Help! no spark at coil

This may sound funny but try to jump start the car and see if it will fire. Same exact thing happened to me a few weeks ago, left me stranded 130 miles from home. Checked ballast, checked and swapped coil, ignition box, reluctor had pulse. Nothing made sense why the car wouldn't fire. Decided to try and jump the car, fired right up. Weird as Hell. Drove it home, replaced battery. No problems since. Had the battery tested and it failed, yet the motor turned over fine just had no spark. Just a thought for you ....