Tests fail when using injecting custom components globally

[iamBevan]

Describe the bug
Extending a globally registered component causes the tests associated with it to fail.

To Reproduce Steps to reproduce the behavior:
Extend a globally registered component:

Vue.use(
        ComponentA,
        {
            customComponent: CustomComponent,
        }
    );

Expected behavior
Once the components are registered in jest.setup.js, they should work as usual.

Related information:

• @testing-library/vue version: 5.8.3
• Vue version: 2.6.14
• node version: 16.15.1
• npm (or yarn) version: 8.11.0