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TST: test that the .copy method on indexes copy the cache #32898

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Merged
merged 2 commits into from
Mar 22, 2020
Merged

TST: test that the .copy method on indexes copy the cache #32898

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TST: test that Index.copy copies the cache
topper-123 Mar 21, 2020
1f48640
Correct github issue numbers
topper-123 Mar 21, 2020
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15 changes: 14 additions & 1 deletion pandas/tests/indexes/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -912,8 +912,21 @@ def test_contains_requires_hashable_raises(self):
with pytest.raises(TypeError):
{} in idx._engine

def test_copy_copies_cache(self):
# GH32883
idx = self.create_index()
idx.get_loc(idx[0]) # populates the _cache.
copy = idx.copy()

# check that the copied cache is a copy of the original
assert idx._cache == copy._cache
assert idx._cache is not copy._cache
# cache values should reference the same object
for key, val in idx._cache.items():
assert copy._cache[key] is val, key

def test_shallow_copy_copies_cache(self):
# GH32669
# GH32898
idx = self.create_index()
idx.get_loc(idx[0]) # populates the _cache.
shallow_copy = idx._shallow_copy()
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