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__pycache__	[ DIR ]	drwxr-sr-x	2025-06-04 09:23
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__init__.py	712 B	-rw-r--r--	2025-06-04 09:23
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mock_idle.py	1.9 KB	-rw-r--r--	2025-06-04 09:23
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tkinter_testing_utils.py	2.28 KB	-rw-r--r--	2025-06-04 09:23

Rename

"Test undo, coverage 77%."
# Only test UndoDelegator so far.

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):
        """
        Dump_event cannot be tested directly without changing
        environment variables. So, test statements in dump_event
        indirectly
        """
        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):
        # test the getter method get_saved
        # test the setter method set_saved
        # indirectly test check_saved
        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):
        # test the undo_block_start and undo_block_stop methods
        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')

# test another code path
        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
        # when number of undo operations exceeds max_undo
        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)