App_ArrayInterfaceTest.php

<?php

class App_ArrayInterfaceTest extends PHPUnit_Framework_TestCase {

    public function testArrayInterface() {
        $mock = $this->getMock('App_ArrayInterface');
        $this->assertTrue($mock instanceof App_ArrayInterface);

        $interface = new ReflectionClass('App_ArrayInterface');
        $this->assertTrue($interface->hasMethod('toArray'));
    }

}