how android testing changed how we think about death
DESCRIPTION
"Irreproducible bugs become highly reproducible right after delivery to the customer". This is something that happens "almost" everyday. It is well known that testing offers significant advantages as a development practice and helps ensure higher quality code with fewer defects. Unfortunately, testing Android apps can be challenging, so in this session we are gonna talk about available tools and practices that could help us accomplish our goals.TRANSCRIPT
How ANDROID TESTING changed how we think about death…
@fernando_cejas
Code samples: https://github.com/android10/Inside_Android_Testing https://github.com/android10/AndroidApplicationTestingSample
Who am I…
• Software Engineer • GDG Barcelona Organizer • Android lover • Geek • Gintonic fan…
…y un pelotudo…
Agenda?
Why testing..WTF?
• Testing increases the level of confidence in your code.
• Testing makes it possible to write new code, and refactor existing code, without worrying that you’ve broken existing functionality.
Martin Fowler: "...test-doubles ... preprogrammed with
expectation"
What is this mock thing?
Mockito is a mocking framework that tastes really good.
Mockito doesn't give you hangover because the tests are very readable and they produce clean verification errors.
GIVE A WARM WELCOME TO… mockito
Mockito Build-operate-check pattern
Mock initizalition
Initizalition using mockito test runner
Let’s verify some behaviour
Argument matchers
Verifying number of invocations / at least x / never
Making sure interaction(s) never happened on mock
Spying on real objects
Sounds familiar???
Allows you to run your android code on JVM.
Allows loading of Android Classes in pure Java Projects.
TO THE RESCUE…
Shadow Objects!
View and Resource Loading…
Shadow Activity
Shadow ImageView
• Uses real Android SDK code • Styles and themes supported • System resources are available • Performance improved • Bugs fixed
Robolectric 2.0+
Perform click Sample
Started Activity test
Should have fragment test
Device Configuration Sample
Network sample
Robolectric acts as a proxy!!!
Creating your own shadows
Creating your own shadows
Creating your own shadows
• A library by square (FTW!) • It gives a chainable (or “fluent”)
syntax for checking assertions. • Makes tests easier to write (and
read!).
FEST Android
Sample: code to modify a bitmap
Assertions with FEST
Dependency injection is a software design pattern that allows the removal of hard-coded dependencies and makes it possible to change
them, whether at run-time or compile-time
Dependency what?
Dagger
Directed Acyclic Graph
Dagger Graph sample
Dagger sample
Declare dependencies
Satisfy dependencies
Build the graph
Modules
Spoon • Acceptance tests (black box) • Automation of test execution across multiple
devices • Aggregation of the results
Spoon • Aggregation of screenshots while your tests
are running
• Robojuice • Robotium • Android Testing Framework • UI Automator • Monkey Runner
More tools…
WRITE TESTS!!!
• Simplify your architecture • Have a robust testing strategy • Use continuous integration tools • Mock/stub functionality • Create your own test runner
Best practices and some advice…
Questions?
@fernando_cejas https://github.com/android10
[email protected] http://corporate.tuenti.com/es/dev/blog
THANKS!!!