added some tests for sqlite sequence driver

tests/Sequence/SqliteTestCase.php

@@ -31,4 +31,25 @@
  * @version     $Revision$
  */
 class Doctrine_Sequence_Sqlite_TestCase extends Doctrine_UnitTestCase {
+    public function testCurrIdExecutesSql() {
+        $this->sequence->currId('user');
+
+        $this->assertEqual($this->adapter->pop(), 'SELECT MAX(id) FROM user_seq');
+    }
+    public function testNextIdExecutesSql() {
+        $id = $this->sequence->nextId('user');
+        
+        $this->assertEqual($id, 1);
+
+        $this->assertEqual($this->adapter->pop(), 'DELETE FROM user_seq WHERE id < 1');
+        $this->assertEqual($this->adapter->pop(), 'LAST_INSERT_ID()');
+        $this->assertEqual($this->adapter->pop(), 'INSERT INTO user_seq (id) VALUES (NULL)');
+    }
+    public function testLastInsertIdCallsPdoLevelEquivalent() {
+        $id = $this->sequence->lastInsertId('user');
+        
+        $this->assertEqual($id, 1);
+
+        $this->assertEqual($this->adapter->pop(), 'LAST_INSERT_ID()');
+    }
 }