Unit Testing, TDD and the Walking Skeleton

Unit Testing, Test Driven Development and the Walking Skeleton Seb Rose Twitter: @sebrose Blog: claysnow.blogspot.com E-mail: [email_address] Phone: 01721 788178

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Don’t we all know enough about testing? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

One book to rule them all? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DISCLAIMER ,[object Object],[object Object],[object Object],[object Object],[object Object]

What is a walking skeleton? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why start with the skeleton? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acceptance Test Driven Development ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is TDD? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The basics ,[object Object],[object Object],[object Object],[object Object]

When does unit testing become TDD? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TDD and “agile” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Emergent design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Executable Documentation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Challenges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

For TDD to work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Stop Press: “TDD no substitute for testing” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TDD summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is Unit Testing? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

No free lunch ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Testability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A test is not a unit test if: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Necessity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Granularity ,[object Object],[object Object],[object Object],public void shouldSortTwoStringsAndReportCorrectSize() { SortedSet<String> animals = new TreeSet<String>(); animals.add(“Zebra”); animals.add(“Anteater”); assertEquals(2, animals.size()); assertEquals(“Anteater”, animals.first()); assertEquals(“Zebra”, animals.last()); }

Understandability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Maintainability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reiteration: 5 -ities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tests can only be run once they have been written ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tests are only useful when they are run ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Demonstrate value of unit tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A few myths I hope I’ve dispelled ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Unit Testing, TDD and the Walking Skeleton

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Editor's Notes