Make testing easier and more productive by applying test-driven development strategies to the world of iOS and Objective-C. Join us to learn about the tools that are available, and hear strategies for writing more testable code and robust tests. You'll be ready to take the next step and integrate these strategies into your daily workflow.

1. iOS Unit Testing Like a Boss
Matt Darnall, Salesforce
@mdarnall

2. Safe harbor
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forward-looking statements.

3. Who
Is this
Guy?

4. Objective-C developers have, for the
most part, remained relatively
apathetic to Unit Testing ("There's
that SenTest thing, but who uses
that, really?").
-Matt Thompson
NSHipster.com

5. “.. I don't think we have a problem with
tools. We have a cultural problem that
we need to fix, and that's something only
we (you and me) can do something
about. Go and spread the word”
-Luis Solano
Nocilla Project

6. Testing doesn’t have
to be an afterthought

7. Stand On The
Shoulders Of
Giants

8. Use tools that support
developer efficiency
and happiness

9. My
Testing
Tools
✓ Specta /
Expecta
✓ OCMock
✓ OHHTTPStubs
✓ AppCode
✓ XCTool

10. Specta
✓ Fluent style
similar to RSpec,
Mocha, etc.
✓ Lightweight and
easy to setup
✓ Asynchronous
Testing

11. Expecta
✓ Similar to
RSpec
Matchers
✓ Easy to read
✓ Framework
agnostic

12. OCMoc
k
✓
✓
✓
✓
Stubs
Mocks
Partial Mocks
Protocol
Mocks

13. AppCod
e
✓ Refactorings
✓ Code analysis
✓ Better
navigation of
projects

14. XCTool
✓ Tool for builds
and tests at the
command line
✓ Better support for
Continuous
Integration

15. Find the tools that
help you
be productive and
efficient

16. The Magic Tricks
of Testing
Sandi Metz
Programmer, Author, Speaker

17. Good
Tests
Are
✓ Thorou
gh
✓ Stable
✓ Fast

18. Focus on messages
Incoming
Object Under Test
Sent To
Self
Outgoing

19. Message Types
Queries: Return something, change
nothing
Commands: Return nothing, change
something

21. Rule #1
Test incoming query messages
by making assertions
about what they send back

23. Rule #2
Test incoming command
messages
by making assertions
about direct public side effects

25. Rule #3
Do not test private methods
Do not make assertions about their
result
Do not expect to send them

27. Rule #4
Do not test outgoing query messages
Do not make assertions about their
result
Do not expect to send them

29. Rule #5
Expect to send
outgoing command messages

31. GitHub Trending Repositories

32. Magic Tricks Applied to
iOS

33. Incoming Query
Message
numberOfRowsInSection:
UITableViewDataSource
cellForRowAtIndexPath:
Incoming
Queries
make assertions
about what is sent back

34. Incoming Command
Message
ViewController
view
Incoming Command
make assertions
about direct public side
effects

35. Testing Outlets &
1
Actions
Test that outlets exist
2 Test that outlets contain actions back to
methods on the controller
3 Send the action command to the
ViewController and assert any public side
effects.

36. Incoming Command & Outgoing
Query
viewWillAppear
Incoming
Command
ViewController
GithubSearchClient
getTrendingRepositories
Outgoing
Query
Incoming
Query
Do not test outgoing query messages
Do not make assertions about their result
Do not expect to send them

37. Stub the outgoing query
message
ViewController
getTrendingRepositories
Test Double
Outgoing
Query
Stubs provide “canned” answers
to calls made during the test

38. Dependency
Injection
initWithSearchClient
ViewController
✓ Pass dependencies to initializer (aka Constructor
Injection)
✓ Set dependencies with properties (aka Setter
injection)

39. Outgoing
Commands
Model
postNotification
Outgoing
Command
Expect to send
outgoing command
messages
NSNotificationCenter

40. Outgoing
Commands
ViewController
addObserver
Outgoing
Command
Expect to send
outgoing command
messages
NSNotificationCenter

41. More!
✓
Follow on Chatter
✓
http://http://bit.lyhttp://bit.ly/http:
//bit.ly/HvRbZQ
✓
http://http://mdarnall.com
✓
Get Involved!

42. ✓
Thanks!
Sandi Metz
✓
The maintainers of these
awesome projects

43. Matt Darnall
@mdarnall
mdarnall.com