Add tests for deprecation warnings and the deprecation function

Author: jasongrout

python/ipywidgets/ipywidgets/widgets/tests/test_button.py

@@ -0,0 +1,9 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import pytest
+from ipywidgets import Button
+
+def test_deprecation_fa_icons():
+    with pytest.deprecated_call():
+        Button(icon='fa-home')

python/ipywidgets/ipywidgets/widgets/tests/test_utils.py

@@ -0,0 +1,17 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import pytest
+
+from ..utils import deprecation
+
+def test_deprecation():
+    with pytest.deprecated_call() as w:
+        deprecation('Deprecated call')
+        # Make sure the deprecation pointed to the external function calling this test function
+        assert w[0].filename.endswith('_pytest/python.py')
+
+    with pytest.deprecated_call() as w:
+        deprecation('Deprecated call', ['ipywidgets/widgets/tests'])
+        # Make sure the deprecation pointed to the external function calling this test function
+        assert w[0].filename.endswith('_pytest/python.py')

python/ipywidgets/ipywidgets/widgets/tests/test_widget_string.py

@@ -1,7 +1,8 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-from ..widget_string import Combobox
+from ..widget_string import Combobox, Text
+import pytest
 
 
 def test_combobox_creation_blank():
@@ -32,3 +33,19 @@ def test_combobox_creation_kwargs():
             "Vanilla",
         )
     assert w.ensure_option == True
+
+def test_deprecation_description_tooltip():
+    with pytest.deprecated_call():
+        Text(description_tooltip='tooltip')
+
+    with pytest.deprecated_call():
+        Text().description_tooltip
+
+
+    with pytest.deprecated_call():
+        Text().description_tooltip = 'tooltip'
+
+
+def test_deprecation_on_submit():
+    with pytest.deprecated_call():
+        Text().on_submit(lambda *args: ...)