diff --git a/python/ipywidgets/ipywidgets/widgets/tests/utils.py b/python/ipywidgets/ipywidgets/widgets/tests/utils.py
index d3d7016b6a..f382742fd4 100644
--- a/python/ipywidgets/ipywidgets/widgets/tests/utils.py
+++ b/python/ipywidgets/ipywidgets/widgets/tests/utils.py
@@ -1,7 +1,6 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-import pytest
 
 from ipywidgets import Widget
 import ipywidgets.widgets.widget
@@ -105,12 +104,3 @@ def setup():
 
 def call_method(method, *args, **kwargs):
     method(*args, **kwargs)
-
-
-@pytest.fixture
-def dummy_comm_fixture():
-    setup()
-    try:
-        yield
-    finally:
-        teardown_test_comm()
diff --git a/python/ipywidgets/ipywidgets/widgets/widget_box.py b/python/ipywidgets/ipywidgets/widgets/widget_box.py
index 598bb40ef2..50804bb28c 100644
--- a/python/ipywidgets/ipywidgets/widgets/widget_box.py
+++ b/python/ipywidgets/ipywidgets/widgets/widget_box.py
@@ -77,8 +77,7 @@ class Box(DOMWidget, CoreWidget):
     >>> widgets.Box([title_widget, slider])
     """
     _model_name = Unicode('BoxModel').tag(sync=True)
-    _view_name = Unicode('BoxView').tag(sync=True)
-    tooltip = Unicode('', allow_none=True, help='A tooltip caption.').tag(sync=True)
+    _view_name = Unicode("BoxView").tag(sync=True)
     validate_mode = CaselessStrEnum(['raise', 'log_warning', 'log_error'], 'raise')
 
     # Child widgets in the container.
diff --git a/python/ipywidgets/ipywidgets/widgets/widget_output.py b/python/ipywidgets/ipywidgets/widgets/widget_output.py
index c8729d9fed..150ac93471 100644
--- a/python/ipywidgets/ipywidgets/widgets/widget_output.py
+++ b/python/ipywidgets/ipywidgets/widgets/widget_output.py
@@ -59,7 +59,6 @@ def func():
 
     msg_id = Unicode('', help="Parent message id of messages to capture").tag(sync=True)
     outputs = TypedTuple(trait=Dict(), help="The output messages synced from the frontend.").tag(sync=True)
-    tooltip = Unicode('', allow_none=True, help="A tooltip caption.").tag(sync=True)
 
     __counter = 0