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'''Test percolator.py.'''
from test.support import requires
requires('gui')
import unittest
from tkinter import Text, Tk, END
from idlelib.percolator import Percolator, Delegator
class MyFilter(Delegator):
def __init__(self):
Delegator.__init__(self, None)
def insert(self, *args):
self.insert_called_with = args
self.delegate.insert(*args)
def delete(self, *args):
self.delete_called_with = args
self.delegate.delete(*args)
def uppercase_insert(self, index, chars, tags=None):
chars = chars.upper()
self.delegate.insert(index, chars)
def lowercase_insert(self, index, chars, tags=None):
chars = chars.lower()
self.delegate.insert(index, chars)
def dont_insert(self, index, chars, tags=None):
pass
class PercolatorTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.root = Tk()
cls.text = Text(cls.root)
@classmethod
def tearDownClass(cls):
del cls.text
cls.root.destroy()
del cls.root
def setUp(self):
self.percolator = Percolator(self.text)
self.filter_one = MyFilter()
self.filter_two = MyFilter()
self.percolator.insertfilter(self.filter_one)
self.percolator.insertfilter(self.filter_two)
def tearDown(self):
self.percolator.close()
self.text.delete('1.0', END)
def test_insertfilter(self):
self.assertIsNotNone(self.filter_one.delegate)
self.assertEqual(self.percolator.top, self.filter_two)
self.assertEqual(self.filter_two.delegate, self.filter_one)
self.assertEqual(self.filter_one.delegate, self.percolator.bottom)
def test_removefilter(self):
filter_three = MyFilter()
self.percolator.removefilter(self.filter_two)
self.assertEqual(self.percolator.top, self.filter_one)
self.assertIsNone(self.filter_two.delegate)
filter_three = MyFilter()
self.percolator.insertfilter(self.filter_two)
self.percolator.insertfilter(filter_three)
self.percolator.removefilter(self.filter_one)
self.assertEqual(self.percolator.top, filter_three)
self.assertEqual(filter_three.delegate, self.filter_two)
self.assertEqual(self.filter_two.delegate, self.percolator.bottom)
self.assertIsNone(self.filter_one.delegate)
def test_insert(self):
self.text.insert('insert', 'foo')
self.assertEqual(self.text.get('1.0', END), 'foo\n')
self.assertTupleEqual(self.filter_one.insert_called_with,
('insert', 'foo', None))
def test_modify_insert(self):
self.filter_one.insert = self.filter_one.uppercase_insert
self.text.insert('insert', 'bAr')
self.assertEqual(self.text.get('1.0', END), 'BAR\n')
def test_modify_chain_insert(self):
filter_three = MyFilter()
self.percolator.insertfilter(filter_three)
self.filter_two.insert = self.filter_two.uppercase_insert
self.filter_one.insert = self.filter_one.lowercase_insert
self.text.insert('insert', 'BaR')
self.assertEqual(self.text.get('1.0', END), 'bar\n')
def test_dont_insert(self):
self.filter_one.insert = self.filter_one.dont_insert
self.text.insert('insert', 'foo bar')
self.assertEqual(self.text.get('1.0', END), '\n')
self.filter_one.insert = self.filter_one.dont_insert
self.text.insert('insert', 'foo bar')
self.assertEqual(self.text.get('1.0', END), '\n')
def test_without_filter(self):
self.text.insert('insert', 'hello')
self.assertEqual(self.text.get('1.0', 'end'), 'hello\n')
def test_delete(self):
self.text.insert('insert', 'foo')
self.text.delete('1.0', '1.2')
self.assertEqual(self.text.get('1.0', END), 'o\n')
self.assertTupleEqual(self.filter_one.delete_called_with,
('1.0', '1.2'))
if __name__ == '__main__':
unittest.main(verbosity=2)
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