from tkinter import *
from idlelib.configdialog import ConfigDialog
from idlelib.config import IdleUserConfParser, idleConf
from idlelib.idle_test.mock_idle import Func

testcfg = {
    'main': IdleUserConfParser(''),
    'highlight': IdleUserConfParser(''),
    'keys': IdleUserConfParser(''),
    'extensions': IdleUserConfParser(''),
}
idleConf.userCfg = testcfg

root = Tk()
dialog = ConfigDialog(root, 'Test', _utest=True)
d = dialog.fontpage
dialog.note.select(d)
d.set_samples = Func()  # don't set samples
d.update()

fontlist = d.fontlist

while True:
    fontlist.activate(0)
    font = d.fontlist.get('active')
    try:
        i = 0
        while True:
            # Test Down key.
            fontlist.focus_force()
            fontlist.update()
            fontlist.event_generate('<Key-Down>')
            fontlist.event_generate('<KeyRelease-Down>')

            down_font = fontlist.get('active')
            assert down_font != font, 'down font'
            assert d.font_name.get() in down_font.lower(), 'down name'

            # Test Up key.
            fontlist.focus_force()
            fontlist.update()
            fontlist.event_generate('<Key-Up>')
            fontlist.event_generate('<KeyRelease-Up>')

            up_font = fontlist.get('active')
            assert up_font == font, 'up font'
            assert d.font_name.get() in up_font.lower(), 'up name'
            i += 1
            if not i % 1000:
                print(i)
    except AssertionError as e:
        print(i, e)