Add test.

anntzer · anntzer · commit c8b396c953ef · 2019-01-10T00:55:28.000+01:00
diff --git a/lib/matplotlib/cbook/deprecation.py b/lib/matplotlib/cbook/deprecation.py
@@ -285,10 +285,10 @@ def func(good_name): ...
     signature = inspect.signature(func)
     assert old not in signature.parameters, (
         f"Matplotlib internal error: {old!r} cannot be a parameter for "
-        "{func.__name__}()")
+        f"{func.__name__}()")
     assert new in signature.parameters, (
         f"Matplotlib internal error: {new!r} must be a parameter for "
-        "{func.__name__}()")
+        f"{func.__name__}()")
 
     @functools.wraps(func)
     def wrapper(*args, **kwargs):
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -1693,6 +1693,17 @@ def test_hist2d_transpose():
     ax.hist2d(x, y, bins=10, rasterized=True)
 
 
+def test_hist2d_density_normed():
+    x, y = np.random.random((2, 100))
+    ax = plt.figure().subplots()
+    for obj in [ax, plt]:
+        obj.hist2d(x, y, density=True)
+        with pytest.warns(MatplotlibDeprecationWarning):
+            obj.hist2d(x, y, normed=True)
+        with pytest.warns(MatplotlibDeprecationWarning):
+            obj.hist2d(x, y, density=True, normed=True)
+
+
 class TestScatter(object):
     @image_comparison(baseline_images=['scatter'],
                       style='mpl20', remove_text=True)
