Fix test that did not tested much

This test barely tested anything.

1. The inner loop was just pointless.
2. Three of the four assertions compared the output from `Formatter.PRECISIONTEXT` with the output from `globeCoordinate.Formatter.prototype.precisionText` which is a single line that calls `Formatter.PRECISIONTEXT`. I really don't think this was intended.

Warning: This conflicts with #40. It may be better to merge #40 first and rebase this.