7 Steps for writing your first test

@gil_zilberfeld

SELA DEVELOPER PRACTICEMay 5-9, 2013

Gil Zilberfeld

7 Steps for writing your first test

@gil_zilberfeld

Who am I?

www.typemock.com

typemock.com/blog

@typemock

www.gilzilberfeld.com

[email protected]

@gil_zilberfeld

@gil_zilberfeld

Step 0: Prepare

• Know your tools

• Evaluate the risk

• Choose your partner

@gil_zilberfeld

Step 1: What to test

• What you’re working on• Bug or feature?• Logic• Read it first• What not to test:• Multithreading• Stored procedures• UI

@gil_zilberfeld

Step 2: Get ready

• Pick organization strategy• Create test projects• Remove fluff• VS I’m looking at you

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Step 3: Pick a scenario

• Scenario consists of • Context• Logic• Success criteria

• Pick the simplest scenario• Say it!• Name it!• Assert it!

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@gil_zilberfeld

Step 4: Identify dependencies• Read the code• Constructor parameters• Fields• Statics• Global state

• Mocking strategy• None• Where to mock• How to mock

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Step 5: Simplify design

• Refactor with tools: VS, R#, DevExpress• Close down regions you’re not going to cover• Rename fields• Extract methods

• Manual refactoring works too• …but more risky

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Step 6: Here we go!

• Arrange• Run• Fail• Arrange more• Run• …..• Success!

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Step 7: Move on!

• Pick the next scenario• Say it• Name it• Assert it

• Mutate the test setup• Arrange• Run • …• Win!

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Congratulations!

• This is just the beginning• Lifetime improvement• Picking scenarios• Naming• Mocking• Refactoring

@gil_zilberfeld

Would you like to know more?

www.typemock.com

typemock.com/blog

@typemock

www.gilzilberfeld.com

[email protected]

@gil_zilberfeld

@gil_zilberfeld

Thank You