Current File : //lib/python3/dist-packages/twisted/test/test_compat.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.python.compat}.
"""
import codecs
import io
import sys
import traceback
from unittest import skipIf
from twisted.python.compat import (
_PYPY,
_get_async_param,
bytesEnviron,
cmp,
comparable,
execfile,
intToBytes,
ioType,
iterbytes,
lazyByteSlice,
nativeString,
networkString,
reraise,
)
from twisted.python.filepath import FilePath
from twisted.python.runtime import platform
from twisted.trial.unittest import SynchronousTestCase, TestCase
class IOTypeTests(SynchronousTestCase):
"""
Test cases for determining a file-like object's type.
"""
def test_3StringIO(self):
"""
An L{io.StringIO} accepts and returns text.
"""
self.assertEqual(ioType(io.StringIO()), str)
def test_3BytesIO(self):
"""
An L{io.BytesIO} accepts and returns bytes.
"""
self.assertEqual(ioType(io.BytesIO()), bytes)
def test_3openTextMode(self):
"""
A file opened via 'io.open' in text mode accepts and returns text.
"""
with open(self.mktemp(), "w") as f:
self.assertEqual(ioType(f), str)
def test_3openBinaryMode(self):
"""
A file opened via 'io.open' in binary mode accepts and returns bytes.
"""
with open(self.mktemp(), "wb") as f:
self.assertEqual(ioType(f), bytes)
def test_codecsOpenBytes(self):
"""
The L{codecs} module, oddly, returns a file-like object which returns
bytes when not passed an 'encoding' argument.
"""
with codecs.open(self.mktemp(), "wb") as f:
self.assertEqual(ioType(f), bytes)
def test_codecsOpenText(self):
"""
When passed an encoding, however, the L{codecs} module returns unicode.
"""
with codecs.open(self.mktemp(), "wb", encoding="utf-8") as f:
self.assertEqual(ioType(f), str)
def test_defaultToText(self):
"""
When passed an object about which no sensible decision can be made, err
on the side of unicode.
"""
self.assertEqual(ioType(object()), str)
class CompatTests(SynchronousTestCase):
"""
Various utility functions in C{twisted.python.compat} provide same
functionality as modern Python variants.
"""
def test_set(self):
"""
L{set} should behave like the expected set interface.
"""
a = set()
a.add("b")
a.add("c")
a.add("a")
b = list(a)
b.sort()
self.assertEqual(b, ["a", "b", "c"])
a.remove("b")
b = list(a)
b.sort()
self.assertEqual(b, ["a", "c"])
a.discard("d")
b = {"r", "s"}
d = a.union(b)
b = list(d)
b.sort()
self.assertEqual(b, ["a", "c", "r", "s"])
def test_frozenset(self):
"""
L{frozenset} should behave like the expected frozenset interface.
"""
a = frozenset(["a", "b"])
self.assertRaises(AttributeError, getattr, a, "add")
self.assertEqual(sorted(a), ["a", "b"])
b = frozenset(["r", "s"])
d = a.union(b)
b = list(d)
b.sort()
self.assertEqual(b, ["a", "b", "r", "s"])
class ExecfileCompatTests(SynchronousTestCase):
"""
Tests for the Python 3-friendly L{execfile} implementation.
"""
def writeScript(self, content):
"""
Write L{content} to a new temporary file, returning the L{FilePath}
for the new file.
"""
path = self.mktemp()
with open(path, "wb") as f:
f.write(content.encode("ascii"))
return FilePath(path.encode("utf-8"))
def test_execfileGlobals(self):
"""
L{execfile} executes the specified file in the given global namespace.
"""
script = self.writeScript("foo += 1\n")
globalNamespace = {"foo": 1}
execfile(script.path, globalNamespace)
self.assertEqual(2, globalNamespace["foo"])
def test_execfileGlobalsAndLocals(self):
"""
L{execfile} executes the specified file in the given global and local
namespaces.
"""
script = self.writeScript("foo += 1\n")
globalNamespace = {"foo": 10}
localNamespace = {"foo": 20}
execfile(script.path, globalNamespace, localNamespace)
self.assertEqual(10, globalNamespace["foo"])
self.assertEqual(21, localNamespace["foo"])
def test_execfileUniversalNewlines(self):
"""
L{execfile} reads in the specified file using universal newlines so
that scripts written on one platform will work on another.
"""
for lineEnding in "\n", "\r", "\r\n":
script = self.writeScript("foo = 'okay'" + lineEnding)
globalNamespace = {"foo": None}
execfile(script.path, globalNamespace)
self.assertEqual("okay", globalNamespace["foo"])
class PYPYTest(SynchronousTestCase):
"""
Identification of PyPy.
"""
def test_PYPY(self):
"""
On PyPy, L{_PYPY} is True.
"""
if "PyPy" in sys.version:
self.assertTrue(_PYPY)
else:
self.assertFalse(_PYPY)
@comparable
class Comparable:
"""
Objects that can be compared to each other, but not others.
"""
def __init__(self, value):
self.value = value
def __cmp__(self, other):
if not isinstance(other, Comparable):
return NotImplemented
return cmp(self.value, other.value)
class ComparableTests(SynchronousTestCase):
"""
L{comparable} decorated classes emulate Python 2's C{__cmp__} semantics.
"""
def test_equality(self):
"""
Instances of a class that is decorated by C{comparable} support
equality comparisons.
"""
# Make explicitly sure we're using ==:
self.assertTrue(Comparable(1) == Comparable(1))
self.assertFalse(Comparable(2) == Comparable(1))
def test_nonEquality(self):
"""
Instances of a class that is decorated by C{comparable} support
inequality comparisons.
"""
# Make explicitly sure we're using !=:
self.assertFalse(Comparable(1) != Comparable(1))
self.assertTrue(Comparable(2) != Comparable(1))
def test_greaterThan(self):
"""
Instances of a class that is decorated by C{comparable} support
greater-than comparisons.
"""
self.assertTrue(Comparable(2) > Comparable(1))
self.assertFalse(Comparable(0) > Comparable(3))
def test_greaterThanOrEqual(self):
"""
Instances of a class that is decorated by C{comparable} support
greater-than-or-equal comparisons.
"""
self.assertTrue(Comparable(1) >= Comparable(1))
self.assertTrue(Comparable(2) >= Comparable(1))
self.assertFalse(Comparable(0) >= Comparable(3))
def test_lessThan(self):
"""
Instances of a class that is decorated by C{comparable} support
less-than comparisons.
"""
self.assertTrue(Comparable(0) < Comparable(3))
self.assertFalse(Comparable(2) < Comparable(0))
def test_lessThanOrEqual(self):
"""
Instances of a class that is decorated by C{comparable} support
less-than-or-equal comparisons.
"""
self.assertTrue(Comparable(3) <= Comparable(3))
self.assertTrue(Comparable(0) <= Comparable(3))
self.assertFalse(Comparable(2) <= Comparable(0))
class Python3ComparableTests(SynchronousTestCase):
"""
Python 3-specific functionality of C{comparable}.
"""
def test_notImplementedEquals(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__eq__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__eq__(object()), NotImplemented)
def test_notImplementedNotEquals(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__ne__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__ne__(object()), NotImplemented)
def test_notImplementedGreaterThan(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__gt__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__gt__(object()), NotImplemented)
def test_notImplementedLessThan(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__lt__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__lt__(object()), NotImplemented)
def test_notImplementedGreaterThanEquals(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__ge__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__ge__(object()), NotImplemented)
def test_notImplementedLessThanEquals(self):
"""
Instances of a class that is decorated by C{comparable} support
returning C{NotImplemented} from C{__le__} if it is returned by the
underlying C{__cmp__} call.
"""
self.assertEqual(Comparable(1).__le__(object()), NotImplemented)
class CmpTests(SynchronousTestCase):
"""
L{cmp} should behave like the built-in Python 2 C{cmp}.
"""
def test_equals(self):
"""
L{cmp} returns 0 for equal objects.
"""
self.assertEqual(cmp("a", "a"), 0)
self.assertEqual(cmp(1, 1), 0)
self.assertEqual(cmp([1], [1]), 0)
def test_greaterThan(self):
"""
L{cmp} returns 1 if its first argument is bigger than its second.
"""
self.assertEqual(cmp(4, 0), 1)
self.assertEqual(cmp(b"z", b"a"), 1)
def test_lessThan(self):
"""
L{cmp} returns -1 if its first argument is smaller than its second.
"""
self.assertEqual(cmp(0.1, 2.3), -1)
self.assertEqual(cmp(b"a", b"d"), -1)
class StringTests(SynchronousTestCase):
"""
Compatibility functions and types for strings.
"""
def assertNativeString(self, original, expected):
"""
Raise an exception indicating a failed test if the output of
C{nativeString(original)} is unequal to the expected string, or is not
a native string.
"""
self.assertEqual(nativeString(original), expected)
self.assertIsInstance(nativeString(original), str)
def test_nonASCIIBytesToString(self):
"""
C{nativeString} raises a C{UnicodeError} if input bytes are not ASCII
decodable.
"""
self.assertRaises(UnicodeError, nativeString, b"\xFF")
def test_nonASCIIUnicodeToString(self):
"""
C{nativeString} raises a C{UnicodeError} if input Unicode is not ASCII
encodable.
"""
self.assertRaises(UnicodeError, nativeString, "\u1234")
def test_bytesToString(self):
"""
C{nativeString} converts bytes to the native string format, assuming
an ASCII encoding if applicable.
"""
self.assertNativeString(b"hello", "hello")
def test_unicodeToString(self):
"""
C{nativeString} converts unicode to the native string format, assuming
an ASCII encoding if applicable.
"""
self.assertNativeString("Good day", "Good day")
def test_stringToString(self):
"""
C{nativeString} leaves native strings as native strings.
"""
self.assertNativeString("Hello!", "Hello!")
def test_unexpectedType(self):
"""
C{nativeString} raises a C{TypeError} if given an object that is not a
string of some sort.
"""
self.assertRaises(TypeError, nativeString, 1)
class NetworkStringTests(SynchronousTestCase):
"""
Tests for L{networkString}.
"""
def test_str(self):
"""
L{networkString} returns a C{unicode} object passed to it encoded into
a C{bytes} instance.
"""
self.assertEqual(b"foo", networkString("foo"))
def test_unicodeOutOfRange(self):
"""
L{networkString} raises L{UnicodeError} if passed a C{unicode} instance
containing characters not encodable in ASCII.
"""
self.assertRaises(UnicodeError, networkString, "\N{SNOWMAN}")
def test_nonString(self):
"""
L{networkString} raises L{TypeError} if passed a non-string object or
the wrong type of string object.
"""
self.assertRaises(TypeError, networkString, object())
self.assertRaises(TypeError, networkString, b"bytes")
class ReraiseTests(SynchronousTestCase):
"""
L{reraise} re-raises exceptions on both Python 2 and Python 3.
"""
def test_reraiseWithNone(self):
"""
Calling L{reraise} with an exception instance and a traceback of
L{None} re-raises it with a new traceback.
"""
try:
1 / 0
except BaseException:
typ, value, tb = sys.exc_info()
try:
reraise(value, None)
except BaseException:
typ2, value2, tb2 = sys.exc_info()
self.assertEqual(typ2, ZeroDivisionError)
self.assertIs(value, value2)
self.assertNotEqual(
traceback.format_tb(tb)[-1], traceback.format_tb(tb2)[-1]
)
else:
self.fail("The exception was not raised.")
def test_reraiseWithTraceback(self):
"""
Calling L{reraise} with an exception instance and a traceback
re-raises the exception with the given traceback.
"""
try:
1 / 0
except BaseException:
typ, value, tb = sys.exc_info()
try:
reraise(value, tb)
except BaseException:
typ2, value2, tb2 = sys.exc_info()
self.assertEqual(typ2, ZeroDivisionError)
self.assertIs(value, value2)
self.assertEqual(traceback.format_tb(tb)[-1], traceback.format_tb(tb2)[-1])
else:
self.fail("The exception was not raised.")
class Python3BytesTests(SynchronousTestCase):
"""
Tests for L{iterbytes}, L{intToBytes}, L{lazyByteSlice}.
"""
def test_iteration(self):
"""
When L{iterbytes} is called with a bytestring, the returned object
can be iterated over, resulting in the individual bytes of the
bytestring.
"""
input = b"abcd"
result = list(iterbytes(input))
self.assertEqual(result, [b"a", b"b", b"c", b"d"])
def test_intToBytes(self):
"""
When L{intToBytes} is called with an integer, the result is an
ASCII-encoded string representation of the number.
"""
self.assertEqual(intToBytes(213), b"213")
def test_lazyByteSliceNoOffset(self):
"""
L{lazyByteSlice} called with some bytes returns a semantically equal
version of these bytes.
"""
data = b"123XYZ"
self.assertEqual(bytes(lazyByteSlice(data)), data)
def test_lazyByteSliceOffset(self):
"""
L{lazyByteSlice} called with some bytes and an offset returns a
semantically equal version of these bytes starting at the given offset.
"""
data = b"123XYZ"
self.assertEqual(bytes(lazyByteSlice(data, 2)), data[2:])
def test_lazyByteSliceOffsetAndLength(self):
"""
L{lazyByteSlice} called with some bytes, an offset and a length returns
a semantically equal version of these bytes starting at the given
offset, up to the given length.
"""
data = b"123XYZ"
self.assertEqual(bytes(lazyByteSlice(data, 2, 3)), data[2:5])
class BytesEnvironTests(TestCase):
"""
Tests for L{BytesEnviron}.
"""
@skipIf(platform.isWindows(), "Environment vars are always str on Windows.")
def test_alwaysBytes(self):
"""
The output of L{BytesEnviron} should always be a L{dict} with L{bytes}
values and L{bytes} keys.
"""
result = bytesEnviron()
types = set()
for key, val in result.items():
types.add(type(key))
types.add(type(val))
self.assertEqual(list(types), [bytes])
class GetAsyncParamTests(SynchronousTestCase):
"""
Tests for L{twisted.python.compat._get_async_param}
"""
def test_get_async_param(self):
"""
L{twisted.python.compat._get_async_param} uses isAsync by default,
or deprecated async keyword argument if isAsync is None.
"""
self.assertEqual(_get_async_param(isAsync=False), False)
self.assertEqual(_get_async_param(isAsync=True), True)
self.assertEqual(_get_async_param(isAsync=None, **{"async": False}), False)
self.assertEqual(_get_async_param(isAsync=None, **{"async": True}), True)
self.assertRaises(TypeError, _get_async_param, False, {"async": False})
def test_get_async_param_deprecation(self):
"""
L{twisted.python.compat._get_async_param} raises a deprecation
warning if async keyword argument is passed.
"""
self.assertEqual(_get_async_param(isAsync=None, **{"async": False}), False)
currentWarnings = self.flushWarnings(
offendingFunctions=[self.test_get_async_param_deprecation]
)
self.assertEqual(
currentWarnings[0]["message"],
"'async' keyword argument is deprecated, please use isAsync",
)
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