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TST: skip test if running non-installed #27810

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Aug 13, 2019
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TST: skip test if running non-installed #27810

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10 changes: 7 additions & 3 deletions pandas/tests/plotting/test_backend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,14 +46,18 @@ def test_backend_is_correct(monkeypatch):

@td.skip_if_no_mpl
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why doesn't this work in this case?

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The issue is running the tests from a non-virtualenv-like setup. So matplotlib is installed, but the pandas being tested is not in site-packages

def test_register_entrypoint():

dist = pkg_resources.get_distribution("pandas")
if dist.module_path not in pandas.__file__:
# We are running from a non-installed pandas, and this test is invalid
pytest.skip("Testing a non-installed pandas")

mod = types.ModuleType("my_backend")
mod.plot = lambda *args, **kwargs: 1

backends = pkg_resources.get_entry_map("pandas")
my_entrypoint = pkg_resources.EntryPoint(
"pandas_plotting_backend",
mod.__name__,
dist=pkg_resources.get_distribution("pandas"),
"pandas_plotting_backend", mod.__name__, dist=dist
)
backends["pandas_plotting_backends"]["my_backend"] = my_entrypoint
# TODO: the docs recommend importlib.util.module_from_spec. But this works for now.
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