Static code analysis and corrections

utils/venv/lib/python3.6/site-packages/matplotlib/tests/test_pyplot.py

@@ -0,0 +1,38 @@
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+import matplotlib as mpl
+from matplotlib import pyplot as plt
+
+
+def test_pyplot_up_to_date():
+    gen_script = Path(mpl.__file__).parents[2] / "tools/boilerplate.py"
+    if not gen_script.exists():
+        pytest.skip("boilerplate.py not found")
+    orig_contents = Path(plt.__file__).read_text()
+    try:
+        subprocess.run([sys.executable, str(gen_script)], check=True)
+        new_contents = Path(plt.__file__).read_text()
+        assert orig_contents == new_contents
+    finally:
+        Path(plt.__file__).write_text(orig_contents)
+
+
+def test_pyplot_box():
+    fig, ax = plt.subplots()
+    plt.box(False)
+    assert not ax.get_frame_on()
+    plt.box(True)
+    assert ax.get_frame_on()
+    plt.box()
+    assert not ax.get_frame_on()
+    plt.box()
+    assert ax.get_frame_on()
+
+
+def test_stackplot_smoke():
+    # Small smoke test for stackplot (see #12405)
+    plt.stackplot([1, 2, 3], [1, 2, 3])