Tests are supposed to save us money. How is it, then, that many times they become millstones around our necks, gradually morphing into fragile, breakable things that raise the cost of change? We write too many tests and we test the wrong kinds of things. This talk strips away the veil and offers simple, practical guidelines for choosing what to test and how to test it. Finding the right testing ba
![Magic Tricks of Testing (RailsConf)](https://cdn-ak-scissors.b.st-hatena.com/image/square/f2f3051c3e8fcecb0b63d77d669c4d0584e67136/height=288;version=1;width=512/https%3A%2F%2Ffiles.speakerdeck.com%2Fpresentations%2Fac751bc0918e01300e0b6698bdce82b7%2Fslide_0.jpg%3F1387838)