Format tests as well

The unnecessary parentheses for "new" are a bit annoying, but I
can live with it...

Add some missing type annotations

Avoid most MockBuilder uses in NodeVisitor testing

This removes all the warnings about at() usage ... even though
it is still used. Apparently warnings don't get emitted if the
at()

Avoid most MockBuilder uses in NodeVisitor testing

This removes all the warnings about at() usage ... even though
it is still used. Apparently warnings don't get emitted if the
at() usage is inside a data provider?

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