New toBeVisible custom matcher #7
Description
As discussed in #4, this library needs a .toBeVisible custom matcher. It operates on an element, receives no extra arguments, and passes if the element is visible to the user.
expect(element).toBeVisible()How?
This should be implemented by checking the element's computed style, and make sure that display is not none, and also visibility is not hidden or collapsed.
Why?
Doing the equivalent assertion using vanilla DOM APIs is cumbersome:
// Two assertions needed, both dealing with verbose APIs
expect(getComputedStyle(element).getPropertyValue('display')).not.toEqual('none')
expect(getComputedStyle(element).getPropertyValue('visibility')).not.toMatch(/(hidden|collapsed)/)