componentWillUnmount is not being called

[jankuca]

The componentWillUnmount lifecycle method is not being called when a renderer is reused to render a component of a different type (which results in a new component instance being created and mounted).

Introduced by f3090d5

const renderer = reactTestRender.createRenderer(ComponentA)
renderer.render()
renderer._Component = ComponentB
renderer.render()
// ComponentA#componentWillUnmount is not called.

This is why the component type cannot be swapped for a single renderer.

The raw ReactShallowRenderer from ReactTestUtils does not have this issue but it on the other hand does not call componentDidMount and componentDidUpdate. The correct tool for the tested situation has to be chosen for now.