Slaying Bugs with Gradle and Jenkins

Slaying bugs
w/ Gradle and Jenkins
David Kay
Wednesday, September 11, 13

Overview
• Gradle
• Jenkins

Build Tools?

Unless your name is John Carmack, you aren’t.
So what are we left with?

WTF is ?
• New Build system
• Alternatives
• ant
• maven
• buck
In other words...

Trust me,

it’s awesome.

Vlad putin is not convinced

Build Tools
• ant
• maven
• buck

• Simple
• Mature
• Customizable
What’s Awesome:
In other words, it’s like duct tape

If you’re the kind of person to build a prom dress out of duct tape

It’ll be a great ﬁt

• Lots of work
• No dependency management
What Sucks:
For me, too much work

• Mature
• Comprehensive
• Dependency management
• Easy conﬁguration
What’s Awesome:

• Massively complex
• Shitty integration with libproject / .aar
• Hard to ﬁx
What Sucks:

Buck

Buck
What’s Awesome:
• SOOOO FAST
• Simple
• Easy to compartmentalize project

Buck
What Sucks:
• No dependency management
• No support for running tests on device
• Poor documentation

And the winner is....

And the winner is....
HOV!

Basics

Basics
• Built on Groovy

Basics
• Built on Groovy
• gradle ﬁles are Groovy ﬁles
So, uh, where were we...

Basics
• gradle files are Groovy files
def square(x) {
x * x
}
in your build file!

Hello World
> gradle -q hello
Hello world!
task hello {
doLast {
println 'Hello world!'
}
}
build.gradle
how to run

LAME

Hello Java
> gradle assemble
apply plugin: 'java'
build.gradle
how to run

Not Bad...

Hello Android
buildscript {
dependencies {
classpath 'com.android.tools.build:gradle:0.5.6'
}
}
apply plugin: 'android'
android {
compileSdkVersion 17
}
build.gradle
> gradle assemble
how to run

Alright!

Hello Android
src/
main/
res/
value/
layout/
...
java/
com/
...
test/
res/
....
src/
....
Directory Structure

Multi-Project
include ':HelloGradle', ':vendor:volley'
settings.gradle
project-root/

Dependencies
...
dependencies {
// from a local jar
compile files('jackson.jar')
// from maven central/etc
compile 'com.jayway.android.robotium:robotium-solo:4.2'
// from a library project
compile project(':vendor:volley')
}
...
build.gradle

Test Tools
• Unit tests: Robolectric
• Integration/end-to-end: Robotium

OKOK
How do we RUN the tests?

Hello Android
> gradle assemble
# compile debug/release/test
> gradle check
# run all tests
how to run

Nice!
But how do we AUTOMATE it?

Jenkins!!!
like a certain other butler

Jenkins!!!
• Rock-solid
• Plugins
• Hackable/extensible
What’s Awesome:
like a certain other butler

Won’t tell you stories about Burmese jewel bandits.
...but at least he won’t walk out on you to prove a point.

Jenkins!!!
• First-time conﬁg
• Android Emulator :(
• Resource-intensive
What Sucks:

Build System
Build Slaves

Build System Ouput
S3 Bucket
Build Errors
Dev Team
Beta Testers

Pitfalls
• Headless Emulator
• Android Emulator / Xvnc delay
• -no-audio

Comprende!

Comprende!
WTF?

“How a programmer reads your resume” - Steve Hanov
http://stevehanov.ca/blog/resume_comic.png

CheckStyle

CheckStyle
<module name="Checker">
<module name="TreeWalker">
<property name="tabWidth" value="2"/>
<module name="Indentation">
<property name="caseIndent" value="2"/>
<property name="basicOffset" value="2"/>
</module>
<module name="GenericWhitespace"/>
<module name="AvoidStarImport"/>
<module name="ConstantName"/>
<module name="EmptyBlock"/>
<module name="MemberName"/>
<module name="ConstantName"/>
<module name="MethodName"/>
<module name="TypeName"/>
</module>
<module name="StrictDuplicateCode">
<property name="min" value="15"/>
</module>
</module>

defaultConfig {
versionName '0.1.1'
versionCode System.env.BUILD_NUMBER ?
"$System.env.BUILD_NUMBER".toInteger() : 2
}
build.gradle
Auto-build Number
Why is this relevant?

Bug Hunting

defaultConfig {
versionName '0.1.1'
versionCode System.env.BUILD_NUMBER ?
"$System.env.BUILD_NUMBER".toInteger() : 2
}
build.gradle
Auto-build Number

Thanks!
• http://bit.ly/gradle-jenkins for the code

Recommended Reading
Android Gradle Plugin User Guide
Growing Object-Oriented Software, Guided By Tests

Shameless Pitch
We build apps for iOS & Android
www.gargoyle.co

Contact
David Y. Kay
@DavidYKay
dk@gargoyle.co

Slaying Bugs with Gradle and Jenkins

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