What you are missing is the bigger picture inferred by this testing.
a) Markets don't like uncertainty, don't like seeing exchanges go under because what can happen to one can happen to another. Gox testing reduces uncertainty.
b) Gox testing indicates that they are trying to fix things, not escape with people's money.
c) Gox testing indicates that they might finish said testing and actually resume limited or full service.
The individual price ticks are meaningless, however, collectively, they are meaningful and sentiment might be changing.
Er.... from the comments in that reddit thread, I understood that the transaction attempted by MtGOX was not a test after all, just one of many small transactions that they have been doing since the lock-in. Did I understand wrong?
Perhaps the news "MtGOX is testing!" spread further and farther than the "Oops, soory"?