Same testing framework

[TathagataChakraborti]

• [x] Change the unittests to pytests so we have the same thing across the board (or the other way round if we need anything specific from unittest).
• [x] Make sure they are running as part of the rest of the tests in the CI here (no change required if we are just changing to pytest).

[jkeskingvillage]

This is a legacy from a separate profiler repository.