Bree, to the best of my knowledge we don't have one. There are the checks that are made when you click the SAVE button before your changes are recorded … when you get big yellow or red bars with warnings about data items like missing genders or dates that are inconsistent with other family members.
Recently, I noticed that these checks also include making sure that all <ref> tags have a </ref> tag after them and that's one of the ones that won't permit you to SAVE ANYWAY - you have to correct it before you're permitted to save your changes. I'm not sure how far the check is carried, though - for example, if you have a <ref name="something" /> tag, I don't know if the check will ensure that you have a <ref name="something"> … </ref> somewhere else (where the same "something" is used).