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import subprocess
import os
import sys
import pytest
@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 os.name != "nt":
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();"
)
ret = subprocess.call([sys.executable, "-c", test_code], env=env)
assert ret == 0