only test undodelegator so far dumpevent cannot be tested directly without changing environment variables so test statements in dumpevent indirectly test the getter method getsaved test the setter method setsaved indirectly test checksaved test the undoblockstart and undoblockstop methods test another code path when number of undo operations exceeds maxundo only test undodelegator so far dump_event cannot be tested directly without changing environment variables so test statements in dump_event indirectly test the getter method get_saved test the setter method set_saved indirectly test check_saved test the undo_block_start and undo_block_stop methods test another code path when number of undo operations exceeds max_undo
"Test undo, coverage 77%."


from idlelib.undo import UndoDelegator
import unittest
from test.support import requires
requires('gui')

from unittest.mock import Mock
from tkinter import Text, Tk
from idlelib.percolator import Percolator


class UndoDelegatorTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.root = Tk()
        cls.text = Text(cls.root)
        cls.percolator = Percolator(cls.text)

    @classmethod
    def tearDownClass(cls):
        cls.percolator.redir.close()
        del cls.percolator, cls.text
        cls.root.destroy()
        del cls.root

    def setUp(self):
        self.delegator = UndoDelegator()
        self.delegator.bell = Mock()
        self.percolator.insertfilter(self.delegator)

    def tearDown(self):
        self.percolator.removefilter(self.delegator)
        self.text.delete('1.0', 'end')
        self.delegator.resetcache()

    def test_undo_event(self):
        text = self.text

        text.insert('insert', 'foobar')
        text.insert('insert', 'h')
        text.event_generate('<<undo>>')
        self.assertEqual(text.get('1.0', 'end'), '\n')

        text.insert('insert', 'foo')
        text.insert('insert', 'bar')
        text.delete('1.2', '1.4')
        text.insert('insert', 'hello')
        text.event_generate('<<undo>>')
        self.assertEqual(text.get('1.0', '1.4'), 'foar')
        text.event_generate('<<undo>>')
        self.assertEqual(text.get('1.0', '1.6'), 'foobar')
        text.event_generate('<<undo>>')
        self.assertEqual(text.get('1.0', '1.3'), 'foo')
        text.event_generate('<<undo>>')
        self.delegator.undo_event('event')
        self.assertTrue(self.delegator.bell.called)

    def test_redo_event(self):
        text = self.text

        text.insert('insert', 'foo')
        text.insert('insert', 'bar')
        text.delete('1.0', '1.3')
        text.event_generate('<<undo>>')
        text.event_generate('<<redo>>')
        self.assertEqual(text.get('1.0', '1.3'), 'bar')
        text.event_generate('<<redo>>')
        self.assertTrue(self.delegator.bell.called)

    def test_dump_event(self):
        
        text = self.text
        d = self.delegator

        text.insert('insert', 'foo')
        text.insert('insert', 'bar')
        text.delete('1.2', '1.4')
        self.assertTupleEqual((d.pointer, d.can_merge), (3, True))
        text.event_generate('<<undo>>')
        self.assertTupleEqual((d.pointer, d.can_merge), (2, False))

    def test_get_set_saved(self):
        
        
        
        d = self.delegator

        self.assertTrue(d.get_saved())
        self.text.insert('insert', 'a')
        self.assertFalse(d.get_saved())
        d.saved_change_hook = Mock()

        d.set_saved(True)
        self.assertEqual(d.pointer, d.saved)
        self.assertTrue(d.saved_change_hook.called)

        d.set_saved(False)
        self.assertEqual(d.saved, -1)
        self.assertTrue(d.saved_change_hook.called)

    def test_undo_start_stop(self):
        
        text = self.text

        text.insert('insert', 'foo')
        self.delegator.undo_block_start()
        text.insert('insert', 'bar')
        text.insert('insert', 'bar')
        self.delegator.undo_block_stop()
        self.assertEqual(text.get('1.0', '1.3'), 'foo')

        
        self.delegator.undo_block_start()
        text.insert('insert', 'bar')
        self.delegator.undo_block_stop()
        self.assertEqual(text.get('1.0', '1.3'), 'foo')

    def test_addcmd(self):
        text = self.text
        
        self.delegator.max_undo = max_undo = 10
        for i in range(max_undo + 10):
            text.insert('insert', 'foo')
            self.assertLessEqual(len(self.delegator.undolist), max_undo)


if __name__ == '__main__':
    unittest.main(verbosity=2, exit=False)