A MOCKERY OF A PRESENTATION

Gil ZilberfeldTypemock

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Who am I?

Software developer for 15 years

Technical Evangelist at Typemock

@gil_zilberfeld

Let me tell you about my first REAL job...

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What’s the plan?

The isolation problem

Hand rolling  

The tools you can use

Start now

o It's not that hard

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Why do we need isolation?

Applications are complex

We can’t touch a live system

When we call the database

Setup

Teardown

Repeat

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And then…

When tests run slowly

You stop running tests

You stop writing tests

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 Really…

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What do I need?

A mock?A stub?A fake?A test double?

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Mocks aren't stubs!

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Modern Tests

AAAArrangeActAssert

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AAA DEMO

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Mocks vs. stubs don't matter in AAA world, so let's use fake

 

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Fakes help me change behavior without changing the code 

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Fakes help me verify calls

 

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Roll your own fakes

• Derive from an interface

• Override virtual methods

• Inject it

MVC DEMO

 

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41%

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Isolation (not mocking) Frameworks   

• Focus on the code under test, not the other way around

• APIs for changing behavior and verification

ISOLATION FRAMEWORKS DEMO

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What are the differences?

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My name is Gil andI did not use a framework

I used hand rolled fakesuntil it became complicated and I stopped unit testing

I knew about isolation frameworks, read about them, but thought they were too complicated

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My name is Gil and I was an idiot

(I'm better now)

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Unit tests are the antidote to stupid bugs

it's impossible to stick with unit testing without fakes

It's a waste of time using hand rolled mocks

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Start now

It's a productivity tool

Make it part of your tool belt

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Resources Typemock Blog

http://www.typemock.blog Mock Comparison Project

http://code.google.com/p/mocking-frameworks-compare/

Twitter: @gil_zilberfeld This week in testing:

http://www.typemock.com/this-week-in-test/

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Questions?