The best way is to fund an account and load the EA.
You can't get any closer to reality that that.
I don't know of any other way's.
Other ways won't approach reality.
For example you can test your EA on historic data, but that is reality already gone by.
However, you can use a different approach, when you use for example, already proven principles.
That means you use something that already has been tested and, is known to work.