test_error.py - mozsearch

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import py

import errno

import sys

import subprocess

def test_error_classes():

    for name in errno.errorcode.values():

        x = getattr(py.error, name)

        assert issubclass(x, py.error.Error)

        assert issubclass(x, EnvironmentError)

def test_has_name():

    assert py.error.__name__ == 'py.error'

def test_picklability_issue1():

    import pickle

    e1 = py.error.ENOENT()

    s = pickle.dumps(e1)

    e2 = pickle.loads(s)

    assert isinstance(e2, py.error.ENOENT)

def test_unknown_error():

    num = 3999

    cls = py.error._geterrnoclass(num)

    assert cls.__name__ == 'UnknownErrno%d' % (num,)

    assert issubclass(cls, py.error.Error)

    assert issubclass(cls, EnvironmentError)

    cls2 = py.error._geterrnoclass(num)

    assert cls is cls2

def test_error_conversion_enotdir(testdir):

    p = testdir.makepyfile("")

    excinfo = py.test.raises(py.error.Error, py.error.checked_call, p.listdir)

    assert isinstance(excinfo.value, EnvironmentError)

    assert isinstance(excinfo.value, py.error.Error)

    assert "ENOTDIR" in repr(excinfo.value)

def test_checked_call_supports_kwargs(tmpdir):

    import tempfile

    py.error.checked_call(tempfile.mkdtemp, dir=str(tmpdir))

def test_error_importable():

    """Regression test for #179"""

    subprocess.check_call(

        [sys.executable, '-c', 'from py.error import ENOENT'])

try:

    import unittest

    unittest.TestCase.assertWarns

except (ImportError, AttributeError):

    pass  # required interface not available

else:

    import sys

    import warnings

    class Case(unittest.TestCase):

        def test_assert_warns(self):

            # Clear everything "py.*" from sys.modules and re-import py

            # as a fresh start

            for mod in tuple(sys.modules.keys()):

                if mod and (mod == 'py' or mod.startswith('py.')):

                    del sys.modules[mod]

            __import__('py')

            with self.assertWarns(UserWarning):

                warnings.warn('this should work')