fixed the correct mock return values

tests/Doctrine/Tests/DBAL/Schema/Visitor/SchemaSqlCollectorTest.php

@@ -17,10 +17,10 @@ class SchemaSqlCollectorTest extends \PHPUnit_Framework_TestCase
                      ->will($this->returnValue(array("foo")));
         $platformMock->expects($this->exactly(1))
                      ->method('getCreateSequenceSql')
-                     ->will($this->returnValue(array("bar")));
+                     ->will($this->returnValue("bar"));
         $platformMock->expects($this->exactly(1))
                      ->method('getCreateForeignKeySql')
-                     ->will($this->returnValue(array("baz")));
+                     ->will($this->returnValue("baz"));
 
         $schema = $this->createFixtureSchema();