[DBAL-717] Fix bug in MasterSlaveConnection with keepSlave option and switch...

[DBAL-717] Fix bug in MasterSlaveConnection with keepSlave option and switch back after transaction.

Conflicts:
	tests/Doctrine/Tests/DBAL/Functional/MasterSlaveConnectionTest.php

lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php

@@ -163,11 +163,12 @@ class MasterSlaveConnection extends Connection
         }
 
         if ($this->connections[$connectionName]) {
-            if ($forceMasterAsSlave) {
-                $this->connections['slave'] = $this->_conn = $this->connections['master'];
-            } else {
             $this->_conn = $this->connections[$connectionName];
+
+            if ($forceMasterAsSlave && ! $this->keepSlave) {
+                $this->connections['slave'] = $this->_conn;
             }
+
             return false;
         }
 

tests/Doctrine/Tests/DBAL/Functional/MasterSlaveConnectionTest.php

@@ -102,4 +102,23 @@ class MasterSlaveConnectionTest extends DbalFunctionalTestCase
         $conn->connect('slave');
         $this->assertFalse($conn->isConnectedToMaster());
     }
+
+    /**
+     * @group DBAL-335
+     */
+    public function testKeepSlaveInsertStaysOnMaster()
+    {
+        $conn = $this->createMasterSlaveConnection($keepSlave = true);
+        $conn->connect('slave');
+
+        $conn->insert('master_slave_table', array('test_int' => 30));
+
+        $this->assertTrue($conn->isConnectedToMaster());
+
+        $conn->connect();
+        $this->assertTrue($conn->isConnectedToMaster());
+
+        $conn->connect('slave');
+        $this->assertFalse($conn->isConnectedToMaster());
+    }
 }