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])