diff --git a/skimage/_shared/testing.py b/skimage/_shared/testing.py
index 1b653272..7712c0ae 100644
--- a/skimage/_shared/testing.py
+++ b/skimage/_shared/testing.py
@@ -179,9 +179,11 @@ def mono_check(plugin, fmt='png'):
 
 
 def setup_test():
-   from scipy import signal, ndimage, special, optimize, linalg
-   from skimage import filter, viewer
    warnings.simplefilter('error')
+   with all_warnings():
+       from scipy import signal, ndimage, special, optimize, linalg
+       from skimage import filter, viewer, data
+       data.moon()
 
 
 if __name__ == '__main__':
diff --git a/skimage/io/_plugins/pil_plugin.py b/skimage/io/_plugins/pil_plugin.py
index f1d74e22..05b8b9cb 100644
--- a/skimage/io/_plugins/pil_plugin.py
+++ b/skimage/io/_plugins/pil_plugin.py
@@ -180,7 +180,10 @@ def ndarray_to_pil(arr, format_str=None):
 
     if arr.ndim == 2:
         im = Image.new(mode_base, arr.T.shape)
-        im.frombytes(arr.tobytes(), 'raw', mode)
+        try:
+            im.frombytes(arr.tobytes(), 'raw', mode)
+        except AttributeError:
+            im.frombytes(arr.tostring(), 'raw', mode)
 
     else:
         try:
@@ -188,7 +191,7 @@ def ndarray_to_pil(arr, format_str=None):
                                  arr.tobytes())
         except AttributeError:
             im = Image.frombytes(mode, (arr.shape[1], arr.shape[0]),
-                                  arr.tobytes())
+                                  arr.tostring())
     return im
 
 
diff --git a/skimage/measure/_regionprops.py b/skimage/measure/_regionprops.py
index 2ecbf67f..cf2bfc41 100644
--- a/skimage/measure/_regionprops.py
+++ b/skimage/measure/_regionprops.py
@@ -475,9 +475,11 @@ def regionprops(label_image, intensity_image=None, cache=True):
     >>> img = util.img_as_ubyte(data.coins()) > 110
     >>> label_img = label(img)  # doctest: +SKIP
     >>> props = regionprops(label_img)  # doctest: +SKIP
-    >>> props[0].centroid   # doctest: +SKIP centroid of first labeled object
+    >>> # centroid of first labeled object
+    >>> props[0].centroid   # doctest: +SKIP 
     (22.729879860483141, 81.912285234465827)
-    >>> props[0]['centroid']  # doctest: +SKIP centroid of first labeled object
+    >>> # centroid of first labeled object
+    >>> props[0]['centroid']  # doctest: +SKIP 
     (22.729879860483141, 81.912285234465827)
 
     """