Another way is to connect the capacitor between the positive of a battery and an ammeter and the other side of that to the negative and see what you get. I was testing big ones yesterday like that but using the mains via a silicon diode, a 15W lamp and a 10kΩ resistor.
The continuity tester I've posted in the 'Homebrew' section is dashed good for moderate to large sizes. If all's well it will howl but the tone will become lower in pitch and then cease. If it keeps buzzing or just pipping you've got problems. Small ones will either produce a single pip or nothing. Sadly that could mean it's open-circuit so isn't conclusive.
The continuity tester I've posted in the 'Homebrew' section is dashed good for moderate to large sizes. If all's well it will howl but the tone will become lower in pitch and then cease. If it keeps buzzing or just pipping you've got problems. Small ones will either produce a single pip or nothing. Sadly that could mean it's open-circuit so isn't conclusive.