test_ok2/testing/test_monkeypatch.py

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from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
import re
import sys
import textwrap
import six
import pytest
from _pytest.monkeypatch import MonkeyPatch
@pytest.fixture
def mp():
cwd = os.getcwd()
sys_path = list(sys.path)
yield MonkeyPatch()
sys.path[:] = sys_path
os.chdir(cwd)
def test_setattr():
class A(object):
x = 1
monkeypatch = MonkeyPatch()
pytest.raises(AttributeError, monkeypatch.setattr, A, "notexists", 2)
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monkeypatch.setattr(A, "y", 2, raising=False)
assert A.y == 2
monkeypatch.undo()
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assert not hasattr(A, "y")
monkeypatch = MonkeyPatch()
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monkeypatch.setattr(A, "x", 2)
assert A.x == 2
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monkeypatch.setattr(A, "x", 3)
assert A.x == 3
monkeypatch.undo()
assert A.x == 1
A.x = 5
monkeypatch.undo() # double-undo makes no modification
assert A.x == 5
class TestSetattrWithImportPath(object):
def test_string_expression(self, monkeypatch):
monkeypatch.setattr("os.path.abspath", lambda x: "hello2")
assert os.path.abspath("123") == "hello2"
def test_string_expression_class(self, monkeypatch):
monkeypatch.setattr("_pytest.config.Config", 42)
import _pytest
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assert _pytest.config.Config == 42
def test_unicode_string(self, monkeypatch):
monkeypatch.setattr("_pytest.config.Config", 42)
import _pytest
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assert _pytest.config.Config == 42
monkeypatch.delattr("_pytest.config.Config")
def test_wrong_target(self, monkeypatch):
pytest.raises(TypeError, lambda: monkeypatch.setattr(None, None))
def test_unknown_import(self, monkeypatch):
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pytest.raises(ImportError, lambda: monkeypatch.setattr("unkn123.classx", None))
def test_unknown_attr(self, monkeypatch):
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pytest.raises(
AttributeError, lambda: monkeypatch.setattr("os.path.qweqwe", None)
)
def test_unknown_attr_non_raising(self, monkeypatch):
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# https://github.com/pytest-dev/pytest/issues/746
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monkeypatch.setattr("os.path.qweqwe", 42, raising=False)
assert os.path.qweqwe == 42
def test_delattr(self, monkeypatch):
monkeypatch.delattr("os.path.abspath")
assert not hasattr(os.path, "abspath")
monkeypatch.undo()
assert os.path.abspath
def test_delattr():
class A(object):
x = 1
monkeypatch = MonkeyPatch()
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monkeypatch.delattr(A, "x")
assert not hasattr(A, "x")
monkeypatch.undo()
assert A.x == 1
monkeypatch = MonkeyPatch()
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monkeypatch.delattr(A, "x")
pytest.raises(AttributeError, monkeypatch.delattr, A, "y")
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monkeypatch.delattr(A, "y", raising=False)
monkeypatch.setattr(A, "x", 5, raising=False)
assert A.x == 5
monkeypatch.undo()
assert A.x == 1
def test_setitem():
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d = {"x": 1}
monkeypatch = MonkeyPatch()
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monkeypatch.setitem(d, "x", 2)
monkeypatch.setitem(d, "y", 1700)
monkeypatch.setitem(d, "y", 1700)
assert d["x"] == 2
assert d["y"] == 1700
monkeypatch.setitem(d, "x", 3)
assert d["x"] == 3
monkeypatch.undo()
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assert d["x"] == 1
assert "y" not in d
d["x"] = 5
monkeypatch.undo()
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assert d["x"] == 5
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def test_setitem_deleted_meanwhile():
d = {}
monkeypatch = MonkeyPatch()
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monkeypatch.setitem(d, "x", 2)
del d["x"]
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monkeypatch.undo()
assert not d
@pytest.mark.parametrize("before", [True, False])
def test_setenv_deleted_meanwhile(before):
key = "qwpeoip123"
if before:
os.environ[key] = "world"
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monkeypatch = MonkeyPatch()
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monkeypatch.setenv(key, "hello")
del os.environ[key]
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monkeypatch.undo()
if before:
assert os.environ[key] == "world"
del os.environ[key]
else:
assert key not in os.environ
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def test_delitem():
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d = {"x": 1}
monkeypatch = MonkeyPatch()
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monkeypatch.delitem(d, "x")
assert "x" not in d
monkeypatch.delitem(d, "y", raising=False)
pytest.raises(KeyError, monkeypatch.delitem, d, "y")
assert not d
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monkeypatch.setitem(d, "y", 1700)
assert d["y"] == 1700
d["hello"] = "world"
monkeypatch.setitem(d, "x", 1500)
assert d["x"] == 1500
monkeypatch.undo()
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assert d == {"hello": "world", "x": 1}
def test_setenv():
monkeypatch = MonkeyPatch()
with pytest.warns(pytest.PytestWarning):
monkeypatch.setenv("XYZ123", 2)
import os
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assert os.environ["XYZ123"] == "2"
monkeypatch.undo()
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assert "XYZ123" not in os.environ
def test_delenv():
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name = "xyz1234"
assert name not in os.environ
monkeypatch = MonkeyPatch()
pytest.raises(KeyError, monkeypatch.delenv, name, raising=True)
monkeypatch.delenv(name, raising=False)
monkeypatch.undo()
os.environ[name] = "1"
try:
monkeypatch = MonkeyPatch()
monkeypatch.delenv(name)
assert name not in os.environ
monkeypatch.setenv(name, "3")
assert os.environ[name] == "3"
monkeypatch.undo()
assert os.environ[name] == "1"
finally:
if name in os.environ:
del os.environ[name]
class TestEnvironWarnings(object):
"""
os.environ keys and values should be native strings, otherwise it will cause problems with other modules (notably
subprocess). On Python 2 os.environ accepts anything without complaining, while Python 3 does the right thing
and raises an error.
"""
VAR_NAME = u"PYTEST_INTERNAL_MY_VAR"
@pytest.mark.skipif(six.PY3, reason="Python 2 only test")
def test_setenv_unicode_key(self, monkeypatch):
with pytest.warns(
pytest.PytestWarning,
match="Environment variable name {!r} should be str".format(self.VAR_NAME),
):
monkeypatch.setenv(self.VAR_NAME, "2")
@pytest.mark.skipif(six.PY3, reason="Python 2 only test")
def test_delenv_unicode_key(self, monkeypatch):
with pytest.warns(
pytest.PytestWarning,
match="Environment variable name {!r} should be str".format(self.VAR_NAME),
):
monkeypatch.delenv(self.VAR_NAME, raising=False)
def test_setenv_non_str_warning(self, monkeypatch):
value = 2
msg = (
"Value of environment variable PYTEST_INTERNAL_MY_VAR type should be str, "
"but got 2 (type: int); converted to str implicitly"
)
with pytest.warns(pytest.PytestWarning, match=re.escape(msg)):
monkeypatch.setenv(str(self.VAR_NAME), value)
def test_setenv_prepend():
import os
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monkeypatch = MonkeyPatch()
with pytest.warns(pytest.PytestWarning):
monkeypatch.setenv("XYZ123", 2, prepend="-")
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assert os.environ["XYZ123"] == "2"
with pytest.warns(pytest.PytestWarning):
monkeypatch.setenv("XYZ123", 3, prepend="-")
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assert os.environ["XYZ123"] == "3-2"
monkeypatch.undo()
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assert "XYZ123" not in os.environ
def test_monkeypatch_plugin(testdir):
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reprec = testdir.inline_runsource(
"""
def test_method(monkeypatch):
assert monkeypatch.__class__.__name__ == "MonkeyPatch"
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"""
)
res = reprec.countoutcomes()
assert tuple(res) == (1, 0, 0), res
def test_syspath_prepend(mp):
old = list(sys.path)
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mp.syspath_prepend("world")
mp.syspath_prepend("hello")
assert sys.path[0] == "hello"
assert sys.path[1] == "world"
mp.undo()
assert sys.path == old
mp.undo()
assert sys.path == old
def test_syspath_prepend_double_undo(mp):
old_syspath = sys.path[:]
try:
mp.syspath_prepend("hello world")
mp.undo()
sys.path.append("more hello world")
mp.undo()
assert sys.path[-1] == "more hello world"
finally:
sys.path[:] = old_syspath
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def test_chdir_with_path_local(mp, tmpdir):
mp.chdir(tmpdir)
assert os.getcwd() == tmpdir.strpath
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def test_chdir_with_str(mp, tmpdir):
mp.chdir(tmpdir.strpath)
assert os.getcwd() == tmpdir.strpath
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def test_chdir_undo(mp, tmpdir):
cwd = os.getcwd()
mp.chdir(tmpdir)
mp.undo()
assert os.getcwd() == cwd
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def test_chdir_double_undo(mp, tmpdir):
mp.chdir(tmpdir.strpath)
mp.undo()
tmpdir.chdir()
mp.undo()
assert os.getcwd() == tmpdir.strpath
def test_issue185_time_breaks(testdir):
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testdir.makepyfile(
"""
import time
def test_m(monkeypatch):
def f():
raise Exception
monkeypatch.setattr(time, "time", f)
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"""
)
result = testdir.runpytest()
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result.stdout.fnmatch_lines(
"""
*1 passed*
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"""
)
def test_importerror(testdir):
p = testdir.mkpydir("package")
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p.join("a.py").write(
textwrap.dedent(
"""\
import doesnotexist
x = 1
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"""
)
)
testdir.tmpdir.join("test_importerror.py").write(
textwrap.dedent(
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"""\
def test_importerror(monkeypatch):
monkeypatch.setattr('package.a.x', 2)
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"""
)
)
result = testdir.runpytest()
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result.stdout.fnmatch_lines(
"""
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*import error in package.a: No module named {0}doesnotexist{0}*
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""".format(
"'" if sys.version_info > (3, 0) else ""
)
)
class SampleNew(object):
@staticmethod
def hello():
return True
class SampleNewInherit(SampleNew):
pass
class SampleOld(object):
# oldstyle on python2
@staticmethod
def hello():
return True
class SampleOldInherit(SampleOld):
pass
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@pytest.mark.parametrize(
"Sample",
[SampleNew, SampleNewInherit, SampleOld, SampleOldInherit],
ids=["new", "new-inherit", "old", "old-inherit"],
)
def test_issue156_undo_staticmethod(Sample):
monkeypatch = MonkeyPatch()
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monkeypatch.setattr(Sample, "hello", None)
assert Sample.hello is None
monkeypatch.undo()
assert Sample.hello()
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def test_undo_class_descriptors_delattr():
class SampleParent(object):
@classmethod
def hello(_cls):
pass
@staticmethod
def world():
pass
class SampleChild(SampleParent):
pass
monkeypatch = MonkeyPatch()
original_hello = SampleChild.hello
original_world = SampleChild.world
monkeypatch.delattr(SampleParent, "hello")
monkeypatch.delattr(SampleParent, "world")
assert getattr(SampleParent, "hello", None) is None
assert getattr(SampleParent, "world", None) is None
monkeypatch.undo()
assert original_hello == SampleChild.hello
assert original_world == SampleChild.world
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def test_issue1338_name_resolving():
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pytest.importorskip("requests")
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monkeypatch = MonkeyPatch()
try:
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monkeypatch.delattr("requests.sessions.Session.request")
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finally:
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monkeypatch.undo()
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def test_context():
monkeypatch = MonkeyPatch()
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import functools
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import inspect
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with monkeypatch.context() as m:
m.setattr(functools, "partial", 3)
assert not inspect.isclass(functools.partial)
assert inspect.isclass(functools.partial)
def test_syspath_prepend_with_namespace_packages(testdir, monkeypatch):
for dirname in "hello", "world":
d = testdir.mkdir(dirname)
ns = d.mkdir("ns_pkg")
ns.join("__init__.py").write(
"__import__('pkg_resources').declare_namespace(__name__)"
)
lib = ns.mkdir(dirname)
lib.join("__init__.py").write("def check(): return %r" % dirname)
monkeypatch.syspath_prepend("hello")
import ns_pkg.hello
assert ns_pkg.hello.check() == "hello"
with pytest.raises(ImportError):
import ns_pkg.world
# Prepending should call fixup_namespace_packages.
monkeypatch.syspath_prepend("world")
import ns_pkg.world
assert ns_pkg.world.check() == "world"
# Should invalidate caches via importlib.invalidate_caches.
tmpdir = testdir.tmpdir
modules_tmpdir = tmpdir.mkdir("modules_tmpdir")
monkeypatch.syspath_prepend(str(modules_tmpdir))
modules_tmpdir.join("main_app.py").write("app = True")
from main_app import app # noqa: F401