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test_simpleeval.py
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importast
importnumbers
importsys
frombpython.simpleevalimport (
simple_eval,
evaluate_current_expression,
EvaluationError,
)
frombpython.testimportunittest
classTestSimpleEval(unittest.TestCase):
defassertMatchesStdlib(self,expr):
self.assertEqual(ast.literal_eval(expr),simple_eval(expr))
deftest_matches_stdlib(self):
"""Should match the stdlib literal_eval if no names or indexing"""
self.assertMatchesStdlib("[1]")
self.assertMatchesStdlib("{(1,): [2,3,{}]}")
self.assertMatchesStdlib("{1, 2}")
@unittest.skipUnless(
sys.version_info[:2]>= (3,9),"Only Python3.9 evaluates set()"
)
deftest_matches_stdlib_set_literal(self):
"""set() is evaluated"""
self.assertMatchesStdlib("set()")
deftest_indexing(self):
"""Literals can be indexed into"""
self.assertEqual(simple_eval("[1,2][0]"),1)
deftest_name_lookup(self):
"""Names can be looked up in a namespace"""
self.assertEqual(simple_eval("a", {"a":1}),1)
self.assertEqual(simple_eval("map"),map)
deftest_name_lookup_indexing(self):
"""Names can be looked up in a namespace"""
self.assertEqual(simple_eval("a[b]", {"a": {"c":1},"b":"c"}),1)
deftest_lookup_on_suspicious_types(self):
classFakeDict:
pass
withself.assertRaises(ValueError):
simple_eval("a[1]", {"a":FakeDict()})
classTrickyDict(dict):
def__getitem__(self,index):
self.fail("doing key lookup isn't safe")
withself.assertRaises(ValueError):
simple_eval("a[1]", {"a":TrickyDict()})
classSchrodingersDict(dict):
def__getattribute__(inner_self,attr):
self.fail("doing attribute lookup might have side effects")
withself.assertRaises(ValueError):
simple_eval("a[1]", {"a":SchrodingersDict()})
classSchrodingersCatsDict(dict):
def__getattr__(inner_self,attr):
self.fail("doing attribute lookup might have side effects")
withself.assertRaises(ValueError):
simple_eval("a[1]", {"a":SchrodingersDict()})
deftest_operators_on_suspicious_types(self):
classSpam(numbers.Number):
def__add__(inner_self,other):
self.fail("doing attribute lookup might have side effects")
withself.assertRaises(ValueError):
simple_eval("a + 1", {"a":Spam()})
deftest_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)
withself.assertRaises(ValueError):
simple_eval("2 * 3")
withself.assertRaises(ValueError):
simple_eval("2 ** 3")
deftest_function_calls_raise(self):
withself.assertRaises(ValueError):
simple_eval("1()")
deftest_nonexistant_names_raise(self):
withself.assertRaises(EvaluationError):
simple_eval("a")
deftest_attribute_access(self):
classFoo:
abc=1
self.assertEqual(simple_eval("foo.abc", {"foo":Foo()}),1)
classTestEvaluateCurrentExpression(unittest.TestCase):
defassertEvaled(self,line,value,ns=None):
assertline.count("|")==1
cursor_offset=line.find("|")
line=line.replace("|","")
self.assertEqual(
evaluate_current_expression(cursor_offset,line,ns),value
)
defassertCannotEval(self,line,ns=None):
assertline.count("|")==1
cursor_offset=line.find("|")
line=line.replace("|","")
withself.assertRaises(EvaluationError):
evaluate_current_expression(cursor_offset,line,ns)
deftest_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])
deftest_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")
deftest_with_namespace(self):
self.assertEvaled("a[1].a|bc","d", {"a":"adsf"})
self.assertCannotEval("a[1].a|bc", {})
if__name__=="__main__":
unittest.main()