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LOGO SPEAKER‘S COMPANY

The Charm of MockitoTest Spies in Action

Szczepan Faber

Sabre Holdings


2

whoami

> Developer

> Coach

> Open source contributor

> Bartender who serves you Mockito

> Works for Sabre Holdings in Krakow/Poland


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agenda

> The charm in action: less slides more action

> Test-driving with Mockito and classic mocking tools

> My goal is: to help you write high quality tests that push high

quality application code.


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what are mocks?

> (simplification warning) Substitutes of real objects for purposes of testing

> What libraries do you use?

> Ok, Szczepan, enough talking, start coding


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the charm of Mockito

> intuitive

> explict

> tries very hard not to produce brittle tests

> enables given-when-then BDD-style tests

> separates stubbing from verification

> has good point of failure

> produces clean stack trace

> has @Mock annotation


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the charm of Mockito

> inOrder() verification

> atLeast(x), times(x), etc. verification

> verifyNoMoreInteractions()

> consecutive stubbing: thenReturn(x).thenThrow(y)

> stubbing with generic Answers

> flexible arguments matching: anyObject(), etc.

> integrated with hamcrest matchers


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the charm is working

> Mockito for python

> Mockito for flex

> Mockito-like library for javascript

> Mockito-like library for C++

> Spying in .Net

> Mockito extensions

> The user base...


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what I don’t like about Mockito

> a bit inconsistent API:

verify(mock).method();

when(mock.method()).thenReturn(x);

> stubbing voids is different:

doThrow(ex).when(mock).method();

> may lead to overmocking because it’s too easy to mock ☺


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Your takeaway from this session

You know how to increase quality of your code with Mockito library + BDD test

template

You learned the API of mocking tools

You learned about mock objects & test spies


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feedback

> szczepiq<at>gmail.com

> mockito mailing lists (http://mockito.org)

> feel free to ask after the session or anytime during the conference


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regards

jMock guys for Mock Objects

EasyMock guys for their innovative syntax

Gerard Maszeros for sorting out mocking terminology

Mockito users and contributors for their ideas

You guys for surviving this session


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last slide (I promise)Sorry if I misused EasyMock or jMock...

Do TDD and write great tests with whatever tool that works for you!

Yummy. No hangover

Useful links:

- Martin Fowler ‘Mocks arent Stubs’

- wiki on BDD, Dan North’s blog

- Paul Szulc blog entry on the ‘test template’

- xUnit patterns by Gerard Maszeros

- mockobjects.org

- mockito.org

- Brett Schuchert tutorial on Mockito

- Infinitest.org


Szczepan Faber http://mockito.org

Sabre Holdings szczepiq<at>gmail.com

the charm of mockito - jazoonjazoon.com/history/portals/0/content/archivwebsite/jazoon.com/...the...

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