input-remapper/tests/testcases/test_keycode_mapper.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
# key-mapper - GUI for device specific keyboard mappings
# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
#
# This file is part of key-mapper.
#
# key-mapper is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# key-mapper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with key-mapper.  If not, see <https://www.gnu.org/licenses/>.


import unittest
import asyncio
import time

from evdev.ecodes import EV_KEY, EV_ABS, ABS_HAT0X, ABS_HAT0Y, KEY_A, ABS_X, \
    EV_REL, REL_X, BTN_TL

from keymapper.dev.keycode_mapper import should_map_event_as_btn, \
    active_macros, handle_keycode
from keymapper.state import system_mapping
from keymapper.dev.macros import parse
from keymapper.config import config
from keymapper.mapping import Mapping

from tests.test import InputEvent, UInput, uinput_write_history, \
    clear_write_history


def wait(func, timeout=1.0):
    """Wait for func to return True."""
    iterations = 0
    sleepytime = 0.1
    while not func():
        time.sleep(sleepytime)
        iterations += 1
        if iterations * sleepytime > timeout:
            raise Exception('Timeout')


def calculate_event_number(holdtime, before, after):
    """
    Parameters
    ----------
    holdtime : int
        in ms, how long was the key held down
    before : int
        how many extra k() calls are executed before h()
    after : int
        how many extra k() calls are executed after h()
    """
    keystroke_sleep = config.get('macros.keystroke_sleep_ms', 10)
    # down and up: two sleeps per k
    # one initial k(a):
    events = before * 2
    holdtime -= keystroke_sleep * 2
    # hold events
    events += (holdtime / (keystroke_sleep * 2)) * 2
    # one trailing k(c)
    events += after * 2
    return events


class TestKeycodeMapper(unittest.TestCase):
    def setUp(self):
        self.mapping = Mapping()

    def tearDown(self):
        system_mapping.populate()

        # make sure all macros are stopped by tests
        for macro in active_macros.values():
            if macro.holding:
                macro.release_key()
            self.assertFalse(macro.holding)
            self.assertFalse(macro.running)

        keys = list(active_macros.keys())
        for key in keys:
            del active_macros[key]

        clear_write_history()

    def test_d_pad(self):
        ev_1 = (EV_ABS, ABS_HAT0X, 1)
        ev_2 = (EV_ABS, ABS_HAT0X, -1)
        ev_3 = (EV_ABS, ABS_HAT0X, 0)

        ev_4 = (EV_ABS, ABS_HAT0Y, 1)
        ev_5 = (EV_ABS, ABS_HAT0Y, -1)
        ev_6 = (EV_ABS, ABS_HAT0Y, 0)

        _key_to_code = {
            ev_1: 51,
            ev_2: 52,
            ev_4: 54,
            ev_5: 55,
        }

        uinput = UInput()
        # a bunch of d-pad key down events at once
        handle_keycode(_key_to_code, {}, InputEvent(*ev_1), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_4), uinput)

        # release all of them
        handle_keycode(_key_to_code, {}, InputEvent(*ev_3), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_6), uinput)

        # repeat with other values
        handle_keycode(_key_to_code, {}, InputEvent(*ev_2), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_5), uinput)

        # release all of them again
        handle_keycode(_key_to_code, {}, InputEvent(*ev_3), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_6), uinput)

        self.assertEqual(len(uinput_write_history), 8)

        self.assertEqual(uinput_write_history[0].t, (EV_KEY, 51, 1))
        self.assertEqual(uinput_write_history[1].t, (EV_KEY, 54, 1))

        self.assertEqual(uinput_write_history[2].t, (EV_KEY, 51, 0))
        self.assertEqual(uinput_write_history[3].t, (EV_KEY, 54, 0))

        self.assertEqual(uinput_write_history[4].t, (EV_KEY, 52, 1))
        self.assertEqual(uinput_write_history[5].t, (EV_KEY, 55, 1))

        self.assertEqual(uinput_write_history[6].t, (EV_KEY, 52, 0))
        self.assertEqual(uinput_write_history[7].t, (EV_KEY, 55, 0))

    def test_should_map_event_as_btn(self):
        self.assertTrue(should_map_event_as_btn(EV_ABS, ABS_HAT0X))
        self.assertTrue(should_map_event_as_btn(EV_KEY, KEY_A))
        self.assertFalse(should_map_event_as_btn(EV_ABS, ABS_X))
        self.assertFalse(should_map_event_as_btn(EV_REL, REL_X))

    def test_handle_keycode(self):
        _key_to_code = {
            (EV_KEY, 1, 1): 101,
            (EV_KEY, 2, 1): 102
        }

        uinput = UInput()
        handle_keycode(_key_to_code, {}, InputEvent(EV_KEY, 1, 1), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(EV_KEY, 3, 1), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(EV_KEY, 2, 1), uinput)

        self.assertEqual(len(uinput_write_history), 3)
        self.assertEqual(uinput_write_history[0].t, (EV_KEY, 101, 1))
        self.assertEqual(uinput_write_history[1].t, (EV_KEY, 3, 1))
        self.assertEqual(uinput_write_history[2].t, (EV_KEY, 102, 1))

    def test_handle_keycode_macro(self):
        history = []

        code_a = 100
        code_b = 101
        system_mapping.clear()
        system_mapping._set('a', code_a)
        system_mapping._set('b', code_b)

        macro_mapping = {
            (EV_KEY, 1, 1): parse('k(a)', self.mapping),
            (EV_KEY, 2, 1): parse('r(5, k(b))', self.mapping)
        }

        macro_mapping[(EV_KEY, 1, 1)].set_handler(lambda *args: history.append(args))
        macro_mapping[(EV_KEY, 2, 1)].set_handler(lambda *args: history.append(args))

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 1), None)
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 2, 1), None)

        loop = asyncio.get_event_loop()

        sleeptime = config.get('macros.keystroke_sleep_ms', 10) * 12

        # let the mainloop run for some time so that the macro does its stuff
        loop.run_until_complete(asyncio.sleep(sleeptime / 1000 + 0.1))

        # 6 keycodes written, with down and up events
        self.assertEqual(len(history), 12)
        self.assertIn((code_a, 1), history)
        self.assertIn((code_a, 0), history)
        self.assertIn((code_b, 1), history)
        self.assertIn((code_b, 0), history)

    def test_hold(self):
        history = []

        code_a = 100
        code_b = 101
        code_c = 102
        system_mapping.clear()
        system_mapping._set('a', code_a)
        system_mapping._set('b', code_b)
        system_mapping._set('c', code_c)

        macro_mapping = {
            (EV_KEY, 1, 1): parse('k(a).h(k(b)).k(c)', self.mapping)
        }

        def handler(*args):
            history.append(args)

        macro_mapping[(EV_KEY, 1, 1)].set_handler(handler)

        """start macro"""

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 1), None)

        loop = asyncio.get_event_loop()

        # let the mainloop run for some time so that the macro does its stuff
        sleeptime = 500
        keystroke_sleep = config.get('macros.keystroke_sleep_ms', 10)
        loop.run_until_complete(asyncio.sleep(sleeptime / 1000))

        self.assertTrue(active_macros[(EV_KEY, 1)].holding)
        self.assertTrue(active_macros[(EV_KEY, 1)].running)

        """stop macro"""

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 0), None)

        loop.run_until_complete(asyncio.sleep(keystroke_sleep * 10 / 1000))

        events = calculate_event_number(sleeptime, 1, 1)

        self.assertGreater(len(history), events * 0.9)
        self.assertLess(len(history), events * 1.1)

        self.assertIn((code_a, 1), history)
        self.assertIn((code_a, 0), history)
        self.assertIn((code_b, 1), history)
        self.assertIn((code_b, 0), history)
        self.assertIn((code_c, 1), history)
        self.assertIn((code_c, 0), history)
        self.assertGreater(history.count((code_b, 1)), 1)
        self.assertGreater(history.count((code_b, 0)), 1)

        # it's stopped and won't write stuff anymore
        count_before = len(history)
        loop.run_until_complete(asyncio.sleep(0.2))
        count_after = len(history)
        self.assertEqual(count_before, count_after)

        self.assertFalse(active_macros[(EV_KEY, 1)].holding)
        self.assertFalse(active_macros[(EV_KEY, 1)].running)

    def test_hold_2(self):
        # test irregular input patterns
        code_a = 100
        code_b = 101
        code_c = 102
        code_d = 103
        system_mapping.clear()
        system_mapping._set('a', code_a)
        system_mapping._set('b', code_b)
        system_mapping._set('c', code_c)
        system_mapping._set('d', code_d)

        macro_mapping = {
            (EV_KEY, 1, 1): parse('h(k(b))', self.mapping),
            (EV_KEY, 2, 1): parse('k(c).r(1, r(1, r(1, h(k(a))))).k(d)', self.mapping),
            (EV_KEY, 3, 1): parse('h(k(b))', self.mapping)
        }

        history = []

        def handler(*args):
            history.append(args)

        macro_mapping[(EV_KEY, 1, 1)].set_handler(handler)
        macro_mapping[(EV_KEY, 2, 1)].set_handler(handler)
        macro_mapping[(EV_KEY, 3, 1)].set_handler(handler)

        """start macro 2"""

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 2, 1), None)
        loop = asyncio.get_event_loop()

        loop.run_until_complete(asyncio.sleep(0.1))
        # starting code_c written
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)

        # spam garbage events
        for _ in range(5):
            handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 1), None)
            handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 3, 1), None)
            loop.run_until_complete(asyncio.sleep(0.05))
            self.assertTrue(active_macros[(EV_KEY, 1)].holding)
            self.assertTrue(active_macros[(EV_KEY, 1)].running)
            self.assertTrue(active_macros[(EV_KEY, 2)].holding)
            self.assertTrue(active_macros[(EV_KEY, 2)].running)
            self.assertTrue(active_macros[(EV_KEY, 3)].holding)
            self.assertTrue(active_macros[(EV_KEY, 3)].running)

        # there should only be one code_c in the events, because no key
        # up event was ever done so the hold just continued
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)
        # without an key up event on 2, it won't write code_d
        self.assertNotIn((code_d, 1), history)
        self.assertNotIn((code_d, 0), history)

        # stop macro 2
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 2, 0), None)
        loop.run_until_complete(asyncio.sleep(0.1))

        # it stopped and didn't restart, so the count stays at 1
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)
        # and the trailing d was written
        self.assertEqual(history.count((code_d, 1)), 1)
        self.assertEqual(history.count((code_d, 0)), 1)

        # it's stopped and won't write stuff anymore
        count_before = history.count((code_a, 1))
        self.assertGreater(count_before, 1)
        loop.run_until_complete(asyncio.sleep(0.1))
        count_after = history.count((code_a, 1))
        self.assertEqual(count_before, count_after)

        """restart macro 2"""

        history = []

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 2, 1), None)
        loop.run_until_complete(asyncio.sleep(0.1))
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)

        # spam garbage events again, this time key-up events on all other
        # macros
        for _ in range(5):
            handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 0), None)
            handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 3, 0), None)
            loop.run_until_complete(asyncio.sleep(0.05))
            self.assertFalse(active_macros[(EV_KEY, 1)].holding)
            self.assertFalse(active_macros[(EV_KEY, 1)].running)
            self.assertTrue(active_macros[(EV_KEY, 2)].holding)
            self.assertTrue(active_macros[(EV_KEY, 2)].running)
            self.assertFalse(active_macros[(EV_KEY, 3)].holding)
            self.assertFalse(active_macros[(EV_KEY, 3)].running)

        # stop macro 2
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 2, 0), None)
        loop.run_until_complete(asyncio.sleep(0.1))
        # was started only once
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)
        # and the trailing d was also written only once
        self.assertEqual(history.count((code_d, 1)), 1)
        self.assertEqual(history.count((code_d, 0)), 1)

        # stop all macros
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 0), None)
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 3, 0), None)
        loop.run_until_complete(asyncio.sleep(0.1))

        # it's stopped and won't write stuff anymore
        count_before = len(history)
        loop.run_until_complete(asyncio.sleep(0.1))
        count_after = len(history)
        self.assertEqual(count_before, count_after)

        self.assertFalse(active_macros[(EV_KEY, 1)].holding)
        self.assertFalse(active_macros[(EV_KEY, 1)].running)
        self.assertFalse(active_macros[(EV_KEY, 2)].holding)
        self.assertFalse(active_macros[(EV_KEY, 2)].running)
        self.assertFalse(active_macros[(EV_KEY, 3)].holding)
        self.assertFalse(active_macros[(EV_KEY, 3)].running)

    def test_hold_3(self):
        # test irregular input patterns
        code_a = 100
        code_b = 101
        code_c = 102
        system_mapping.clear()
        system_mapping._set('a', code_a)
        system_mapping._set('b', code_b)
        system_mapping._set('c', code_c)

        macro_mapping = {
            (EV_KEY, 1, 1): parse('k(a).h(k(b)).k(c)', self.mapping),
        }

        history = []

        def handler(*args):
            history.append(args)

        macro_mapping[(EV_KEY, 1, 1)].set_handler(handler)

        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 1), None)
        loop = asyncio.get_event_loop()

        loop.run_until_complete(asyncio.sleep(0.1))
        for _ in range(5):
            self.assertTrue(active_macros[(EV_KEY, 1)].holding)
            self.assertTrue(active_macros[(EV_KEY, 1)].running)
            handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 1), None)
            loop.run_until_complete(asyncio.sleep(0.05))

        # duplicate key down events don't do anything
        self.assertEqual(history.count((code_a, 1)), 1)
        self.assertEqual(history.count((code_a, 0)), 1)
        self.assertEqual(history.count((code_c, 1)), 0)
        self.assertEqual(history.count((code_c, 0)), 0)

        # stop
        handle_keycode({}, macro_mapping, InputEvent(EV_KEY, 1, 0), None)
        loop.run_until_complete(asyncio.sleep(0.1))
        self.assertEqual(history.count((code_a, 1)), 1)
        self.assertEqual(history.count((code_a, 0)), 1)
        self.assertEqual(history.count((code_c, 1)), 1)
        self.assertEqual(history.count((code_c, 0)), 1)
        self.assertFalse(active_macros[(EV_KEY, 1)].holding)
        self.assertFalse(active_macros[(EV_KEY, 1)].running)

        # it's stopped and won't write stuff anymore
        count_before = len(history)
        loop.run_until_complete(asyncio.sleep(0.1))
        count_after = len(history)
        self.assertEqual(count_before, count_after)

    def test_hold_two(self):
        # holding two macros at the same time
        history = []

        code_1 = 100
        code_2 = 101
        code_3 = 102
        code_a = 103
        code_b = 104
        code_c = 105
        system_mapping.clear()
        system_mapping._set('1', code_1)
        system_mapping._set('2', code_2)
        system_mapping._set('3', code_3)
        system_mapping._set('a', code_a)
        system_mapping._set('b', code_b)
        system_mapping._set('c', code_c)

        key_1 = (EV_KEY, 1)
        key_2 = (EV_ABS, ABS_HAT0X)
        down_1 = (*key_1, 1)
        down_2 = (*key_2, -1)
        up_1 = (*key_1, 0)
        up_2 = (*key_2, 0)

        macro_mapping = {
            down_1: parse('k(1).h(k(2)).k(3)', self.mapping),
            down_2: parse('k(a).h(k(b)).k(c)', self.mapping)
        }

        def handler(*args):
            history.append(args)

        macro_mapping[down_1].set_handler(handler)
        macro_mapping[down_2].set_handler(handler)

        loop = asyncio.get_event_loop()

        # key up won't do anything
        uinput = UInput()
        handle_keycode({}, macro_mapping, InputEvent(*up_1), uinput)
        handle_keycode({}, macro_mapping, InputEvent(*up_2), uinput)
        loop.run_until_complete(asyncio.sleep(0.1))
        self.assertEqual(len(active_macros), 0)

        """start macros"""

        handle_keycode({}, macro_mapping, InputEvent(*down_1), None)
        handle_keycode({}, macro_mapping, InputEvent(*down_2), None)

        # let the mainloop run for some time so that the macro does its stuff
        sleeptime = 500
        keystroke_sleep = config.get('macros.keystroke_sleep_ms', 10)
        loop.run_until_complete(asyncio.sleep(sleeptime / 1000))

        self.assertEqual(len(active_macros), 2)
        self.assertTrue(active_macros[key_1].holding)
        self.assertTrue(active_macros[key_1].running)
        self.assertTrue(active_macros[key_2].holding)
        self.assertTrue(active_macros[key_2].running)

        """stop macros"""

        handle_keycode({}, macro_mapping, InputEvent(*up_1), None)
        handle_keycode({}, macro_mapping, InputEvent(*up_2), None)

        loop.run_until_complete(asyncio.sleep(keystroke_sleep * 10 / 1000))

        self.assertFalse(active_macros[key_1].holding)
        self.assertFalse(active_macros[key_1].running)
        self.assertFalse(active_macros[key_2].holding)
        self.assertFalse(active_macros[key_2].running)

        events = calculate_event_number(sleeptime, 1, 1) * 2

        self.assertGreater(len(history), events * 0.9)
        self.assertLess(len(history), events * 1.1)

        self.assertIn((code_a, 1), history)
        self.assertIn((code_a, 0), history)
        self.assertIn((code_b, 1), history)
        self.assertIn((code_b, 0), history)
        self.assertIn((code_c, 1), history)
        self.assertIn((code_c, 0), history)
        self.assertIn((code_1, 1), history)
        self.assertIn((code_1, 0), history)
        self.assertIn((code_2, 1), history)
        self.assertIn((code_2, 0), history)
        self.assertIn((code_3, 1), history)
        self.assertIn((code_3, 0), history)
        self.assertGreater(history.count((code_b, 1)), 1)
        self.assertGreater(history.count((code_b, 0)), 1)
        self.assertGreater(history.count((code_2, 1)), 1)
        self.assertGreater(history.count((code_2, 0)), 1)

        # it's stopped and won't write stuff anymore
        count_before = len(history)
        loop.run_until_complete(asyncio.sleep(0.2))
        count_after = len(history)
        self.assertEqual(count_before, count_after)

    def test_two_d_pad_macros(self):
        # executing two macros that stop automatically at the same time

        code_1 = 61
        code_2 = 62
        system_mapping.clear()
        system_mapping._set('1', code_1)
        system_mapping._set('2', code_2)

        # try two concurrent macros with D-Pad events because they are
        # more difficult to manage, since their only difference is their
        # value, and one of them is negative.
        down_1 = (EV_ABS, ABS_HAT0X, 1)
        down_2 = (EV_ABS, ABS_HAT0X, -1)

        repeats = 10

        macro_mapping = {
            down_1: parse(f'r({repeats}, k(1))', self.mapping),
            down_2: parse(f'r({repeats}, k(2))', self.mapping)
        }

        history = []

        def handler(*args):
            history.append(args)

        macro_mapping[down_1].set_handler(handler)
        macro_mapping[down_2].set_handler(handler)

        handle_keycode({}, macro_mapping, InputEvent(*down_1), None)
        handle_keycode({}, macro_mapping, InputEvent(*down_2), None)

        loop = asyncio.get_event_loop()
        sleeptime = config.get('macros.keystroke_sleep_ms') / 1000
        loop.run_until_complete(asyncio.sleep(1.1 * repeats * 2 * sleeptime))

        self.assertEqual(len(history), repeats * 4)

        self.assertEqual(history.count((code_1, 1)), 10)
        self.assertEqual(history.count((code_1, 0)), 10)
        self.assertEqual(history.count((code_2, 1)), 10)
        self.assertEqual(history.count((code_2, 0)), 10)

    def test_normalize(self):
        # -1234 to -1, 5678 to 1, 0 to 0

        key_1 = (EV_KEY, BTN_TL)
        ev_1 = (*key_1, 5678)
        ev_2 = (*key_1, 0)

        # doesn't really matter if it makes sense, the A key reports
        # negative values now.
        key_2 = (EV_KEY, KEY_A)
        ev_3 = (*key_2, -1234)
        ev_4 = (*key_2, 0)

        _key_to_code = {
            (*key_1, 1): 41,
            (*key_2, -1): 42
        }

        uinput = UInput()
        handle_keycode(_key_to_code, {}, InputEvent(*ev_1), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_2), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_3), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_4), uinput)

        self.assertEqual(len(uinput_write_history), 4)
        self.assertEqual(uinput_write_history[0].t, (EV_KEY, 41, 1))
        self.assertEqual(uinput_write_history[1].t, (EV_KEY, 41, 0))
        self.assertEqual(uinput_write_history[2].t, (EV_KEY, 42, 1))
        self.assertEqual(uinput_write_history[3].t, (EV_KEY, 42, 0))

    def test_filter_trigger_spam(self):
        trigger = (EV_KEY, BTN_TL)

        _key_to_code = {
            (*trigger, 1): 51,
            (*trigger, -1): 52
        }

        uinput = UInput()

        """positive"""

        for i in range(1, 20):
            handle_keycode(_key_to_code, {}, InputEvent(*trigger, i), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*trigger, 0), uinput)

        self.assertEqual(len(uinput_write_history), 2)

        """negative"""

        for i in range(1, 20):
            handle_keycode(_key_to_code, {}, InputEvent(*trigger, -i), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*trigger, 0), uinput)

        self.assertEqual(len(uinput_write_history), 4)
        self.assertEqual(uinput_write_history[0].t, (EV_KEY, 51, 1))
        self.assertEqual(uinput_write_history[1].t, (EV_KEY, 51, 0))
        self.assertEqual(uinput_write_history[2].t, (EV_KEY, 52, 1))
        self.assertEqual(uinput_write_history[3].t, (EV_KEY, 52, 0))

    def test_ignore_hold(self):
        key = (EV_KEY, KEY_A)
        ev_1 = (*key, 1)
        ev_2 = (*key, 2)
        ev_3 = (*key, 0)

        _key_to_code = {
            (*key, 1): 21,
        }

        uinput = UInput()
        handle_keycode(_key_to_code, {}, InputEvent(*ev_1), uinput)
        for _ in range(10):
            handle_keycode(_key_to_code, {}, InputEvent(*ev_2), uinput)
        handle_keycode(_key_to_code, {}, InputEvent(*ev_3), uinput)

        self.assertEqual(len(uinput_write_history), 2)
        self.assertEqual(uinput_write_history[0].t, (EV_KEY, 21, 1))
        self.assertEqual(uinput_write_history[1].t, (EV_KEY, 21, 0))
        # linux will generate events with value 2 after key-mapper injected
        # the key-press


if __name__ == "__main__":
    unittest.main()