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PHPUnit your bug exterminator

RICARDO MELO

PHPLX – 07 December 2013

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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 3

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!

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4

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

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5

Testing and Development Methodologies

● Unit, Integration, System and Acceptance Testing

● CMMI/Waterfall, Agile and XP● TDD and BDD

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6

Testing Tools Ecosystem

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

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7

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

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8

Installing PHPUnit

● Pear

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

phpunit --version

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9

Installing PHPUnit

● Composer

{ "require-dev": { "phpunit/phpunit": "3.7.*" }}

composer install

./vendor/bin/phpunit --version

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10

The "Hello World" test

<?phpnamespace Phplx;

class HelloWorld { public function say(){ return "Hello World"; }}

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The "Hello World" test

<?phpnamespace Phplx\Tests\HelloWorld;use \PHPUnit_Framework_TestCaseuse \Phplx\HelloWorld;

class HelloWorldTest extends PHPUnit_Framework_TestCase{ public function testHelloWorld(){ $obj = new HelloWorld(); $this->assertEquals("Hello World", $obj->say()); }}

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12

How to run your tests

# using PEAR / PHAR phpunit --bootstrap vendor/autoload.php tests/

# using composer./vendor/bin/phpunit tests/

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13

How to run your tests – bootstrap.php

<?phpuse \Phplx\App;

require_once dirname(__DIR__) . "/vendor/autoload.php";

$app = new App();$app->initHelloWorldApplication();

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14

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.xsd" 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>

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15

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)

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16

Other assertions

● There is a HUGE list of assertions

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17

Use specific assertions - assertInstanceOf

<?phpuse \Phplx\HelloWorld;

class InstanceOfTest extends PHPUnit_Framework_TestCase{ public function testTrue(){ $obj = new stdClass(); $this->assertTrue( $obj instanceof \Phplx\HelloWorld); }

public function testInstanceOf(){ $obj = new stdClass(); $this->assertInstanceOf( '\Phplx\HelloWorld', $obj); }}

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18

Use specific assertions - assertInstanceOf

PHPUnit 3.7.28 by Sebastian Bergmann.[...]

1) InstanceOfTest::testTrueFailed asserting that false is true.

2) InstanceOfTest::testInstanceOfFailed asserting that stdClass Object () is an instance of class "\Phplx\HelloWorld".

1999 - 2013 DRI. Some Rights Reserved.

19

Use specific assertions - JsonString

<?phpuse \Phplx\Object;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()); }}

1999 - 2013 DRI. Some Rights Reserved.

20

Use specific assertions - JsonString

PHPUnit 3.7.28 by Sebastian Bergmann.[...]

1) JsonStringTest::testEqualsFailed asserting that two strings are equal.--- Expected+++ Actual@@ @@-'{"someKey":"some thing","otherKey":"other thing"}'+'{"someKey":"some value","otherKey":"other thing"}'

2) JsonStringTest::testJsonStringFailed asserting that two objects are equal.--- Expected+++ Actual@@ @@ stdClass Object (- 'someKey' => 'some thing'+ 'someKey' => 'some value' 'otherKey' => 'other thing' )

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21

Other PHPUnit topics

● Setup / Teardown● Data providers● Test doubles

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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

1999 - 2013 DRI. Some Rights Reserved.

23

The community challenge

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

● Fix Some Bugs!

Thank you

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