Fix on change validation

[mmarkelov]

Fix #1915

Just pass isDayBlocked prop to inputs controllers to add some extra check

[ljharb]

there's 4 components changed, and only 1 of them has tests - can you add tests for the other 3?

[ljharb]

I still only see tests for the controllers, but no unit tests for the (now, 5) individual changed components.

[mmarkelov]

I still only see tests for the controllers, but no unit tests for the (now, 5) individual changed components.

I don't understand what kind of tests do you expect. I just added another one to check passing isDayBlocked from SingleDatePicker to SingleDatePickerInputController

[ljharb]

To be clear: you changed DateRangePicker, so there should be tests for those changes in https://github.com/airbnb/react-dates/blob/master/test/components/DateRangePicker_spec.jsx. Also SingleDatePicker, so there should be tests in https://github.com/airbnb/react-dates/blob/master/test/components/DateRangePicker_spec.jsx.

Basically, every component should be individually unit tested, even if it's already covered by tests for a consuming component.