51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
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import pytest
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from attr._compat import metadata_proxy
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@pytest.fixture(name="mp")
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def _mp():
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return metadata_proxy({"x": 42, "y": "foo"})
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class TestMetadataProxy:
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"""
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Ensure properties of metadata_proxy independently of hypothesis strategies.
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"""
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def test_repr(self, mp):
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"""
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repr makes sense and is consistent across Python versions.
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"""
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assert any(
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[
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"mappingproxy({'x': 42, 'y': 'foo'})" == repr(mp),
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"mappingproxy({'y': 'foo', 'x': 42})" == repr(mp),
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]
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)
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def test_immutable(self, mp):
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"""
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All mutating methods raise errors.
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"""
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with pytest.raises(TypeError, match="not support item assignment"):
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mp["z"] = 23
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with pytest.raises(TypeError, match="not support item deletion"):
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del mp["x"]
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with pytest.raises(AttributeError, match="no attribute 'update'"):
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mp.update({})
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with pytest.raises(AttributeError, match="no attribute 'clear'"):
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mp.clear()
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with pytest.raises(AttributeError, match="no attribute 'pop'"):
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mp.pop("x")
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with pytest.raises(AttributeError, match="no attribute 'popitem'"):
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mp.popitem("x")
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with pytest.raises(AttributeError, match="no attribute 'setdefault'"):
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mp.setdefault("x")
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