public function testListSequences()
    {
        if(!$this->_conn->getDatabasePlatform()->supportsSequences()) {
            $this->markTestSkipped($this->_conn->getDriver()->getName().' does not support sequences.');
        }

        $sequence = new \Doctrine\DBAL\Schema\Sequence('list_sequences_test_seq', 20, 10);
        $this->_sm->createSequence($sequence);
        
        $sequences = $this->_sm->listSequences();
        
        $this->assertType('array', $sequences, 'listSequences() should return an array.');

        $foundSequence = null;
        foreach($sequences AS $sequence) {
            $this->assertType('Doctrine\DBAL\Schema\Sequence', $sequence, 'Array elements of listSequences() should be Sequence instances.');
            if(strtolower($sequence->getName()) == 'list_sequences_test_seq') {
                $foundSequence = $sequence;
            }
        }

        $this->assertNotNull($foundSequence, "Sequence with name 'list_sequences_test_seq' was not found.");
        $this->assertEquals(20, $foundSequence->getAllocationSize(), "Allocation Size is expected to be 20.");
        $this->assertEquals(10, $foundSequence->getInitialValue(), "Initial Value is expected to be 10.");
    }