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111 lines
3.6 KiB
111 lines
3.6 KiB
import sys
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import types
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import pkg_resources
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import pytest
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import pandas.util._test_decorators as td
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import pandas
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dummy_backend = types.ModuleType("pandas_dummy_backend")
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setattr(dummy_backend, "plot", lambda *args, **kwargs: "used_dummy")
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pytestmark = pytest.mark.slow
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@pytest.fixture
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def restore_backend():
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"""Restore the plotting backend to matplotlib"""
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pandas.set_option("plotting.backend", "matplotlib")
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yield
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pandas.set_option("plotting.backend", "matplotlib")
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def test_backend_is_not_module():
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msg = "Could not find plotting backend 'not_an_existing_module'."
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with pytest.raises(ValueError, match=msg):
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pandas.set_option("plotting.backend", "not_an_existing_module")
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assert pandas.options.plotting.backend == "matplotlib"
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def test_backend_is_correct(monkeypatch, restore_backend):
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monkeypatch.setitem(sys.modules, "pandas_dummy_backend", dummy_backend)
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pandas.set_option("plotting.backend", "pandas_dummy_backend")
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assert pandas.get_option("plotting.backend") == "pandas_dummy_backend"
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assert (
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pandas.plotting._core._get_plot_backend("pandas_dummy_backend") is dummy_backend
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)
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def test_backend_can_be_set_in_plot_call(monkeypatch, restore_backend):
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monkeypatch.setitem(sys.modules, "pandas_dummy_backend", dummy_backend)
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df = pandas.DataFrame([1, 2, 3])
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assert pandas.get_option("plotting.backend") == "matplotlib"
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assert df.plot(backend="pandas_dummy_backend") == "used_dummy"
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@td.skip_if_no_mpl
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def test_register_entrypoint(restore_backend):
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dist = pkg_resources.get_distribution("pandas")
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if dist.module_path not in pandas.__file__:
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# We are running from a non-installed pandas, and this test is invalid
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pytest.skip("Testing a non-installed pandas")
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mod = types.ModuleType("my_backend")
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mod.plot = lambda *args, **kwargs: 1
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backends = pkg_resources.get_entry_map("pandas")
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my_entrypoint = pkg_resources.EntryPoint(
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"pandas_plotting_backend", mod.__name__, dist=dist
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)
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backends["pandas_plotting_backends"]["my_backend"] = my_entrypoint
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# TODO: the docs recommend importlib.util.module_from_spec. But this works for now.
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sys.modules["my_backend"] = mod
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result = pandas.plotting._core._get_plot_backend("my_backend")
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assert result is mod
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# TODO(GH#27517): https://github.com/pandas-dev/pandas/issues/27517
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# Remove the td.skip_if_no_mpl
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with pandas.option_context("plotting.backend", "my_backend"):
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result = pandas.plotting._core._get_plot_backend()
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assert result is mod
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def test_setting_backend_without_plot_raises():
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# GH-28163
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module = types.ModuleType("pandas_plot_backend")
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sys.modules["pandas_plot_backend"] = module
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assert pandas.options.plotting.backend == "matplotlib"
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with pytest.raises(
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ValueError, match="Could not find plotting backend 'pandas_plot_backend'."
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):
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pandas.set_option("plotting.backend", "pandas_plot_backend")
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assert pandas.options.plotting.backend == "matplotlib"
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@td.skip_if_mpl
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def test_no_matplotlib_ok():
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msg = (
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'matplotlib is required for plotting when the default backend "matplotlib" is '
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"selected."
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)
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with pytest.raises(ImportError, match=msg):
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pandas.plotting._core._get_plot_backend("matplotlib")
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def test_extra_kinds_ok(monkeypatch, restore_backend):
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# https://github.com/pandas-dev/pandas/pull/28647
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monkeypatch.setitem(sys.modules, "pandas_dummy_backend", dummy_backend)
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pandas.set_option("plotting.backend", "pandas_dummy_backend")
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df = pandas.DataFrame({"A": [1, 2, 3]})
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df.plot(kind="not a real kind")
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