Hold the log tests to a working page

The log requests passed on any answer short of a crash. The search
checks after the first read a page an earlier test wrote, so run alone
they passed with no page at all, and three tests shared one title. The
switcher checks found the right option selected but not that it was
the only one, and a failed check left its tag behind for the tests
after it. The broken walk's log was written and never read.

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