Delegation pattern

Delegation/JuniorDeveloper.php

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+<?php
+
+namespace DesignPatterns\Delegation;
+
+/**
+ * Class JuniorDeveloper
+ * @package DesignPatterns\Delegation
+ */
+class JuniorDeveloper {
+	public function writeBadCode()
+	{
+		return "Some junior developer generated code...";
+	}
+}

Delegation/TeamLead.php

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+<?php
+
+namespace DesignPatterns\Delegation;
+
+/**
+ * Class TeamLead
+ * @package DesignPatterns\Delegation
+ * The `TeamLead` class, he delegate work to `JuniorDeveloper`
+ */
+class TeamLead
+{
+	/** @var JuniorDeveloper */
+	protected $slave;
+
+	/**
+	 * Give junior developer into teamlead submission
+	 * @param JuniorDeveloper $junior
+	 */
+	public function __construct(JuniorDeveloper $junior)
+	{
+		$this->slave = $junior;
+	}
+
+	/**
+	 * TeamLead drink coffee, junior work
+	 * @return mixed
+	 */
+	public function writeCode()
+	{
+		return $this->slave->writeBadCode();
+	}
+}

Delegation/Usage.php

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+<?php
+
+namespace DesignPatterns\Delegation;
+
+// instantiate TeamLead and appoint to assistants JuniorDeveloper
+$teamLead = new TeamLead(new JuniorDeveloper());
+
+// team lead delegate write code to junior developer
+echo $teamLead->writeCode();

Tests/Delegation/DelegationTest.php

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+<?php
+
+namespace DesignPatterns\Tests\Delegation;
+
+use DesignPatterns\Delegation;
+
+/**
+ * DelegationTest tests the delegation pattern
+ */
+class DelegationTest extends \PHPUnit_Framework_TestCase
+{
+	public function testHowTeamLeadWriteCode()
+	{
+		$teamLead = new Delegation\TeamLead(
+			new Delegation\JuniorDeveloper()
+		);
+		$this->assertEquals("Some junior developer generated code...", $teamLead->writeCode());
+	}
+}