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テスト対象としてEntryクラスを作成しました。

• ステータス（下書き・公開済・削除）を持つ。
• 初期ステータスは下書き
• ステータスはメソッドを通じて変更できる。

	<?php
	class Entry {
	const STATUS_DRAFT = 'draft';
	const STATUS_PUBLISHED = 'published';
	const STATUS_DELETED = 'deleted';
	var $status = self::STATUS_DRAFT;
	var $title;
	public function publish() {
	$this->status = self::STATUS_PUBLISHED;
	}
	public function delete() {
	$this->status = self::STATUS_DELETED;
	}
	}
	?>

view raw Entry.php hosted with by GitHub

	<?php
	spl_autoload_register(function ($className) {
	include "$className.php";
	});
	class EntryTest extends PHPUnit_Framework_TestCase {
	public function testStatus() {
	$entry = new Entry();
	$this->assertEquals(Entry::STATUS_DRAFT, $entry->status);
	$entry->publish();
	$this->assertEquals(Entry::STATUS_PUBLISHED, $entry->status);
	$entry->delete();
	$this->assertEquals(Entry::STATUS_DELETED, $entry->status);
	}
	}
	?>

view raw EntryTest.php hosted with by GitHub

$ phpunit --debug EntryTest.php 
PHPUnit 3.6.2 by Sebastian Bergmann.


Starting test 'EntryTest::testStatus'.
.

Time: 0 seconds, Memory: 5.50Mb

OK (1 test, 3 assertions)

これを振舞駆動開発なテストで書きなおしてみました。PHPUnit_Extensions_Story_TestCaseをextendsし、runGiven、runWhen、runThenを実装する必要があります。

	<?php
	spl_autoload_register(function ($className) {
	include "$className.php";
	});
	class EntrySpec extends PHPUnit_Extensions_Story_TestCase {
	/**
	* @scenario
	*/
	public function statusForNewEntryIsDraft() {
	$this->given('New Entry')
	->then('Status should be', Entry::STATUS_DRAFT);
	}
	/**
	* @scenario
	*/
	public function statusAfterPublishEntryIsPublished() {
	$this->given('Some Entry')
	->when('publish Entry')
	->then('Status should be', Entry::STATUS_PUBLISHED);
	}
	/**
	* @scenario
	*/
	public function statusAfterDeleteEntryIsDeleted() {
	$this->given('Some Entry')
	->when('delete Entry')
	->then('Status should be', Entry::STATUS_DELETED);
	}
	public function runGiven(&$world, $action, $arguments) {
	switch($action) {
	case 'New Entry':
	case 'Some Entry':
	$world['entry'] = new Entry();
	break;
	default:
	return $this->notImplemented($action);
	}
	}
	public function runWhen(&$world, $action, $arguments) {
	switch($action) {
	case 'delete Entry':
	$world['entry']->delete();
	break;
	case 'publish Entry':
	$world['entry']->publish();
	break;
	default:
	return $this->notImplemented($action);
	}
	}
	public function runThen(&$world, $action, $arguments) {
	switch($action) {
	case 'Status should be':
	$this->assertEquals($arguments[0], $world['entry']->status);
	break;
	default:
	return $this->notImplemented($action);
	}
	}
	}
	?>

view raw EntrySpec.php hosted with by GitHub

$ phpunit --debug --verbose --printer PHPUnit_Extensions_Story_ResultPrinter_Text EntrySpec.php
PHPUnit 3.6.2 by Sebastian Bergmann.

EntrySpec
 [x] Status for new entry is draft

   Given New Entry 
    Then Status should be draft

 [x] Status after publish entry is published

   Given Some Entry 
    When publish Entry 
    Then Status should be published

 [x] Status after delete entry is deleted

   Given Some Entry 
    When delete Entry 
    Then Status should be deleted

Scenarios: 3, Failed: 0, Skipped: 0, Incomplete: 0.

パッと見、コード量が多くなってしまいましたが、テスト対象がサンプル程度なので。実装が増えてきたときに、runGiven、runWhen、runThenを良い感じに使いまわせるようにすると、効果大きそうです。
ちなみにPHPUnit、PHPUnit_StoryともにPEARでサクッとインストール可能です。