Love your tests - Speaker Deck

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Love your tests @KINISOFTWARE MADRID · NOV 27-28 · 2015

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.Love your tests (Story of a healthy addiction - Chapter 2) kinisoftware kini@tuenti.com

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We are hiring!!

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Once upon a time… 2013 1

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.Tuenti <3 .Testing (Story of a healthy addiction - Chapter 1)

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• We <3 our customers • Confidence • Safety Net • Refactoring, refactoring, refactoring • It is professional, guys :)

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By Martin Fowler

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Testability

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Present day… 2

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Good good

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“It’s overwhelmingly easy to write bad unit tests that add very little value to a project while inflating the cost of code changes astronomically.”

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• Code coverage != Test quality • Don’t Repeat Yourself (Globally) • Mocks, mocks everywhere • Test smells

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.Tuenti Subject Under Test 3

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Microservices Fresh start Java Focus on testability

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Talk is cheap. Show me the code.

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Coding time (1446 tests) •Code readability + Naming + Code structure + DSL • One (logical) assert per test + Meaningful asserts + Custom matchers • Exceptions • Builders + Mothers • Mock providers • Testing real things • Customize your runners + DI

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Code readability + Naming + Code structure + DSL • Unit & Integration folders • Tests names • AAA • @SetUp vs Explicit SetUpTM • DSL

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• Unit & Integration folders

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Code readability + Naming + Code structure + DSL • Tests names

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Code readability + Naming + Code structure + DSL • AAA

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Code readability + Naming + Code structure + DSL • @SetUp vs Explicit SetUpTM

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Code readability + Naming + Code structure + DSL

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Code readability + Naming + Code structure + DSL • DSL

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One (logical) assert per test + Meaningful asserts + Custom matchers • Assert Equals vs Assert That • Actual & Expected • One (logical) assert per test • Hamcrest & Assert J • Custom matchers

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• Assert Equals vs Assert That / Actual & Expected One (logical) assert per test + Meaningful asserts + Custom matchers

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One (logical) assert per test + Meaningful asserts + Custom matchers • One (logical) assert per test

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One (logical) assert per test + Meaningful asserts + Custom matchers • Hamcrest

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• Assert J

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One (logical) assert per test + Meaningful asserts + Custom matchers • Custom matchers

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Exceptions • Try/Catch… really? • @Test(expected = ….) • @Rule ExpectedException

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Exceptions • @Test(expected = ….) • @Rule ExpectedException

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Builders + Mothers • Value Objects are leaf in our classes tree == No mocks here please • Building value objects “issue” • Builders • Mothers • Builders + Mothers

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Builders + Mothers • Builders

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Builders + Mothers

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Mock providers • DRY using mocks globally • DSL • Builders + Mocks = Mocks providers

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Testing using real things • Mocks, mocks everywhere • Sociable Unit Tests • Local resources • Helper & Utility classes

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Testing using real things • Helper & Utility classes

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Customize your runners + DI • JUnit @RunWith + your platform • SetUp and TearDown for expensive resources • DI container and “integration mocks”

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Customize your runners + DI • JUnit @RunWith + your platform

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Customize your runners + DI • SetUp and TearDown for expensive resources

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Customize your runners + DI • SetUp and TearDown for expensive resources

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Customize your runners + DI

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.Thanks!

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• Mix JVM Languages (Groovy&Scala rule!) • Java 8 fuck yeah! • JUnit Lambda • Property-based testing • Mutation Testing Keep an eye on…

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Reading a lot • Effective Unit Testing • WEWUT • Pragmatic Unit Testing with JUnit • GOOS • The Art of Unit Testing • JUnit in Action • xUnit Patterns • Refactoring