I thought people might be interested in this as this kind of bias testing is pretty topical. It does take about 15 minutes to complete. There are lots of biases you can test for. I have a weak automatic preference for cisgender people over transgender people, apparently (you can have none, weak, moderate and strong).
Disclaimer: I am not saying this is NOT a big steaming pile of codswallop
implicit.harvard.edu/implicit/selectatest.html