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HOW MUCH SHOULD WE TEST? Or how to stop hating your tests

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GOALS OF TEST SUITE • Tests should be thorough • Tests should be stable • Tests should be fast • Tests should be few (minimal)

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TEST DRIVEN DEVELOPMENT • We use test cases to guide the design of our code • 2 approaches to testing - Inside Out and Outside In • Outside In - Use integration tests to guide you • Inside Out - Build & test individual components, integrate later

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Object under test

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Object under test Incoming Messages

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Object under test Incoming Messages Outgoing Messages

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Object under test Incoming Messages Outgoing Messages

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Object under test Incoming Messages Outgoing Messages Send to self

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Object under test Incoming Messages Outgoing Messages Send to self Message Types:

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Object under test Incoming Messages Outgoing Messages Send to self Query Message Types:

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Object under test Incoming Messages Outgoing Messages Send to self Command Query Message Types:

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MESSAGE TYPES • Query: Returns something / changes nothing • Command: Returns nothing / changes something Object under test Incoming Messages Outgoing Messages Send to self Command Query

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RESOURCES • “The Magic Tricks of Testing” - Sandi Metz
 http://confreaks.tv/videos/railsconf2013- the-magic-tricks-of-testing • “Working Effectively with Unit Tests” - Jay Fields
 https://leanpub.com/wewut