I know these tests (this and testIsNotMultiPoint()) didn't get written this time around, but they did jump out at me.

Is it possible to make the set of coords for these test more concise? (ie. do we need 13 sets of coords to test this method?)
Is it possible to make more clear which aspect of these coords make them multipoint or not? (is it just one set of coords that change this property? can we single-out that line to make it obvious?)