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venv/lib/python3.9/site-packages/ipywidgets/widgets/tests/test_link.py

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+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import pytest
+
+from .. import jslink, jsdlink, ToggleButton
+
+def test_jslink_args():
+    with pytest.raises(TypeError):
+        jslink()
+    w1 = ToggleButton()
+    with pytest.raises(TypeError):
+        jslink((w1, 'value'))
+
+    w2 = ToggleButton()
+    jslink((w1, 'value'), (w2, 'value'))
+
+    with pytest.raises(TypeError):
+        jslink((w1, 'value'), (w2, 'nosuchtrait'))
+
+    with pytest.raises(TypeError):
+        jslink((w1, 'value'), (w2, 'traits'))
+
+def test_jsdlink_args():
+    with pytest.raises(TypeError):
+        jsdlink()
+    w1 = ToggleButton()
+    with pytest.raises(TypeError):
+        jsdlink((w1, 'value'))
+
+    w2 = ToggleButton()
+    jsdlink((w1, 'value'), (w2, 'value'))
+
+    with pytest.raises(TypeError):
+        jsdlink((w1, 'value'), (w2, 'nosuchtrait'))
+
+    with pytest.raises(TypeError):
+        jsdlink((w1, 'value'), (w2, 'traits'))