Add tests for the min and max methods.
Add tests for the min and max methods.

unt-libraries/texas-choropleth,damonkelley/texas-choropleth,damonkelley/texas-choropleth,unt-libraries/texas-choropleth,damonkelley/texas-choropleth,damonkelley/texas-choropleth,unt-libraries/texas-choropleth,unt-libraries/texas-choropleth