Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/tests/test_backend_webagg.py

@@ -0,0 +1,27 @@
+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