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"""Unittest for UndoDelegator in idlelib.undo.py.
Coverage about 80% (retest).
"""
from test.support import requires
requires('gui')
import unittest
from unittest.mock import Mock
from tkinter import Text, Tk
from idlelib.undo import UndoDelegator
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)