minimum_valid_rt

[andytwoods]

As per #542, a way to have a minimum RT before button presses are acknowledged.

Below, some tests I've failed to add. I couldnt override Date.now() within getKeyboardResponse without further code changes within the embedded listener function. Something for the future :)

test('should execute a function after successful keypress and after minimum_valid_rt', function(){


    var mockedDate = new Date(2017, 11, 10, 0, 0, 0)
    global.Date = jest.fn(() => mockedDate)

    var minimum_valid_rt = 1000

    var callback = jest.fn();
    jsPsych.pluginAPI.getKeyboardResponse({callback_function: callback, minimum_valid_rt: minimum_valid_rt,
        rt_method: 'date' });
    expect(callback.mock.calls.length).toBe(0);

    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
    expect(callback.mock.calls.length).toBe(0);

    mockedDate = new Date(2017, 11, 10, 0, 0, minimum_valid_rt)
    global.Date = jest.fn(() => mockedDate)

    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
    expect(callback.mock.calls.length).toBe(0);

    mockedDate = new Date(2017, 11, 10, 0, 0, minimum_valid_rt+1)
    global.Date = jest.fn(() => mockedDate)

    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
    expect(callback.mock.calls.length).toBe(0);

    });

[twiecki]

Thanks!