PHPUnit your bug exterminator

RICARDO MELO

PHPUnit your bug
exterminator
Follow this topic:
@rjsmelo, #phpunit
PHPLX – 07 December 2013

RICARDO MELO

CTO @ DRI
● PHP, Mysql, Linux and lots of other
OSS
● ZCE, RHCE, LPI 3, ITIL, etc
● +10 years building (and breaking)
things
●

@rjsmelo

2

About

14 Year old academic spin-off
● Pragmatic OSS Orientation
● PHP, Mysql, SugarCRM, Drupal,
JavaScript, Linux, etc.
● Crafters, Integrators
●

●

Always looking for software developers
–

Yes, right now!

@rjsmelo

3

Outline

Testing Methodologies
● Testing Tools Ecosystem
● What's PHPUnit
● The "Hello World" test
● How to run your tests
● Other assertions
● Other PHPUnit topics
● The bug hunting work flow
●

1999 - 2013 DRI. Some Rights Reserved
.

4

Testing and Development Methodologies

Unit, Integration, System and
Acceptance Testing
● CMMI/Waterfall, Agile and XP
● TDD and BDD
●

.

5

Testing Tools Ecosystem

PHPUnit
● Behat
● Selenium
● Codeception
● And many more
●

.

6

What's PHPUnit

xUnit family for PHP
● Uses assertions to check the behavior
of the unit
● But it can handle other tests like
integration and system
●

.

7

Installing PHPUnit
●

Pear
pear config-set auto_discover 1
pear install pear.phpunit.de/PHPUnit
phpunit --version

.

8

Installing PHPUnit
●

Composer
{
"require-dev": {
"phpunit/phpunit": "3.7.*"
}
}
composer install
./vendor/bin/phpunit --version

.

9

The "Hello World" test
<?php
namespace Phplx;
class HelloWorld {
public function say(){
return "Hello World";
}
}

.

10

The "Hello World" test
<?php
namespace PhplxTestsHelloWorld;
use PHPUnit_Framework_TestCase
use PhplxHelloWorld;
class HelloWorldTest extends PHPUnit_Framework_TestCase
{
public function testHelloWorld(){
$obj = new HelloWorld();
$this->assertEquals("Hello World", $obj->say());
}
}

.

11

How to run your tests
# using PEAR / PHAR
phpunit --bootstrap vendor/autoload.php tests/
# using composer
./vendor/bin/phpunit tests/

.

12

How to run your tests – bootstrap.php
<?php
use PhplxApp;
require_once dirname(__DIR__) . "/vendor/autoload.php";
$app = new App();
$app->initHelloWorldApplication();

.

13

How to run your tests – phpunit.xml
<phpunit

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/3.7/phpunit.xs
d"
bootstrap="tests/bootstrap.php"
stopOnError="false"
stopOnFailure="false"
stopOnIncomplete="false"
stopOnSkipped="false"
>
<testsuites>
<testsuite name="Hello World Test Suite">
<directory suffix="Test.php">tests</directory>
</testsuite>
</testsuites>
</phpunit>

.

14

How to run your tests – phpunit
$ ./vendor/bin/phpunit
PHPUnit 3.7.28 by Sebastian Bergmann.
Configuration read from /home/rjsmelo/phplx/phpunit.xml
...
Time: 42 ms, Memory: 3.25Mb
OK (3 tests, 3 assertions)

.

15

Other assertions
●

There is a HUGE list of assertions

.

16

Use specific assertions - assertInstanceOf
<?php
use PhplxHelloWorld;
class InstanceOfTest extends PHPUnit_Framework_TestCase
{
public function testTrue(){
$obj = new stdClass();
$this->assertTrue(
$obj instanceof PhplxHelloWorld);
}
public function testInstanceOf(){
$obj = new stdClass();
$this->assertInstanceOf(
'PhplxHelloWorld', $obj);
}
}
.

17

Use specific assertions - assertInstanceOf
[...]
1) InstanceOfTest::testTrue
Failed asserting that false is true.
2) InstanceOfTest::testInstanceOf
Failed asserting that stdClass Object () is an instance of class
"PhplxHelloWorld".

.

18

Use specific assertions - JsonString
<?php
use PhplxObject;
class JsonStringTest extends PHPUnit_Framework_TestCase
{
protected $jsonString =
'{"someKey":"some thing","otherKey":"other thing"}';
public function testEquals(){
$obj = new Object();
$this->assertEquals(
$this->jsonString, $obj->myPreciousJson());
}
public function testJsonString(){
$obj = new Object();
$this->assertJsonStringEqualsJsonString(
$this->jsonString, $obj->myPreciousJson());
}
}
.

19

Use specific assertions - JsonString
[...]
1) JsonStringTest::testEquals
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'{"someKey":"some thing","otherKey":"other thing"}'
+'{"someKey":"some value","otherKey":"other thing"}'
2) JsonStringTest::testJsonString
Failed asserting that two objects are equal.
--- Expected
+++ Actual
@@ @@
stdClass Object (
'someKey' => 'some thing'
+
'someKey' => 'some value'
'otherKey' => 'other thing'
)
.

20

Other PHPUnit topics

Setup / Teardown
● Data providers
● Test doubles
●

.

21

The bug hunting work flow

Gather information on the problem
● Reproduce the problem
● Capture that as a test
● Fix it (ok... this sometimes is hard)
● All green... mission accomplished
●

.

22

The community challenge

Go to your favorite PHP project
● Or go to
https://github.com/trending?l=php
and pick one
● Fix Some Bugs!
●

.

23

QA
Follow this topic:
@rjsmelo, #phpunit

Code: https://github.com/rjsmelo/talk-phpunit
Feedback: https://joind.in/talk/view/10305

www.dri-global.com
@rjsmelo
ricardo.melo@dri-global.com

PHPUnit your bug exterminator

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