autoexpand init only needs text if mocktk text decode understood indexes insert with suffixed linestart wordstart and lineend used by autoexpand we could use the following to run these test on nongui machines but check bell try requires gui raise resourcedenied uncomment to test mock except resourcedenied from idlelib idletest mocktk import text cls text text cls text bell lambda none else from tkinter import tk text cls tk tk cls text textcls tk also add punctuation noise that should be ignored no expansion candidate found reset state by successfully expanding once move cursor to another position and expand again autoexpand __init__ only needs text if mock_tk text _decode understood indexes insert with suffixed linestart wordstart and lineend used by autoexpand we could use the following to run these test on non gui machines but check bell try requires gui raise resourcedenied uncomment to test mock except resourcedenied from idlelib idle_test mock_tk import text cls text text cls text bell lambda none else from tkinter import tk text cls tk tk cls text text cls tk also add punctuation noise that should be ignored no expansion candidate found reset state by successfully expanding once move cursor to another position and expand again
"Test autoexpand, coverage 100%."

from idlelib.autoexpand import AutoExpand
import unittest
from test.support import requires
from tkinter import Text, Tk


class DummyEditwin:
    
    def __init__(self, text):
        self.text = text

class AutoExpandTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        requires('gui')
        cls.tk = Tk()
        cls.text = Text(cls.tk)
        cls.auto_expand = AutoExpand(DummyEditwin(cls.text))
        cls.auto_expand.bell = lambda: None


    @classmethod
    def tearDownClass(cls):
        del cls.text, cls.auto_expand
        if hasattr(cls, 'tk'):
            cls.tk.destroy()
            del cls.tk

    def tearDown(self):
        self.text.delete('1.0', 'end')

    def test_get_prevword(self):
        text = self.text
        previous = self.auto_expand.getprevword
        equal = self.assertEqual

        equal(previous(), '')

        text.insert('insert', 't')
        equal(previous(), 't')

        text.insert('insert', 'his')
        equal(previous(), 'this')

        text.insert('insert', ' ')
        equal(previous(), '')

        text.insert('insert', 'is')
        equal(previous(), 'is')

        text.insert('insert', '\nsample\nstring')
        equal(previous(), 'string')

        text.delete('3.0', 'insert')
        equal(previous(), '')

        text.delete('1.0', 'end')
        equal(previous(), '')

    def test_before_only(self):
        previous = self.auto_expand.getprevword
        expand = self.auto_expand.expand_word_event
        equal = self.assertEqual

        self.text.insert('insert', 'ab ac bx ad ab a')
        equal(self.auto_expand.getwords(), ['ab', 'ad', 'ac', 'a'])
        expand('event')
        equal(previous(), 'ab')
        expand('event')
        equal(previous(), 'ad')
        expand('event')
        equal(previous(), 'ac')
        expand('event')
        equal(previous(), 'a')

    def test_after_only(self):
        
        text = self.text
        previous = self.auto_expand.getprevword
        expand = self.auto_expand.expand_word_event
        equal = self.assertEqual

        text.insert('insert', 'a, [ab] ac: () bx"" cd ac= ad ya')
        text.mark_set('insert', '1.1')
        equal(self.auto_expand.getwords(), ['ab', 'ac', 'ad', 'a'])
        expand('event')
        equal(previous(), 'ab')
        expand('event')
        equal(previous(), 'ac')
        expand('event')
        equal(previous(), 'ad')
        expand('event')
        equal(previous(), 'a')

    def test_both_before_after(self):
        text = self.text
        previous = self.auto_expand.getprevword
        expand = self.auto_expand.expand_word_event
        equal = self.assertEqual

        text.insert('insert', 'ab xy yz\n')
        text.insert('insert', 'a ac by ac')

        text.mark_set('insert', '2.1')
        equal(self.auto_expand.getwords(), ['ab', 'ac', 'a'])
        expand('event')
        equal(previous(), 'ab')
        expand('event')
        equal(previous(), 'ac')
        expand('event')
        equal(previous(), 'a')

    def test_other_expand_cases(self):
        text = self.text
        expand = self.auto_expand.expand_word_event
        equal = self.assertEqual

        
        equal(self.auto_expand.getwords(), [])
        equal(expand('event'), 'break')

        text.insert('insert', 'bx cy dz a')
        equal(self.auto_expand.getwords(), [])

        
        
        text.insert('insert', 'ac xy a ac ad a')
        text.mark_set('insert', '1.7')
        expand('event')
        initial_state = self.auto_expand.state
        text.mark_set('insert', '1.end')
        expand('event')
        new_state = self.auto_expand.state
        self.assertNotEqual(initial_state, new_state)


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