Current File : //lib/python3/dist-packages/twisted/test/test_strerror.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test strerror
"""
import os
import socket
from unittest import skipIf
from twisted.internet.tcp import ECONNABORTED
from twisted.python.runtime import platform
from twisted.python.win32 import _ErrorFormatter, formatError
from twisted.trial.unittest import TestCase
class _MyWindowsException(OSError):
"""
An exception type like L{ctypes.WinError}, but available on all platforms.
"""
class ErrorFormatingTests(TestCase):
"""
Tests for C{_ErrorFormatter.formatError}.
"""
probeErrorCode = ECONNABORTED
probeMessage = "correct message value"
def test_strerrorFormatting(self):
"""
L{_ErrorFormatter.formatError} should use L{os.strerror} to format
error messages if it is constructed without any better mechanism.
"""
formatter = _ErrorFormatter(None, None, None)
message = formatter.formatError(self.probeErrorCode)
self.assertEqual(message, os.strerror(self.probeErrorCode))
def test_emptyErrorTab(self):
"""
L{_ErrorFormatter.formatError} should use L{os.strerror} to format
error messages if it is constructed with only an error tab which does
not contain the error code it is called with.
"""
error = 1
# Sanity check
self.assertNotEqual(self.probeErrorCode, error)
formatter = _ErrorFormatter(None, None, {error: "wrong message"})
message = formatter.formatError(self.probeErrorCode)
self.assertEqual(message, os.strerror(self.probeErrorCode))
def test_errorTab(self):
"""
L{_ErrorFormatter.formatError} should use C{errorTab} if it is supplied
and contains the requested error code.
"""
formatter = _ErrorFormatter(
None, None, {self.probeErrorCode: self.probeMessage}
)
message = formatter.formatError(self.probeErrorCode)
self.assertEqual(message, self.probeMessage)
def test_formatMessage(self):
"""
L{_ErrorFormatter.formatError} should return the return value of
C{formatMessage} if it is supplied.
"""
formatCalls = []
def formatMessage(errorCode):
formatCalls.append(errorCode)
return self.probeMessage
formatter = _ErrorFormatter(
None, formatMessage, {self.probeErrorCode: "wrong message"}
)
message = formatter.formatError(self.probeErrorCode)
self.assertEqual(message, self.probeMessage)
self.assertEqual(formatCalls, [self.probeErrorCode])
def test_winError(self):
"""
L{_ErrorFormatter.formatError} should return the message argument from
the exception L{winError} returns, if L{winError} is supplied.
"""
winCalls = []
def winError(errorCode):
winCalls.append(errorCode)
return _MyWindowsException(errorCode, self.probeMessage)
formatter = _ErrorFormatter(
winError,
lambda error: "formatMessage: wrong message",
{self.probeErrorCode: "errorTab: wrong message"},
)
message = formatter.formatError(self.probeErrorCode)
self.assertEqual(message, self.probeMessage)
@skipIf(platform.getType() != "win32", "Test will run only on Windows.")
def test_fromEnvironment(self):
"""
L{_ErrorFormatter.fromEnvironment} should create an L{_ErrorFormatter}
instance with attributes populated from available modules.
"""
formatter = _ErrorFormatter.fromEnvironment()
if formatter.winError is not None:
from ctypes import WinError
self.assertEqual(
formatter.formatError(self.probeErrorCode),
WinError(self.probeErrorCode).strerror,
)
formatter.winError = None
if formatter.formatMessage is not None:
from win32api import FormatMessage
self.assertEqual(
formatter.formatError(self.probeErrorCode),
FormatMessage(self.probeErrorCode),
)
formatter.formatMessage = None
if formatter.errorTab is not None:
from socket import errorTab
self.assertEqual(
formatter.formatError(self.probeErrorCode),
errorTab[self.probeErrorCode],
)
@skipIf(platform.getType() != "win32", "Test will run only on Windows.")
def test_correctLookups(self):
"""
Given a known-good errno, make sure that formatMessage gives results
matching either C{socket.errorTab}, C{ctypes.WinError}, or
C{win32api.FormatMessage}.
"""
acceptable = [socket.errorTab[ECONNABORTED]]
try:
from ctypes import WinError
acceptable.append(WinError(ECONNABORTED).strerror)
except ImportError:
pass
try:
from win32api import FormatMessage
acceptable.append(FormatMessage(ECONNABORTED))
except ImportError:
pass
self.assertIn(formatError(ECONNABORTED), acceptable)
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