diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index 7fec6081f405..4aa6f667a93c 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -2130,6 +2130,8 @@ def print_figure(self, filename, dpi=None, facecolor=None, edgecolor=None,
 
         if format is None:
             # get format from filename, or from backend's default filetype
+            if isinstance(filename, getattr(os, "PathLike", ())):
+                filename = os.fspath(filename)
             if isinstance(filename, six.string_types):
                 format = os.path.splitext(filename)[1][1:]
             if format is None or format == '':
diff --git a/lib/matplotlib/tests/baseline_images/test_widgets/check_bunch_of_radio_buttons.png b/lib/matplotlib/tests/baseline_images/test_widgets/check_bunch_of_radio_buttons.png
new file mode 100644
index 000000000000..0c09959a0358
Binary files /dev/null and b/lib/matplotlib/tests/baseline_images/test_widgets/check_bunch_of_radio_buttons.png differ
diff --git a/lib/matplotlib/tests/baseline_images/test_widgets/check_radio_buttons.png b/lib/matplotlib/tests/baseline_images/test_widgets/check_radio_buttons.png
index c1ed74347bfe..0b83eb7d5ace 100644
Binary files a/lib/matplotlib/tests/baseline_images/test_widgets/check_radio_buttons.png and b/lib/matplotlib/tests/baseline_images/test_widgets/check_radio_buttons.png differ
diff --git a/lib/matplotlib/tests/test_figure.py b/lib/matplotlib/tests/test_figure.py
index 93d2639056ac..229ce192cc75 100644
--- a/lib/matplotlib/tests/test_figure.py
+++ b/lib/matplotlib/tests/test_figure.py
@@ -1,6 +1,5 @@
 from __future__ import absolute_import, division, print_function
 
-import os
 import sys
 import warnings
 
@@ -379,6 +378,11 @@ def test_figure_repr():
 
 @pytest.mark.skipif(sys.version_info < (3, 6), reason="requires Python 3.6+")
 @pytest.mark.parametrize("fmt", ["png", "pdf", "ps", "eps", "svg"])
-def test_fspath(fmt):
+def test_fspath(fmt, tmpdir):
     from pathlib import Path
-    plt.savefig(Path(os.devnull), format=fmt)
+    out = Path(tmpdir, "test.{}".format(fmt))
+    plt.savefig(out)
+    with out.open("rb") as file:
+        # All the supported formats include the format name (case-insensitive)
+        # in the first 100 bytes.
+        assert fmt.encode("ascii") in file.read(100).lower()
diff --git a/lib/matplotlib/tests/test_widgets.py b/lib/matplotlib/tests/test_widgets.py
index afd50ef24e3c..70e7b55080ab 100644
--- a/lib/matplotlib/tests/test_widgets.py
+++ b/lib/matplotlib/tests/test_widgets.py
@@ -260,8 +260,7 @@ def test_CheckButtons():
     check.disconnect(cid)
 
 
-@image_comparison(baseline_images=['check_radio_buttons'], extensions=['png'],
-                  style='default')
+@image_comparison(baseline_images=['check_radio_buttons'], extensions=['png'])
 def test_check_radio_buttons_image():
     get_ax()
     plt.subplots_adjust(left=0.3)
@@ -271,6 +270,10 @@ def test_check_radio_buttons_image():
     widgets.CheckButtons(rax2, ('Check 1', 'Check 2', 'Check 3'),
                          (False, True, True))
 
+@image_comparison(baseline_images=['check_bunch_of_radio_buttons'], extensions=['png'])
+def test_check_bunch_of_radio_buttons():
+    rax = plt.axes([0.05, 0.1, 0.15, 0.7])
+    widgets.RadioButtons(rax, ('B1', 'B2', 'B3', 'B4', 'B5','B6', 'B7', 'B8', 'B9', 'B10', 'B11', 'B12', 'B13', 'B14', 'B15'))
 
 def test_slider_slidermin_slidermax_invalid():
     fig, ax = plt.subplots()