`container: document.body` breaks tests

[susnux]

Describe the bug A clear and concise description of what the bug is.
When having a teleport to body in a component you want to set attachTo of vue test utils to body, to do so you can set container: document.body in testing library.

This causes a problem that now render will remove the body node and causes document.body to be null after calling render.

To Reproduce Steps to reproduce the behavior:

Have a component that teleports to body and then set the container to the body.

Expected behavior
No issues.

Related information:

• @testing-library/vue version: 8.1.0
• Vue version: 3.5.25
• node version: 24
• npm (or yarn) version: 11

Additional context

This is caused by this line in the render.js:

unwrapNode(wrapper.parentElement);

This fixes it:

if (baseElement !== container) {
  unwrapNode(wrapper.parentElement);
}

[susnux]

Somehow also happens without setting container.
The code comment in the render source code also points to a non existing line in vue testing utils.
I guess the proposed fix makes sense anyways?