Add print_heading testsuite helper. NFC

[sbc100]

No description provided.

[stevenfontanella]

Can we avoid the global and just print an extra newline here?

[sbc100]

I think I ended up having to do this because:

1. Some tests suites call print_heading mulitple times.
2. We want the extra newlines also when running the suites as part of auto_update_tests.py

[stevenfontanella]

It seems that we don't need it for point 1 because only the first call would need the preceding newline (we know within the function whether to insert a newline or not) and for point 2, we could similarly add the newline here?

[sbc100]

If we have a bunch of print_heading within a single suite I think the expectation is that there will be an empty line between those sub-sections of tests.. at least I imagine that is useful?

With your suggestion this PR would effectively change that behavior. Maybe that is fine?

[stevenfontanella]

I just mean that within a testsuite we can add a print() before each subsection of the test, and in between testsuites, we'd add the newline after the code that I linked. Basically if we make each subsection end with an extra newline, and add an extra newline between each testsuite, then it should do what we want and we don't need the global logic.

[sbc100]

Sure, I can give that go.