I also find this page to be very useful when looking at rules: http://www.mirror.ac.uk/sites/spamassassin.taint.org/spamassassin.org/te sts.html
Really, I for one would caution against relying on the tests.html page as documentation of the SA rules running on your system.
The website isn't always in-synch with the version running on your machine.
The website quick and easy, but in cases when you want to be sure use grep instead:
grep RULENAME /usr/share/spamassassin/*.cf
Besides, the website doesn't have anything to do with score types, and doesn't document them.
by "score types" I assume that Idan meant the difference between 1.0, 2.0, etc in the following line:
score TEST 1.0 2.0 3.0 4.0
That's documented in the Mail::SpamAssassin::Conf manpage.
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If only one valid score is listed, then that score is always used
for a test.If four valid scores are listed, then the score that is used
depends on how SpamAssassin is being used. The first score is used
when both Bayes and network tests are disabled. The second score is
used when Bayes is disabled, but network tests are enabled. The
third score is used when Bayes is enabled and network tests are
disabled. The fourth score is used when Bayes is enabled and net-
work tests are enabled.
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