97 lines
2.6 KiB
Python
97 lines
2.6 KiB
Python
"""
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"monkeypatch" funcarg for safely patching objects,
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dictionaries and environment variables during the execution of
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a test. "monkeypatch" has three helper functions:
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monkeypatch.setattr(obj, name, value)
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monkeypatch.setitem(obj, name, value)
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monkeypatch.setenv(name, value)
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After the test has run modifications will be undone.
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"""
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import os
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def pytest_funcarg__monkeypatch(request):
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monkeypatch = MonkeyPatch()
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request.addfinalizer(monkeypatch.finalize)
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return monkeypatch
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notset = object()
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class MonkeyPatch:
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def __init__(self):
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self._setattr = []
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self._setitem = []
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def setattr(self, obj, name, value):
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self._setattr.insert(0, (obj, name, getattr(obj, name, notset)))
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setattr(obj, name, value)
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def setitem(self, dictionary, name, value):
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self._setitem.insert(0, (dictionary, name, dictionary.get(name, notset)))
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dictionary[name] = value
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def setenv(self, name, value):
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self.setitem(os.environ, name, str(value))
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def finalize(self):
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for obj, name, value in self._setattr:
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if value is not notset:
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setattr(obj, name, value)
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else:
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delattr(obj, name)
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for dictionary, name, value in self._setitem:
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if value is notset:
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del dictionary[name]
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else:
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dictionary[name] = value
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def test_setattr():
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class A:
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x = 1
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monkeypatch = MonkeyPatch()
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monkeypatch.setattr(A, 'x', 2)
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assert A.x == 2
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monkeypatch.setattr(A, 'x', 3)
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assert A.x == 3
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monkeypatch.finalize()
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assert A.x == 1
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monkeypatch.setattr(A, 'y', 3)
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assert A.y == 3
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monkeypatch.finalize()
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assert not hasattr(A, 'y')
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def test_setitem():
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d = {'x': 1}
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monkeypatch = MonkeyPatch()
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monkeypatch.setitem(d, 'x', 2)
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monkeypatch.setitem(d, 'y', 1700)
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assert d['x'] == 2
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assert d['y'] == 1700
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monkeypatch.setitem(d, 'x', 3)
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assert d['x'] == 3
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monkeypatch.finalize()
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assert d['x'] == 1
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assert 'y' not in d
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def test_setenv():
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monkeypatch = MonkeyPatch()
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monkeypatch.setenv('XYZ123', 2)
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import os
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assert os.environ['XYZ123'] == "2"
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monkeypatch.finalize()
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assert 'XYZ123' not in os.environ
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def test_monkeypatch_plugin(testdir):
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reprec = testdir.inline_runsource("""
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pytest_plugins = 'pytest_monkeypatch',
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def test_method(monkeypatch):
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assert monkeypatch.__class__.__name__ == "MonkeyPatch"
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""")
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res = reprec.countoutcomes()
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assert tuple(res) == (1, 0, 0), res
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