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99 lines
3.3 KiB
99 lines
3.3 KiB
1 year ago
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import sys
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import types
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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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@pytest.fixture
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def dummy_backend():
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db = types.ModuleType("pandas_dummy_backend")
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setattr(db, "plot", lambda *args, **kwargs: "used_dummy")
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return db
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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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with pandas.option_context("plotting.backend", "matplotlib"):
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yield
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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, dummy_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, dummy_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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def test_register_entrypoint(restore_backend, tmp_path, monkeypatch, dummy_backend):
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monkeypatch.syspath_prepend(tmp_path)
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monkeypatch.setitem(sys.modules, "pandas_dummy_backend", dummy_backend)
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dist_info = tmp_path / "my_backend-0.0.0.dist-info"
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dist_info.mkdir()
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# entry_point name should not match module name - otherwise pandas will
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# fall back to backend lookup by module name
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(dist_info / "entry_points.txt").write_bytes(
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b"[pandas_plotting_backends]\nmy_ep_backend = pandas_dummy_backend\n"
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)
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assert pandas.plotting._core._get_plot_backend("my_ep_backend") is dummy_backend
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with pandas.option_context("plotting.backend", "my_ep_backend"):
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assert pandas.plotting._core._get_plot_backend() is dummy_backend
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def test_setting_backend_without_plot_raises(monkeypatch):
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# GH-28163
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module = types.ModuleType("pandas_plot_backend")
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monkeypatch.setitem(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, dummy_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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