History of SelfTest::test_mem 1 change

In testbench/selftest.py, lines 28–51 on 12673a41ba171e8324048662eae7ffd77c14453bb43edca023026f60f34d4978. 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 28,51:testbench/selftest.py.