Testing 2 things in the same test method.

BAD-2_tests_in_1.php

<?php
public function testIteratesOverOneElementArrays()
{
  $iterator = new ArrayIterator(array('foo'));
  $i = 0;
  foreach ($iterator as $element) {
    $this->assertEquals('foo', $element);
    $i++;
  }
  $this->assertEquals(1, $i);
}