getValue
Get the value of a <textarea>, <select> or text <input> found by given selector.
If multiple elements are found via the given selector, an array of values is returned instead.
For input with checkbox or radio type use isSelected.
Usage
$(selector).getValue()
Examples
<input type="text" value="John Doe" id="username">
it('should demonstrate the getValue command', () => {
    const inputUser = $('#username');
    const value = inputUser.getValue();
    console.log(value); // outputs: "John Doe"
});