Bump length of image widget repr, and fix test

Author: jasongrout

ipywidgets/widgets/tests/test_widget_image.py

@@ -149,8 +149,9 @@ def test_value_repr_length():
     with get_logo_png() as LOGO_PNG:
         with open(LOGO_PNG, 'rb') as f:
             img = Image.from_file(f)
-            assert len(img.__repr__()) < 120
-            assert img.__repr__().endswith("...')")
+            assert len(img.__repr__()) < 140
+            assert img.__repr__().endswith(")")
+            assert img.__repr__()[-5:-2] == '...'
 
 
 def test_value_repr_url():

ipywidgets/widgets/widget_media.py

@@ -117,8 +117,8 @@ def _get_repr(self, cls):
         # Return value first like a ValueWidget
         signature = []
 
-        sig_value = 'value={!r}'.format(self.value[:30].tobytes())
-        if self.value.nbytes > 30:
+        sig_value = 'value={!r}'.format(self.value[:40].tobytes())
+        if self.value.nbytes > 40:
             sig_value = sig_value[:-1]+"..."+sig_value[-1]
         signature.append(sig_value)