Delta Debugging Demo Presented by Xia Cheng Motivation

Delta Debugging - Demo Presented by: Xia Cheng

Motivation • Automation is difficult • fail analysis needs complete understanding of the program • Automated debugging tools –Delta Debugging to resolve the problems

History • In 2001, Andreas Zeller wrote an article “Automated Debugging: Are We Close? ” • Zeller’s studies regarding the isolation of causeeffect chains from computer programs and the simplification of failure-inducing input • Eclipse’s interactivity with JUnit is an advantage of the platform

Delta Debugging • automated debugging approach based on systematic testing • Find failure-inducing circumstances automatically— – Circumstances, such as the program input, changes to the program code, or program executions.

DDInput • Failure-Inducing Input • Find out which part of the input causes your program to fail

The goal of DDInput • to automatically minimize an input file until only the part relevant for a failure remains • with the DDInput plug-in, this huge file can automatically be minimized until only the failureinducing statement remains. • To implement it by JUnit test case

Functionality of DDInput • Run DDInput as soon as JUnit test fails • Determine, if the failing JUnit test opens a resource • If it opens a file, determine if the file is responsible for the failing of the test • If the file is responsible, minimize it by using DDCore • Show the process of the Delta Debugging algorithm and the results to the user

Installation • Go to http: //www. st. cs. uni-sb. de/eclipse/ • Click DDInput and download DDCore_DDInput. zip • Unzipped it into Eclipse folder

Configuration • Start ECLIPSE. • Select Help→ Software Updates→ Find and Install. . . • Choose Search for new features to install • and select Next. Select The Eclipse Project Updates

Configuration (Cont. ) • Read the license and accept the terms (if you agree) and select Next. • Choose the ECLIPSE installation and select Finish. • The feature is not signed (yet), so likely we will get a warning. Select Install. • Restart the ECLIPSE workbench to complete the installation.

Application Guide • Create Delta Debugging View – Click Eclipse main menu Window – Choose Show View->Other… – In Java folder, choose Delta. Debugging View • Delta Debugging View includes: – Isolate Failure-Inducing Input – Minimize Failure-Inducing Input

Application Guide • File->New->JUnit Test Case • Name the file • Outline window shows the file name and all its method names

Limitation • Add the possibility to abort the process • Increase the stability • Fix a probable memory hole