When I worked in the fleet, we had an old ex-WWII mechanic there that got mad at me for changing the condenser with the points, cap and rotor, He argued that you had more chance of getting a bad one out of the box. I laughed at him, figured he was just cheap and then I finished my tune-up. Damned if it wouldn't start when I was done. It was a bad brand new shiny in the box Standard Blus Streak condenser. He says, see I told you so. I never forgot that. I still replace them when doing a tune-up and it's never happened to me again. Just because you have installed a new out of the box "quality" part never forget that it might just be defective, it happens, not very often, but it happens.
Congratulations on fixing it. The only other things I would have tested were the primary voltage to the coil to make sure you had enough voltage getting to it and then the resistance of the coil itself. Most of the time, but not always, a voltmeter will help you out by not guessing if an electrical part is defective or not. Still, there are times when you just give up with the meter and start throwing parts at it. Replace the parts one at a time until it starts, and when you know which part was faulty. Then you can try to diagnose the part with the meter to make a better machinic out of you. Even take a hacksaw and carefully open up the part to see what went wrong inside of it.