# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Tests for L{twisted.python._inotify}.
"""

from twisted.trial.unittest import TestCase
from twisted.python.runtime import platform

if platform.supportsINotify():
from ctypes import c_int, c_uint32, c_char_p
from twisted.python import _inotify
from twisted.python._inotify import (
INotifyError, initializeModule, init, add)
else:
_inotify = None



class INotifyTests(TestCase):
"""
Tests for L{twisted.python._inotify}.
"""
if _inotify is None:
skip = "This platform doesn't support INotify."

def test_missingInit(self):
"""
If the I{libc} object passed to L{initializeModule} has no
C{inotify_init} attribute, L{ImportError} is raised.
"""
class libc:
def inotify_add_watch(self):
pass
def inotify_rm_watch(self):
pass
self.assertRaises(ImportError, initializeModule, libc())


def test_missingAdd(self):
"""
If the I{libc} object passed to L{initializeModule} has no
C{inotify_add_watch} attribute, L{ImportError} is raised.
"""
class libc:
def inotify_init(self):
pass
def inotify_rm_watch(self):
pass
self.assertRaises(ImportError, initializeModule, libc())


def test_missingRemove(self):
"""
If the I{libc} object passed to L{initializeModule} has no
C{inotify_rm_watch} attribute, L{ImportError} is raised.
"""
class libc:
def inotify_init(self):
pass
def inotify_add_watch(self):
pass
self.assertRaises(ImportError, initializeModule, libc())


def test_setTypes(self):
"""
If the I{libc} object passed to L{initializeModule} has all of the
necessary attributes, it sets the C{argtypes} and C{restype} attributes
of the three ctypes methods used from libc.
"""
class libc:
def inotify_init(self):
pass
inotify_init = staticmethod(inotify_init)

def inotify_rm_watch(self):
pass
inotify_rm_watch = staticmethod(inotify_rm_watch)

def inotify_add_watch(self):
pass
inotify_add_watch = staticmethod(inotify_add_watch)

c = libc()
initializeModule(c)
self.assertEqual(c.inotify_init.argtypes, [])
self.assertEqual(c.inotify_init.restype, c_int)

self.assertEqual(c.inotify_rm_watch.argtypes, [c_int, c_int])
self.assertEqual(c.inotify_rm_watch.restype, c_int)

self.assertEqual(
c.inotify_add_watch.argtypes, [c_int, c_char_p, c_uint32])
self.assertEqual(c.inotify_add_watch.restype, c_int)


def test_failedInit(self):
"""
If C{inotify_init} returns a negative number, L{init} raises
L{INotifyError}.
"""
class libc:
def inotify_init(self):
return -1
self.patch(_inotify, 'libc', libc())
self.assertRaises(INotifyError, init)


def test_failedAddWatch(self):
"""
If C{inotify_add_watch} returns a negative number, L{add}
raises L{INotifyError}.
"""
class libc:
def inotify_add_watch(self, fd, path, mask):
return -1
self.patch(_inotify, 'libc', libc())
self.assertRaises(INotifyError, add, 3, '/foo', 0)