[core/widget] Add widget class

To maintain backwards compatibility (and because I think it's an OK
design choice), keep the widget concept (a single module can produce
multiple widgets).

tests/core/test_widget.py

@@ -0,0 +1,38 @@
+import unittest
+import unittest.mock
+
+import core.widget
+
+class widget(unittest.TestCase):
+    def setUp(self):
+        self.someValue = 'some random value'
+        self.someOtherValue = 'some different value'
+        self.callbackReturnValue = 'callback return value'
+        self.someWidget = core.widget.Widget(full_text=self.someValue)
+        self.someCallback = unittest.mock.MagicMock(return_value=self.callbackReturnValue)
+
+        self.assertNotEqual(self.someValue, self.someOtherValue)
+
+    def tearDown(self):
+        pass
+
+    def test_text_fulltext(self):
+        newWidget = core.widget.Widget(full_text=self.someValue)
+        self.assertEqual(self.someValue, newWidget.full_text())
+
+    def test_set_fulltext(self):
+        self.assertNotEqual(self.someOtherValue, self.someWidget.full_text())
+        self.someWidget.full_text(self.someOtherValue)
+        self.assertEqual(self.someOtherValue, self.someWidget.full_text())
+
+    def test_callable_fulltext(self):
+        newWidget = core.widget.Widget(full_text=self.someCallback)
+        self.assertEqual(newWidget.full_text(), self.callbackReturnValue)
+        self.someCallback.assert_called_once()
+
+    def test_set_callable_fulltext(self):
+        self.someWidget.full_text(self.someCallback)
+        self.assertEqual(self.someWidget.full_text(), self.callbackReturnValue)
+        self.someCallback.assert_called_once()
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4