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164 lines (130 loc) · 4.46 KB
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# -*- 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)
from numbers import Integral
from future.tests.base import unittest, skip26
TEST_UNICODE_STR = u'ℝεα∂@ßʟ℮ ☂ℯṧт υηḯ¢☺ḓ℮'
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))
@skip26
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_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')
if __name__ == '__main__':
unittest.main()