The absolute best way to test a forex trading strategy is in a live environment, but when you are first looking at one it is unreasonable to expect people to be able to spend a month just checking if it might work. So instead we have a method of back testing that can greatly speed up results, and is almost as good as testing live.
This video covers my method on back testing in this manner. Highly recommended for you to do this to get to grips with the strategy.