abc |', [1])
self.assertCannotEval('[2][1].a|bc', [1])
def test_nonsense(self):
self.assertEvaled('!@#$ [1].a|bc', [1])
self.assertEvaled('--- [2][0].a|bc', 2)
self.assertCannotEval('"asdf".centered()[1].a|bc')
self.assertEvaled('"asdf"[1].a|bc', 's')
def test_with_namespace(self):
self.assertEvaled('a[1].a|bc', 'd', {'a': 'adsf'})
self.assertCannotEval('a[1].a|bc', {})
if __name__ == '__main__':
unittest.main()