This is an example of autoloading classes and including unit tests.

.gitignore

@@ -2,5 +2,4 @@
 .htconfig.php
 #*
 favicon.*
-
-
+tests/coverage.html

Makefile

@@ -0,0 +1,2 @@
+test:
+	cd tests && phpunit --coverage-html=coverage.html && x-www-browser ./coverage.html/index.html

autoload.php

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+<?php
+spl_autoload_register(function ($class) {
+
+	// the package namespace
+	$ns = 'Friendica\Directory';
+
+	// what prefixes should be recognized?
+	$prefixes = array(
+		"{$ns}\\" => array(
+			__DIR__ . '/src',
+			__DIR__ . '/tests/unit/src',
+		),
+	);
+
+	// go through the prefixes
+	foreach ($prefixes as $prefix => $dirs) {
+
+		// does the requested class match the namespace prefix?
+		$prefix_len = strlen($prefix);
+		if (substr($class, 0, $prefix_len) !== $prefix) {
+			continue;
+		}
+
+		// strip the prefix off the class
+		$class = substr($class, $prefix_len);
+
+		// a partial filename
+		$part = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';
+
+		// go through the directories to find classes
+		foreach ($dirs as $dir) {
+			$dir = str_replace('/', DIRECTORY_SEPARATOR, $dir);
+			$file = $dir . DIRECTORY_SEPARATOR . $part;
+			if (is_readable($file)) {
+				require $file;
+				return;
+			}
+		}
+	}
+
+});

index.php

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 <?php
 
+require_once('autoload.php');
 require_once('boot.php');
 
 $a = new App;

src/Example/Hello.php

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+<?php namespace Friendica\Directory\Example;
+
+class Hello
+{
+	
+	public function sayHello(){
+		return 'Hello world!';
+	}
+	
+}

tests/phpunit.xml

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+<phpunit bootstrap="../autoload.php">
+  <testsuites>
+    <testsuite>
+      <directory>unit/src</directory>
+    </testsuite>
+  </testsuites>
+  <filter>
+    <whitelist processUncoveredFilesFromWhitelist="true">
+      <directory>../src</directory>
+    </whitelist>
+  </filter>
+</phpunit>

tests/unit/src/Example/HelloTest.php

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+<?php namespace Friendica\Directory\Example;
+
+class HelloTest extends \PHPUnit_Framework_TestCase
+{
+	
+	/**
+	 * Test the sayHello() method.
+	 */
+	public function testSayHello()
+	{
+		
+		//Create a new Hello class instance.
+		$instance = new Hello();
+		
+		//Call the method sayHello() that we want to test.
+		$output = $instance->sayHello();
+		
+		//Check that it returns the message we expect.
+		$this->assertEquals("Hello world!", $output);
+		
+	}
+	
+}