review test cases outside main test framework

[oxarbitrage]

we started with intense_tests where we decided to move tests back into the main suite with some modifications:
#718

we need to check what are the tests in benchmarks, performance and app. see if we can move them up and/or if they are worth to keep. fix if needed, this is old stuff.

not a priority but the issue is open to keep track of the progress on this.
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[oxarbitrage]

with the changes made by @jmjatlanta at #804 we have the app_test working.

we have left to review:

• performance tests -> resolved by Add performance test #1337
• benchmark tests -> Clean up test suites #2046

[abitmore]

Closed by #2046.