History of SelfTest::test_zeroflag 1 change

In testbench/selftest.py, lines 159–175 on 39d98c9da02ad9fc397ccdc29d897c2337c04d23457efd8b673305c75274a15b. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 159,175:testbench/selftest.py.