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venv/lib/python3.9/site-packages/twisted/conch/test/test_window.py

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+
+"""
+Tests for the insults windowing module, L{twisted.conch.insults.window}.
+"""
+
+from twisted.trial.unittest import TestCase
+
+from twisted.conch.insults.window import TopWindow, ScrolledArea, TextOutput
+
+
+class TopWindowTests(TestCase):
+    """
+    Tests for L{TopWindow}, the root window container class.
+    """
+
+    def test_paintScheduling(self):
+        """
+        Verify that L{TopWindow.repaint} schedules an actual paint to occur
+        using the scheduling object passed to its initializer.
+        """
+        paints = []
+        scheduled = []
+        root = TopWindow(lambda: paints.append(None), scheduled.append)
+
+        # Nothing should have happened yet.
+        self.assertEqual(paints, [])
+        self.assertEqual(scheduled, [])
+
+        # Cause a paint to be scheduled.
+        root.repaint()
+        self.assertEqual(paints, [])
+        self.assertEqual(len(scheduled), 1)
+
+        # Do another one to verify nothing else happens as long as the previous
+        # one is still pending.
+        root.repaint()
+        self.assertEqual(paints, [])
+        self.assertEqual(len(scheduled), 1)
+
+        # Run the actual paint call.
+        scheduled.pop()()
+        self.assertEqual(len(paints), 1)
+        self.assertEqual(scheduled, [])
+
+        # Do one more to verify that now that the previous one is finished
+        # future paints will succeed.
+        root.repaint()
+        self.assertEqual(len(paints), 1)
+        self.assertEqual(len(scheduled), 1)
+
+
+
+class ScrolledAreaTests(TestCase):
+    """
+    Tests for L{ScrolledArea}, a widget which creates a viewport containing
+    another widget and can reposition that viewport using scrollbars.
+    """
+    def test_parent(self):
+        """
+        The parent of the widget passed to L{ScrolledArea} is set to a new
+        L{Viewport} created by the L{ScrolledArea} which itself has the
+        L{ScrolledArea} instance as its parent.
+        """
+        widget = TextOutput()
+        scrolled = ScrolledArea(widget)
+        self.assertIs(widget.parent, scrolled._viewport)
+        self.assertIs(scrolled._viewport.parent, scrolled)