[tommikaikkonen]

Property-based testing has made testing more productive and fun for me. You write a few lines of code that produce a large amount of tests. The idea is obviously so useful, I'm surprised it's uncommon in practice. When you think about coverage in terms of inputs applied instead of statements executed, property-based testing is far more productive than writing tests by hand.

It's not a silver bullet though. Some property-based tests are easy to write but offer little value. Sometimes you spend more time writing code to generate the correct inputs than the value of the test warrants. It has a learning curve. Still, I think it is the most powerful tool you can master for testing.