python-future/tests/test_future/test_utils.py at develop · CodeShane/python-future · GitHub

History

319 lines (264 loc) · 9.07 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

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

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

"""

Tests for the various utility functions and classes in ``future.utils``

"""

from __future__ import absolute_import, unicode_literals, print_function

import sys

from future.builtins import *

from future.utils import (old_div, istext, isbytes, native, PY2, PY3,

native_str, raise_, as_native_str, ensure_new_type,

bytes_to_native_str, raise_from)

from future.tests.base import expectedFailurePY3

from numbers import Integral

from future.tests.base import unittest, skip26

TEST_UNICODE_STR = u'ℝεα∂@ßʟ℮ ☂ℯṧт υηḯ¢☺ḓ℮'

class MyExceptionIssue235(Exception):

def __init__(self, a, b):

super(MyExceptionIssue235, self).__init__('{0}: {1}'.format(a, b))

class TestUtils(unittest.TestCase):

def setUp(self):

self.s = TEST_UNICODE_STR

self.s2 = str(self.s)

self.b = b'ABCDEFG'

self.b2 = bytes(self.b)

def test_old_div(self):

"""

Tests whether old_div(a, b) is always equal to Python 2's a / b.

"""

self.assertEqual(old_div(1, 2), 0)

self.assertEqual(old_div(2, 2), 1)

self.assertTrue(isinstance(old_div(2, 2), int))

self.assertEqual(old_div(3, 2), 1)

self.assertTrue(isinstance(old_div(3, 2), int))

self.assertEqual(old_div(3., 2), 1.5)

self.assertTrue(not isinstance(old_div(3., 2), int))

self.assertEqual(old_div(-1, 2.), -0.5)

self.assertTrue(not isinstance(old_div(-1, 2.), int))

with self.assertRaises(ZeroDivisionError):

old_div(0, 0)

with self.assertRaises(ZeroDivisionError):

old_div(1, 0)

def test_native_str(self):

"""

Tests whether native_str is really equal to the platform str.

"""

if PY2:

import __builtin__

builtin_str = __builtin__.str

else:

import builtins

builtin_str = builtins.str

inputs = [b'blah', u'blah', 'blah']

for s in inputs:

self.assertEqual(native_str(s), builtin_str(s))

self.assertTrue(isinstance(native_str(s), builtin_str))

def test_native(self):

a = int(10**20) # long int

b = native(a)

self.assertEqual(a, b)

if PY2:

self.assertEqual(type(b), long)

else:

self.assertEqual(type(b), int)

c = bytes(b'ABC')

d = native(c)

self.assertEqual(c, d)

if PY2:

self.assertEqual(type(d), type(b'Py2 byte-string'))

else:

self.assertEqual(type(d), bytes)

s = str(u'ABC')

t = native(s)

self.assertEqual(s, t)

if PY2:

self.assertEqual(type(t), unicode)

else:

self.assertEqual(type(t), str)

d1 = dict({'a': 1, 'b': 2})

d2 = native(d1)

self.assertEqual(d1, d2)

self.assertEqual(type(d2), type({}))

def test_istext(self):

self.assertTrue(istext(self.s))

self.assertTrue(istext(self.s2))

self.assertFalse(istext(self.b))

self.assertFalse(istext(self.b2))

def test_isbytes(self):

self.assertTrue(isbytes(self.b))

self.assertTrue(isbytes(self.b2))

self.assertFalse(isbytes(self.s))

self.assertFalse(isbytes(self.s2))

@unittest.skipIf(PY3, 'test_raise_ currently fails on Py3')

def test_raise_(self):

"""

The with_value() test currently fails on Py3

"""

def valerror():

try:

raise ValueError("Apples!")

except Exception as e:

raise_(e)

self.assertRaises(ValueError, valerror)

def with_value():

raise_(IOError, "This is an error")

self.assertRaises(IOError, with_value)

try:

with_value()

except IOError as e:

self.assertEqual(str(e), "This is an error")

def with_traceback():

try:

raise ValueError("An error")

except Exception as e:

_, _, traceback = sys.exc_info()

raise_(IOError, str(e), traceback)

self.assertRaises(IOError, with_traceback)

try:

with_traceback()

except IOError as e:

self.assertEqual(str(e), "An error")

def test_raise_from_None(self):

try:

raise TypeError("foo")

except:

raise_from(ValueError(), None)

except ValueError as e:

self.assertTrue(isinstance(e.__context__, TypeError))

self.assertIsNone(e.__cause__)

def test_issue_235(self):

def foo():

raise MyExceptionIssue235(3, 7)

def bar():

try:

foo()

except Exception as err:

raise_from(ValueError('blue'), err)

try:

bar()

except ValueError as e:

pass

# incorrectly raises a TypeError on Py3 as of v0.15.2.

@skip26

def test_as_native_str(self):

"""

Tests the decorator as_native_str()

"""

class MyClass(object):

@as_native_str()

def __repr__(self):

return u'abc'

obj = MyClass()

self.assertEqual(repr(obj), 'abc')

if PY2:

self.assertEqual(repr(obj), b'abc')

else:

self.assertEqual(repr(obj), u'abc')

def test_ensure_new_type(self):

s = u'abcd'

s2 = str(s)

self.assertEqual(ensure_new_type(s), s2)

self.assertEqual(type(ensure_new_type(s)), str)

b = b'xyz'

b2 = bytes(b)

self.assertEqual(ensure_new_type(b), b2)

self.assertEqual(type(ensure_new_type(b)), bytes)

i = 10000000000000

i2 = int(i)

self.assertEqual(ensure_new_type(i), i2)

self.assertEqual(type(ensure_new_type(i)), int)

l = []

self.assertIs(ensure_new_type(l), l)

def test_bytes_to_native_str(self):

"""

Test for issue #47

"""

b = bytes(b'abc')

s = bytes_to_native_str(b)

if PY2:

self.assertEqual(s, b)

else:

self.assertEqual(s, 'abc')

self.assertTrue(isinstance(s, native_str))

self.assertEqual(type(s), native_str)

class TestCause(unittest.TestCase):

"""

Except for the first method, these were adapted from Py3.3's

Lib/test/test_raise.py.

"""

def test_normal_use(self):

"""

Adapted from PEP 3134 docs

"""

# Setup:

class DatabaseError(Exception):

pass

# Python 2 and 3:

from future.utils import raise_from

class FileDatabase:

def __init__(self, filename):

try:

self.file = open(filename)

except IOError as exc:

raise_from(DatabaseError('failed to open'), exc)

# Testing the above:

try:

fd = FileDatabase('non_existent_file.txt')

except Exception as e:

assert isinstance(e.__cause__, IOError) # FileNotFoundError on

# Py3.3+ inherits from IOError

def testCauseSyntax(self):

try:

raise TypeError

except Exception:

raise_from(ValueError, None)

except ValueError as exc:

self.assertIsNone(exc.__cause__)

self.assertTrue(exc.__suppress_context__)

exc.__suppress_context__ = False

raise exc

except ValueError as exc:

e = exc

self.assertIsNone(e.__cause__)

self.assertFalse(e.__suppress_context__)

self.assertIsInstance(e.__context__, TypeError)

def test_invalid_cause(self):

try:

raise_from(IndexError, 5)

except TypeError as e:

self.assertIn("exception cause", str(e))

else:

self.fail("No exception raised")

def test_class_cause(self):

try:

raise_from(IndexError, KeyError)

except IndexError as e:

self.assertIsInstance(e.__cause__, KeyError)

else:

self.fail("No exception raised")

def test_instance_cause(self):

cause = KeyError('blah')

try:

raise_from(IndexError, cause)

except IndexError as e:

# FAILS:

self.assertTrue(e.__cause__ is cause)

# Even this weaker version seems to fail, although repr(cause) looks correct.

# Is there something strange about testing exceptions for equality?

self.assertEqual(e.__cause__, cause)

else:

self.fail("No exception raised")

def test_erroneous_cause(self):

class MyException(Exception):

def __init__(self):

raise RuntimeError()

try:

raise_from(IndexError, MyException)

except RuntimeError:

pass

else:

self.fail("No exception raised")

if __name__ == '__main__':

unittest.main()

python-future/tests/test_future/test_utils.py at develop · CodeShane/python-future · GitHub

Expand file tree

Breadcrumbs

test_utils.py

Latest commit

History

Breadcrumbs

test_utils.py

File metadata and controls