Java Unit Testing with Unitils

Java Unit Testing with Unitils
Mikalai Alimenkou
http://xpinjection.com
21.05.2011

Background
Java Technical Lead/Scrum Master at Zoral Labs
6+ years in software development
4+ years of working by Agile methodologies
Expert in Agile engineering practices
Founder and coachat XP Injection (http://xpinjection.com)
Organizer of Selenium Camp and JEEConf conferences

General Idea
TestNG

Unitils History
Spring test integration
Multi db support
Various improvements
Unitils 3.0
DbMaintain 2.2
Testing guidelines
from brainstorm
Separate modules
Unitils 2.0
Unitils 1.0
DbMaintain 2.0
DbMaintain separated
from Unitils
Unitils RC1

Unitils Facts
Open source
Integrates with JUnit and TestNG
Modular and flexible architecture
Lots of useful utilities

Modular Architecture
Existing modules
DatabaseModule
DbUnitModule
HibernateModule
MockModule
EasyMockModule
InjectModule
SpringModule
Create new or change implementation
Configure only needed modules

Flexible Configuration
Everything is configurable
3 levels of overridden properties

Database Testing
Main problems
Mocking or real data?
JDBC, Hibernate, JPA, …
Testing approaches
Create database, clean database
Local transactions

Unitils Solution
Database maintainer
Small test datasets with DbUnit
@Transactional support
Separate schema per developer
Custom DataSource for more control

Database Maintenance
Keep database schema in VCS
Great versioning technique with incremental updates
Ability to disable constraints

Database Maintenance
Supports large number of databases
Prepares sequences and identity columns
Many options for database and data maintenance
Generate XSD or DTD for DbUnit datasets

DbMaintain Project
http://www.dbmaintain.org
Separated from Unitils
Can be used to automate deployment and upgrade procedure
Version 2.3 in May 2011

DbMaintain Scripts Structure
Incremental database updates
Committed files are unchangeable
Strict sequence
Supports repeatable scripts, postprocessing

DbMaintain Scripts Structure
Rename of scripts and folders is supported
Multi-database and patches support
Script information is stored in special table

DbMaintain Execution
Ant
<updateDatabasescriptLocations="${database.archive}">
<database driverClassName="org.hsqldb.jdbcDriver" url="jdbc:hsqldb:mem:mydb" userName="admin" password="pwd" schemaNames="PUBLIC" />
</updateDatabase>
Command line
/path/to/dbmaintain/bin/dbmaintain.sh update path/to/scriptFolderOrArchive
Java code
URL configurationUrl = new File("dbmaintain.properties").toURI().toURL();
MainFactorymainFactory = new MainFactory(configurationUrl);
DbMaintainerdbMaintainer = createDbMaintainer();
dbMaintainer.updateDatabase(false);

DbMaintain Commands
createScriptArchive
updateDatabase
markErrorScriptPerformed
markErrorScriptReverted
markDatabaseAsUpToDate
checkScriptUpdates
clearDatabase
cleanDatabase
disableConstraints
updateSequences

DbUnit Integration
Small test datasets
Only needed fields present
XSD or DTD for XML datasets validation and autocompletion

DbUnit Integration
Granular datasets on class or test level
Flexible datasets naming policy
Test and expected datasets
Multiple datasets support

EasyMock Integration
TestedObject concept
Easy mocks creation with annotations
Completely configurable mocks
Extended set of parameter conditions
Injection of mocks

Own Mocking Library

Own Mocking Library
Can be used in parallel with EasyMock
Mocking style like in Mockito
Dummy objects
Partial mocks

Spring Integration
Context loading with caching
Different types of Spring bean injection
Ability to override beans by loading multiple contexts

Hibernate Integration
Special test for mapping consistency
Easy to create and inject SessionFactory

JPA Integration
Supports Hibernate, Toplink, OpenJPA
JpaEntityManagerFactory creates EntityManager for each test
JPA utilities for injection and mapping validation

Assertion Utilities
Reflection based
Flexible comparison
Ignore types of numbers and collections
Ignore order in collections
Ignore properties
Able to compare only some properties

Assertion Utilities
Supports object hierarchy
Great differences reporting
Lenient by default

Unitils Failures
First record in DbUnit dataset should have all columns used further
Conditions must be set for all parameters in method when using EasyMock
EasyMock error reports are hard to understand
Many bugs in bug tracker

Any questions?

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Java Unit Testing with Unitils

by Mikalai Alimenkou on May 22, 2011

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Java Unit Testing with Unitils — Presentation Transcript