GW SDAB Dev Tools 2012

1

GW SDAB | DEV TOOLSHervé Vũ RousselSeptember, 12th 2012

Point of views

Ask as they come to you!

Questions?

4

Agenda

SVN ANT JUnit Ticketing system

ABOUT ME (VISUAL APPROXIMATION)

5

France

Vietnam

Unusual name

Hervé Vũ Roussel

Career choice

Brain surgeon

Engineer

Astronaut

B.S.,GWU

Honors Scholarship

Gelman Library

CS department

Civil Engineering department

Weekends

Web dev at French consulate

M. Eng., Cornell University

Going to classes

Siemens Medical Solutions, 3.5k emp.

ME

CA (Computer Associates), 15k emp.

ME

Unstoppable

Day 0 | Linked Senior

Day 1 | Linked Senior

Day 2 | Linked Senior

Day 3 | Linked Senior

Day 4 | Linked Senior

Day 5 | Linked Senior

Day 6 | Linked Senior

Day 7 | Linked Senior

Day 8: Happy seniors | Linked Senior

Day 9: More happy seniors | Linked Senior

Today | Linked Senior

Office | Linked Senior

Team | Linked Senior

ME

More team | Linked Senior

Amazing adventure | Linked Senior

TEAM WORK

40

School VS Real world

Team size

Team location

Project life

Complexity

Customers

47

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SUBVERSION (SCM)

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Where will you store your SD code?

To: [email protected]:

2003-02-01-post-simha-pres.zip

Storage

Concurrent access

Version tracking

History

54

Architecture

55

Hands on | Project

Project: ZooZooPet Educational game for kids Web & Android version API team

Company

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Hands on 1 /3

Development stage Teams

Team #1: Make the Lion speak Team #2: Make the Tiger speak

Goal: 1.0 release

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Initial download: svn checkout

Code

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Submit code: svn commit

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Submit code: svn commit

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Submit code commit

History view on repo

svn log

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svn log [path]

com/linkedsenior

games

tic-tac-toe

sudoku

word-search

video audio

svn diff

svn diff

What was I working on?

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Synchronize: svn update

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2-way merge

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2-way merge GUI

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SVN | Workflow

Synchronize• svn checkout• svn update

Work• svn add• svn mkdir• svn del

Review changes• svn diff• svn status• svn revert

Resolve (optional)• svn resolve• svn merge

Publish• svn commit

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Hands on 1/3 | Outcome

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ZooZooPet | Best game ever

1.0 released (1 billion download) Thinking about 2.0 features

More animals Team#2 assigned

Bug found in public release of 1.0!

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Hands on 2/3

1.0 released Bug #1 filed Bug fix on 1.0, release 1.1 2.0 release

Release management

Fix version 1.0 in the wild

Tagging

Tagging 1.0

svn switch [rev] [path]

Creeped up bug

Time to switch revision

20 sec.

Time to clean re-build app

30 sec.

Time to find if bug exists

5 min.

Wiping sweat

2 sec.

Num of rev between v1.0 and v1.8

<-- 150 rev. -->

Calculating…

(20+30+5*60) *

log2(150)

Time to find guilty rev

42 min 6 sec

Branching

90

Hands on 2/3 | Outcome

91

svn copy

Taggingsvn copy -r {rev} http://.../trunk http://.../branches/1.x

Branchingsvn copy -r {rev} http://.../trunk http://.../tags/1.0

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svn copy

ZooZooPet

trunk tags

1.0

branches

1.x

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Problem with evolution of code

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SVN: 3-way merge

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Best practices

What to version control? When to commit? What to say? Trunk policy

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SUBVERSION (SCM)

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ANT (BUILD TOOL)

Runnable

Deliverable

Release early, release often

Versatile build

Complex builds

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Overview

Scripting language XML based Written in Java

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Hands on 3/3

Write a build file for our application Follow instructions on SetupAnt wiki

page Follow instructions on HandsOn3 wiki

page

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Sample build file

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Target (order)

<target name="init">…<target name="compile" depends="init“…

<target name="dist" depends="compile“…

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Target (function body)

<target name="compile" depends="init" description="compile the source

" ><javac srcdir="${src}"

destdir="${build}"/></target>

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Some built-in ANT tasks (API)

<mkdir dir="${dist}/lib"/><delete dir="${dist}"/>

<javac srcdir="${src}" destdir="${build}"/>

<jar jarfile="${dist}/lib/MyProject-${DSTAMP}.jar" basedir="${build}"/>

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Variables

<property name=“compile.debug" value=“true"/>

<javac srcdir="src" destdir="build" debug="${compile.debug}" />

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Running

Advanced ANT

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ANT (BUILD TOOL)

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JUNIT (TESTING FRAMEWORK)

YAY!!

WHY? | TESTING

WHY? | TESTING

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What is it?| Test

Initial stateScenarioVerification

What’s JUnit?

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JUnit sample code

@Test public void simpleAdd() {    

Money m12CHF= new Money(12, "CHF");     Money m14CHF= new Money(14, "CHF");    

Money expected= new Money(26, "CHF");     Money result= m12CHF.add(m14CHF);   

assertTrue(expected.equals(result));

}

JUnit | Running

JUnit | Reporting

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Test driven development

1. Create a new test

2. Run test

3. Code

4. Repeat steps 2 & 3 until test

pass.

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TDD example #1

TicTacToe t = new TicTacToe();

t.makeMove(Position.TOP_LEFT);t.makeMove(Position.TOP_RIGHT);t.makeMove(Position.MIDDLE_LEFT);t.makeMove(Position.MIDDLE_RIGHT);

t.makeMove(Position.BOTTOM_LEFT);

assertTrue(t.getWinnerId(), 1);

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TDD example #2

TicTacToe t = new TicTacToe("John", "Jim");

t.set(Token.X, 0, 0); t.set(Token.Y, 2, 0); t.set(Token.X, 0, 1); t.set(Token.Y, 2, 1);

t.set(Token.X, 0, 2);

assertEquals(t.getWinner(), "John");

Test as living documentation

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Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

Bust or Budget

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Bust or Budget game rule

class BustOrBudgetGameTest { @Test void itShouldEndWhenThereIsOnlyOnePlayingTeam() { 

// Given ... bobGameDriver.startGame(team1, team2); // ... // When ... bobGameDriver.endTurn(team2, true); assert bobGameDriver.teamInPlay.size == 1; // Thenassert bobGameDriver.matchOver == true;

} }

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Poll: When to run tests?

1. Before a major deadline2. After major code change3. When Prof. Simha looks over your

shoulder4. When Prof. Parmer  looks over

your shoulder5. All of the above6. None of the above

Fixing a bug

Finding the culprit

7 stages of debugging

StageI: Denial

println “Hello world :)”

Stage II: Acceptance

println “Before call”println “After call”

Stage III: Depression

println “test”println “bla”println “here”

Stage IV: Acceptance

println “1”println “2”

Stage V: Fatigue

println “a”println “aa”println “aaa”

Stage VI: Anger

println “!)(@&#$!!!”

Stage VII: Despair

println “why”println “god”println “oh”println “why”

Deliverance

The bottleneck

When to test?

Rethinking testing

Build tools | Continuous integration

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Build tools | CI Report

156

JUNIT (TESTING FRAMEWORK)

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TICKETING SYSTEM

Bug submission

Bug lifecycle

Bug search

Organization tool

Collaboration tool

Context | Ticket

Velocity

165

TICKETING SYSTEM

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[email protected]

LINKEDIN.COM / IN / HROUSSEL