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- import os
- import sys
- import pytest
- import matplotlib.backends.backend_webagg_core
- from matplotlib.testing import subprocess_run_for_testing
- @pytest.mark.parametrize("backend", ["webagg", "nbagg"])
- def test_webagg_fallback(backend):
- pytest.importorskip("tornado")
- if backend == "nbagg":
- pytest.importorskip("IPython")
- env = dict(os.environ)
- if sys.platform != "win32":
- env["DISPLAY"] = ""
- env["MPLBACKEND"] = backend
- test_code = (
- "import os;"
- + f"assert os.environ['MPLBACKEND'] == '{backend}';"
- + "import matplotlib.pyplot as plt; "
- + "print(plt.get_backend());"
- f"assert '{backend}' == plt.get_backend().lower();"
- )
- subprocess_run_for_testing([sys.executable, "-c", test_code], env=env, check=True)
- def test_webagg_core_no_toolbar():
- fm = matplotlib.backends.backend_webagg_core.FigureManagerWebAgg
- assert fm._toolbar2_class is None
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