Object-Oriented Programming in and Test-Driven Development with PHP 5

Who I Am Born in 1978. Student of Computer Science, University of Bonn, Germany. Member of the PHP Development Team. Author of PHP Open Source projects like PHPUnit or phpOpenTracker.

Born in 1978.

Student of Computer Science, University of Bonn, Germany.

Member of the PHP Development Team.

Author of PHP Open Source projects like PHPUnit or phpOpenTracker.

Who Are You? Who of you uses PHP? Who of you does OOP with PHP? Who of you has looked at PHP 5 already?

Who of you uses PHP?

Who of you does OOP with PHP?

Who of you has looked at PHP 5 already?

Classes and Objects

Classes and Objects

Classes and Objects

Constructor

Destructor

Class Type Hints

References

References in PHP 4

References in PHP 5

Object Cloning

Class Context

Abstract Classes

Interfaces

Exceptions

Interceptor Methods

Interceptor Methods

Interceptor Methods

Interceptor Methods

Interceptor Methods

Iterators

Why Unit Tests? Why Unit Tests? Why test software at all (as a developer)? „I have no time to write tests!“ „Testing is boring and stupid!“ „My code is flawless! At least it is good enough.“ „It is the testing department's job to test, right?“ These excuses lead to a vicious circle that is hard to break.

Why Unit Tests?

Why test software at all (as a developer)?

„I have no time to write tests!“

„Testing is boring and stupid!“

„My code is flawless! At least it is good enough.“

„It is the testing department's job to test, right?“

These excuses lead to a vicious circle that is hard to break.

Test-Driven Development Write the test before the production code! The test motivates the production code. There can be no production code that is not covered by a test at any time. Improved confidence in the code. Write only as much production code as needed to make the corresponding test pass! The production code is ready when the test passes. Helps to prevent bloated code.

Write the test before the production code!

The test motivates the production code.

There can be no production code that is not covered by a test at any time.

Improved confidence in the code.

Write only as much production code as needed to make the corresponding test pass!

The production code is ready when the test passes.

Helps to prevent bloated code.

Unit Testing Frameworks Unit Tests Originate in Procedural Programming. Unit = Procedure. Object-Oriented Programming Unit = Method, Class, Package, Project. Only automated test excecution and analysis makes Test-Driven Development feasible. If tests would have to be manually executed they were doomed to be ignored. That is what frameworks like PHPUnit are for ;-)

Unit Tests

Originate in Procedural Programming.

Unit = Procedure.

Object-Oriented Programming

Unit = Method, Class, Package, Project.

Only automated test excecution and analysis makes Test-Driven Development feasible.

If tests would have to be manually executed they were doomed to be ignored.

That is what frameworks like PHPUnit are for ;-)

PHPUnit PHPUnit is a regression testing framework used by the developer who implements Unit Tests in PHP. It is a port of JUnit, which is the de-facto standard in the Java World. Has features JUnit doesn't (or only through add-ons), like Code Coverage, TestDox, and support for incomplete tests. Work on PHPUnit for PHP 4 started in 2001. No longer developed, bug fixes only. PHPUnit2 is a complete rewrite that uses the new object-oriented language features of PHP 5. Will get a JMock-inspired implementation of Mock Objects later this year. It aims at „API Similarity“ with JUnit so that existing documentation can be leveraged.

PHPUnit is a regression testing framework used by the developer who implements Unit Tests in PHP.

It is a port of JUnit, which is the de-facto standard in the Java World.

Has features JUnit doesn't (or only through add-ons), like Code Coverage, TestDox, and support for incomplete tests.

Work on PHPUnit for PHP 4 started in 2001.

No longer developed, bug fixes only.

PHPUnit2 is a complete rewrite that uses the new object-oriented language features of PHP 5.

Will get a JMock-inspired implementation of Mock Objects later this year.

It aims at „API Similarity“ with JUnit so that existing documentation can be leveraged.

PHPUnit

PHPUnit

The BankAccount Example Contract A bank account's balance ... is initially zero. ... cannot become negative. Interface getBalance() setBalance($balance) depositMoney($amount) withdrawMoney($amount)

Contract

A bank account's balance

... is initially zero.

... cannot become negative.

Interface

getBalance()

setBalance($balance)

depositMoney($amount)

withdrawMoney($amount)

The BankAccount Example

The BankAccount Example

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These slides are available under the Creative Commons Attribution-NoDerivs-NonCommercial 2.0 license.

You are free to copy, distribute, display, and perform the work under the following conditions:

Attribution: You must give the original author credit.

Noncommercial: You may not use this work for commercial purposes.

No Derivative Works: You may not alter, transform, or build upon this work.

For any reuse or distribution, you must make clear to others the license terms of this work.

Any of these conditions can be waived if you get permission from the author.

Your fair use and other rights are in no way affected by the above.