Uploaded Test files

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

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+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import inspect
+import warnings
+from unittest import TestCase
+
+from traitlets import TraitError
+
+from ipywidgets import Dropdown, SelectionSlider, Select
+
+
+class TestDropdown(TestCase):
+
+    def test_construction(self):
+        Dropdown()
+
+    def test_deprecation_warning_mapping_options(self):
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+
+            # Clearing the internal __warningregistry__ seems to be required for
+            # Python 2 (but not for Python 3)
+            module = inspect.getmodule(Dropdown)
+            getattr(module, '__warningregistry__', {}).clear()
+
+            Dropdown(options={'One': 1, 'Two': 2, 'Three': 3})
+            assert len(w) > 0
+            assert issubclass(w[-1].category, DeprecationWarning)
+            assert "Support for mapping types has been deprecated" in str(w[-1].message)
+
+
+class TestSelectionSlider(TestCase):
+
+    def test_construction(self):
+        SelectionSlider(options=['a', 'b', 'c'])
+
+    def test_index_trigger(self):
+        slider = SelectionSlider(options=['a', 'b', 'c'])
+        observations = []
+        def f(change):
+            observations.append(change.new)
+        slider.observe(f, 'index')
+        assert slider.index == 0
+        slider.options = [4, 5, 6]
+        assert slider.index == 0
+        assert slider.value == 4
+        assert slider.label == '4'
+        assert observations == [0]
+
+class TestSelection(TestCase):
+
+    def test_construction(self):
+        select = Select(options=['a', 'b', 'c'])
+
+    def test_index_trigger(self):
+        select = Select(options=[1, 2, 3])
+        observations = []
+        def f(change):
+            observations.append(change.new)
+        select.observe(f, 'index')
+        assert select.index == 0
+        select.options = [4, 5, 6]
+        assert select.index == 0
+        assert select.value == 4
+        assert select.label == '4'
+        assert observations == [0]
+
+    def test_duplicate(self):
+        select = Select(options=['first', 1, 'dup', 'dup'])
+        observations = []
+        def f(change):
+            observations.append(change.new)
+        select.observe(f, 'index')
+        select.index = 3
+        assert select.index == 3
+        assert select.value == 'dup'
+        assert select.label == 'dup'
+        assert observations == [3]
+        select.index = 2
+        assert select.index == 2
+        assert select.value == 'dup'
+        assert select.label == 'dup'
+        assert observations == [3, 2]
+        select.index = 0
+        assert select.index == 0
+        assert select.value == 'first'
+        assert select.label == 'first'
+        assert observations == [3, 2, 0]
+
+        # picks the first matching value
+        select.value = 'dup'
+        assert select.index == 2
+        assert select.value == 'dup'
+        assert select.label == 'dup'
+        assert observations == [3, 2, 0, 2]