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"""
Tests for the insults windowing module, L{twisted.conch.insults.window}.
"""

from twisted.conch.insults.window import ScrolledArea, TextOutput, TopWindow
from twisted.trial.unittest import TestCase


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{Scroll