TST: force backend resolution in pyplot

tacaswell · tacaswell · commit b57b94e22f5f · 2021-12-18T22:33:05.000-05:00
diff --git a/lib/matplotlib/tests/test_rcparams.py b/lib/matplotlib/tests/test_rcparams.py
@@ -497,7 +497,8 @@ def test_backend_fallback_headless(tmpdir):
             [sys.executable, "-c",
              "import matplotlib;"
              "matplotlib.use('tkagg');"
-             "import matplotlib.pyplot"
+             "import matplotlib.pyplot;"
+             "matplotlib.pyplot.plot(42);"
              ],
             env=env, check=True, stderr=subprocess.DEVNULL)
 
