Before I eat an egg, I always fill up a glass with water and gently place an egg in it. If the egg is really fresh it will sink to the bottom and lay on it's side - perfect!

If the egg sinks to the bottom, but only the tip touches, then it's still good to eat, but not super fresh. Note: most eggs I do the freshness test on fall in this range.

how to test if an eggs is good or bad.

If however, the egg floats, DO NOT EAT it, it has likely gone bad and not safe to eat.

I check the freshness of my eggs as I cook rather than all at once - they could go bad after the test if sitting in the fridge for too long, so testing before cooking is best.