[TASK] Deprecated methods in unit tests

- Use expectedException() and expectedExceptionCode() instead of
  deprecated setExpectedException()
- Fix a couple of incomplete tests in core/Http section, add some
  and slightly refactor a bit

Resolves: #76159
Releases: master
Change-Id: I3333f94494ce76601a61e4b5286cfef982867f8f
Reviewed-on: https://review.typo3.org/48091


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Adrian Mot <adrian.mot@gmail.com>
Tested-by: Adrian Mot <adrian.mot@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>