hasclass doesn't work with testcafe CSS selectors

I am using testcafe version -

I am trying to apply an assertion to see if an element is clickable or not (expect to not be clickable).

I've found the elements class name and a dynamic sibling class which appears to not be clickable in the browser element.

I've attached two snapshots below of the actual UI element and its DOM:

• The element in the UI I want to detect

• chrome dev-tools Elements

for some unknown reason, the hasclass function keeps failing because the required class cannot be found.

.expect()buttonEssentialplan30Mb.hasClass('.c-form-plan-box--disabled')).ok()