The Six Magic Tricks
| Origin | Query (returns something) | Command (changes something) |
|---|---|---|
| Incoming | ① ✅ Assert return value | ② ✅ Assert public side effect |
| To Self | ③ 🚫 Ignore | ④ 🚫 Ignore |
| Outgoing | ⑤ 🚫 Ignore | ⑥ ✅ Mock expectation |
by Sandi Metz
Created
October 25, 2025 16:14
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BR Rails Conf 2013 The Magic Tricks of Testing by Sandi Metz
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