bpython/bpython/test/test_simpleeval.py at master · pp1992m/bpython · GitHub

History

252 lines (193 loc) · 8.18 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

# -*- coding: utf-8 -*-

import ast

import numbers

from bpython.simpleeval import (simple_eval,

evaluate_current_expression,

EvaluationError,

safe_get_attribute,

safe_get_attribute_new_style)

from bpython.test import unittest

from bpython._py3compat import py3

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')

def test_attribute_access(self):

class Foo(object):

abc = 1

self.assertEqual(simple_eval('foo.abc', {'foo': Foo()}), 1)

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', {})

class A(object):

a = 'a'

class B(A):

b = 'b'

class Property(object):

@property

def prop(self):

raise AssertionError('Property __get__ executed')

class Slots(object):

__slots__ = ['s1', 's2', 's3']

if not py3:

@property

def s3(self):

raise AssertionError('Property __get__ executed')

class SlotsSubclass(Slots):

@property

def s4(self):

raise AssertionError('Property __get__ executed')

class OverriddenGetattr(object):

def __getattr__(self, attr):

raise AssertionError('custom __getattr__ executed')

a = 1

class OverriddenGetattribute(object):

def __getattribute__(self, attr):

raise AssertionError('custom __getattribute__ executed')

a = 1

class OverriddenMRO(object):

def __mro__(self):

raise AssertionError('custom mro executed')

a = 1

member_descriptor = type(Slots.s1)

class TestSafeGetAttribute(unittest.TestCase):

def test_lookup_on_object(self):

a = A()

a.x = 1

self.assertEqual(safe_get_attribute_new_style(a, 'x'), 1)

self.assertEqual(safe_get_attribute_new_style(a, 'a'), 'a')

b = B()

b.y = 2

self.assertEqual(safe_get_attribute_new_style(b, 'y'), 2)

self.assertEqual(safe_get_attribute_new_style(b, 'a'), 'a')

self.assertEqual(safe_get_attribute_new_style(b, 'b'), 'b')

def test_avoid_running_properties(self):

p = Property()

self.assertEqual(safe_get_attribute_new_style(p, 'prop'),

Property.prop)

@unittest.skipIf(py3, 'Old-style classes not in Python 3')

def test_raises_on_old_style_class(self):

class Old:

pass

with self.assertRaises(ValueError):

safe_get_attribute_new_style(Old, 'asdf')

def test_lookup_with_slots(self):

s = Slots()

s.s1 = 's1'

self.assertEqual(safe_get_attribute(s, 's1'), 's1')

self.assertIsInstance(safe_get_attribute_new_style(s, 's1'),

member_descriptor)

with self.assertRaises(AttributeError):

safe_get_attribute(s, 's2')

self.assertIsInstance(safe_get_attribute_new_style(s, 's2'),

member_descriptor)

def test_lookup_on_slots_classes(self):

sga = safe_get_attribute

s = SlotsSubclass()

self.assertIsInstance(sga(Slots, 's1'), member_descriptor)

self.assertIsInstance(sga(SlotsSubclass, 's1'), member_descriptor)

self.assertIsInstance(sga(SlotsSubclass, 's4'), property)

self.assertIsInstance(sga(s, 's4'), property)

@unittest.skipIf(py3, "Py 3 doesn't allow slots and prop in same class")

def test_lookup_with_property_and_slots(self):

sga = safe_get_attribute

s = SlotsSubclass()

self.assertIsInstance(sga(Slots, 's3'), property)

self.assertEqual(safe_get_attribute(s, 's3'),

Slots.__dict__['s3'])

self.assertIsInstance(sga(SlotsSubclass, 's3'), property)

def test_lookup_on_overridden_methods(self):

sga = safe_get_attribute

self.assertEqual(sga(OverriddenGetattr(), 'a'), 1)

self.assertEqual(sga(OverriddenGetattribute(), 'a'), 1)

self.assertEqual(sga(OverriddenMRO(), 'a'), 1)

with self.assertRaises(AttributeError):

sga(OverriddenGetattr(), 'b')

with self.assertRaises(AttributeError):

sga(OverriddenGetattribute(), 'b')

with self.assertRaises(AttributeError):

sga(OverriddenMRO(), 'b')

if __name__ == '__main__':

unittest.main()

bpython/bpython/test/test_simpleeval.py at master · pp1992m/bpython · GitHub

Expand file tree

Breadcrumbs

test_simpleeval.py

Latest commit

History

Breadcrumbs

test_simpleeval.py

File metadata and controls