Add a test for validating columns with a fractional widths. This test fails at this time on browsers that support sub-pixels.
Add a test for validating columns with a fractional widths. This test fails at this time on browsers that support sub-pixels.

While here, also add a sanity test for expected validation errors.

Treesaver/treesaver,Treesaver/treesaver,Treesaver/treesaver