example/checkbox.py validate is not working

[g-paras]

According to the code, user must select at least one topping otherwise it should print 'You must choose at least one topping' then ask again but instead program prints a dictionary with toppings as key and empty list as value, which is wrong.

[flavienbwk]

I can reproduce the issue.

[kyzima-spb]

I can reproduce the issue.

prompt([
    {
        'type': 'checkbox',
        'name': 'invalid_value',
        'message': 'Any value invalid',
        'validate': lambda answer: False,
        'choices': [{'name': 'item 1'}, {'name': 'item 2'}, {'name': 'item 3'}]
    }
])

The example from the documentation doesn't work either.

[juandspy]

I think it's not implemented yet: https://github.com/CITGuru/PyInquirer/blob/master/PyInquirer/prompts/checkbox.py#L121