/**
  * @covers CIUnit_Framework_Assert::assertNull()
  */
 public function testAssertNull()
 {
     CIUnit_Framework_Assert::assertNull(null);
     try {
         CIUnit_Framework_Assert::assertNull('string');
     } catch (CIUnit_Framework_Exception_AssertionFailed $e) {
         return;
     }
     $this->fail();
 }