<?php

class ArrayTest extends PHPUnit_Framework_TestCase {
  function testFlatten() {
    // Missing\_Array\flatten()
    $this->markTestIncomplete();
  }
}

<?php

class ArrayTest extends PHPUnit_Framework_TestCase {
  function testFlatten() {
    $this->assertEquals(
      array('a', 'b', 'c', 'd'),
      Missing\_Array\flatten(array(
        array('a','b'),
        'c',
        array(array(array('d'))),
      ))
    );
  }
}

Add a test for flatten
Add a test for flatten
