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.venv/Lib/site-packages/ipywidgets/widgets/tests/test_widget.py

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+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+"""Test Widget."""
+
+from IPython.core.interactiveshell import InteractiveShell
+from IPython.display import display
+from IPython.utils.capture import capture_output
+
+from ..widget import Widget
+from ..widget_button import Button
+
+
+def test_no_widget_view():
+    # ensure IPython shell is instantiated
+    # otherwise display() just calls print
+    shell = InteractiveShell.instance()
+
+    with capture_output() as cap:
+        w = Widget()
+        display(w)
+
+    assert len(cap.outputs) == 1, "expect 1 output"
+    mime_bundle = cap.outputs[0].data
+    assert mime_bundle['text/plain'] == repr(w), "expected plain text output"
+    assert 'application/vnd.jupyter.widget-view+json' not in mime_bundle, "widget has no view"
+    assert cap.stdout == '', repr(cap.stdout)
+    assert cap.stderr == '', repr(cap.stderr)
+
+
+def test_widget_view():
+    # ensure IPython shell is instantiated
+    # otherwise display() just calls print
+    shell = InteractiveShell.instance()
+
+    with capture_output() as cap:
+        w = Button()
+        display(w)
+
+    assert len(cap.outputs) == 1, "expect 1 output"
+    mime_bundle = cap.outputs[0].data
+    assert mime_bundle['text/plain'] == repr(w), "expected plain text output"
+    assert 'application/vnd.jupyter.widget-view+json' in mime_bundle, "widget should have have a view"
+    assert cap.stdout == '', repr(cap.stdout)
+    assert cap.stderr == '', repr(cap.stderr)