public function testDropForeignKey()
{
$refTable = new \Phinx\Db\Table('ref_table', array(), $this->adapter);
$refTable->addColumn('field1', 'string')->save();
$table = new \Phinx\Db\Table('table', array(), $this->adapter);
$table->addColumn('ref_table_id', 'integer')->save();
$fk = new \Phinx\Db\Table\ForeignKey();
$fk->setReferencedTable($refTable)->setColumns(array('ref_table_id'))->setReferencedColumns(array('id'));
$this->adapter->addForeignKey($table, $fk);
$this->assertTrue($this->adapter->hasForeignKey($table->getName(), array('ref_table_id')));
$this->adapter->dropForeignKey($table->getName(), array('ref_table_id'));
$this->assertFalse($this->adapter->hasForeignKey($table->getName(), array('ref_table_id')));
}