How to test SQL Server Standard Basic Availability Group?
Unfortunately, there is no magic switch to make Developer / Enterprise / Evaluation Editions behave like Standard (though we've been asking for that for years; this Connect item is from 2009, and it was only the first one I found). So you have at least two alternatives:


Get an MSDN subscription. Ask around; your employer (or a fellow employee) may already have a suitable subscription. To get SQL Server you only need VS Professional ($1,199 for the first year; $799 per year afterward). With this edition, you can install any number of instances of any edition of SQL Server, as long as it is only used in a dev and/or test scenario.
Assuming you already have the Standard Edition licenses for production (or can get them soon), as long as they aren't installed at the same time, you should be able to use that licensing in dev/test and then uninstall it completely before deploying to production. If you have MSDN (or additional licenses you're not using yet), you could go on this way until you use them; if not, you'd be in violation of the licensing agreement. Honestly, MSDN is a cheap and effective way to avoid this (but I know that it can bring about the temptation to use those cheaper licenses for production machines).