diff --git a/tests/unit/framework/caching/CacheTest.php b/tests/unit/framework/caching/CacheTest.php
index c524956..4b34de0 100644
--- a/tests/unit/framework/caching/CacheTest.php
+++ b/tests/unit/framework/caching/CacheTest.php
@@ -1,5 +1,17 @@
 <?php
+
+namespace yii\caching;
+
+/**
+ * Mock for the time() function for caching classes
+ * @return int
+ */
+function time() {
+	return \yiiunit\framework\caching\CacheTest::$time ?: \time();
+}
+
 namespace yiiunit\framework\caching;
+
 use yiiunit\TestCase;
 use yii\caching\Cache;
 
@@ -9,6 +21,12 @@ use yii\caching\Cache;
 abstract class CacheTest extends TestCase
 {
 	/**
+	 * @var int virtual time to be returned by mocked time() function.
+	 * Null means normal time() behavior.
+	 */
+	public static $time;
+
+	/**
 	 * @return Cache
 	 */
 	abstract protected function getCacheInstance();
@@ -19,6 +37,11 @@ abstract class CacheTest extends TestCase
 		$this->mockApplication();
 	}
 
+	protected function tearDown()
+	{
+		static::$time = null;
+	}
+
 	/**
 	 * @return Cache
 	 */
diff --git a/tests/unit/framework/caching/DbCacheTest.php b/tests/unit/framework/caching/DbCacheTest.php
index 36174b9..f5bbba5 100644
--- a/tests/unit/framework/caching/DbCacheTest.php
+++ b/tests/unit/framework/caching/DbCacheTest.php
@@ -1,5 +1,7 @@
 <?php
+
 namespace yiiunit\framework\caching;
+
 use yii\caching\DbCache;
 use yiiunit\TestCase;
 
@@ -70,4 +72,16 @@ class DbCacheTest extends CacheTest
 		}
 		return $this->_cacheInstance;
 	}
+
+	public function testExpire()
+	{
+		$cache = $this->getCacheInstance();
+
+		static::$time = \time();
+		$this->assertTrue($cache->set('expire_test', 'expire_test', 2));
+		static::$time++;
+		$this->assertEquals('expire_test', $cache->get('expire_test'));
+		static::$time++;
+		$this->assertFalse($cache->get('expire_test'));
+	}
 }
diff --git a/tests/unit/framework/caching/FileCacheTest.php b/tests/unit/framework/caching/FileCacheTest.php
index 99e3cbc..b3ac8b7 100644
--- a/tests/unit/framework/caching/FileCacheTest.php
+++ b/tests/unit/framework/caching/FileCacheTest.php
@@ -22,4 +22,16 @@ class FileCacheTest extends CacheTest
 		}
 		return $this->_cacheInstance;
 	}
+
+	public function testExpire()
+	{
+		$cache = $this->getCacheInstance();
+
+		static::$time = \time();
+		$this->assertTrue($cache->set('expire_test', 'expire_test', 2));
+		static::$time++;
+		$this->assertEquals('expire_test', $cache->get('expire_test'));
+		static::$time++;
+		$this->assertFalse($cache->get('expire_test'));
+	}
 }
diff --git a/yii/base/View.php b/yii/base/View.php
index f1a9a0f..84a6f11 100644
--- a/yii/base/View.php
+++ b/yii/base/View.php
@@ -771,7 +771,7 @@ class View extends Component
 		if (!empty($this->js[self::POS_HEAD])) {
 			$lines[] = implode("\n", $this->js[self::POS_HEAD]);
 		}
-		return implode("\n", $lines);
+		return empty($lines) ? '' : implode("\n", $lines) . "\n";
 	}
 
 	/**
@@ -788,7 +788,7 @@ class View extends Component
 		if (!empty($this->js[self::POS_BEGIN])) {
 			$lines[] = implode("\n", $this->js[self::POS_BEGIN]);
 		}
-		return implode("\n", $lines);
+		return empty($lines) ? '' : implode("\n", $lines) . "\n";
 	}
 
 	/**
@@ -805,6 +805,6 @@ class View extends Component
 		if (!empty($this->js[self::POS_END])) {
 			$lines[] = implode("\n", $this->js[self::POS_END]);
 		}
-		return implode("\n", $lines);
+		return empty($lines) ? '' : implode("\n", $lines) . "\n";
 	}
 }
diff --git a/yii/rbac/DbManager.php b/yii/rbac/DbManager.php
index f3658b2..28b14d9 100644
--- a/yii/rbac/DbManager.php
+++ b/yii/rbac/DbManager.php
@@ -146,10 +146,7 @@ class DbManager extends Manager
 		}
 		$query = new Query;
 		$rows = $query->from($this->itemTable)
-			->where(array('or', 'name=:name1', 'name=:name2'), array(
-				':name1' => $itemName,
-				':name2' => $childName
-			))
+			->where(array('or', 'name=:name1', 'name=:name2'), array(':name1' => $itemName,	':name2' => $childName))
 			->createCommand($this->db)
 			->queryAll();
 		if (count($rows) == 2) {
@@ -165,10 +162,7 @@ class DbManager extends Manager
 				throw new InvalidCallException("Cannot add '$childName' as a child of '$itemName'. A loop has been detected.");
 			}
 			$this->db->createCommand()
-				->insert($this->itemChildTable, array(
-					'parent' => $itemName,
-					'child' => $childName,
-				));
+				->insert($this->itemChildTable, array('parent' => $itemName, 'child' => $childName));
 			return true;
 		} else {
 			throw new Exception("Either '$itemName' or '$childName' does not exist.");
@@ -185,10 +179,7 @@ class DbManager extends Manager
 	public function removeItemChild($itemName, $childName)
 	{
 		return $this->db->createCommand()
-			->delete($this->itemChildTable, array(
-				'parent' => $itemName,
-				'child' => $childName
-			)) > 0;
+			->delete($this->itemChildTable, array('parent' => $itemName, 'child' => $childName)) > 0;
 	}
 
 	/**
@@ -202,10 +193,7 @@ class DbManager extends Manager
 		$query = new Query;
 		return $query->select(array('parent'))
 			->from($this->itemChildTable)
-			->where(array(
-				'parent' => $itemName,
-				'child' => $childName
-			))
+			->where(array('parent' => $itemName, 'child' => $childName))
 			->createCommand($this->db)
 			->queryScalar() !== false;
 	}
@@ -220,10 +208,7 @@ class DbManager extends Manager
 	{
 		$query = new Query;
 		$rows = $query->select(array('name', 'type', 'description', 'bizrule', 'data'))
-			->from(array(
-				$this->itemTable,
-				$this->itemChildTable
-			))
+			->from(array($this->itemTable, $this->itemChildTable))
 			->where(array('parent' => $names, 'name' => new Expression('child')))
 			->createCommand($this->db)
 			->queryAll();
@@ -257,7 +242,7 @@ class DbManager extends Manager
 				'user_id' => $userId,
 				'item_name' => $itemName,
 				'bizrule' => $bizRule,
-				'data' => serialize($data)
+				'data' => serialize($data),
 			));
 		return new Assignment($this, $userId, $itemName, $bizRule, $data);
 	}
@@ -271,10 +256,7 @@ class DbManager extends Manager
 	public function revoke($userId, $itemName)
 	{
 		return $this->db->createCommand()
-			->delete($this->assignmentTable, array(
-				'user_id' => $userId,
-				'item_name' => $itemName
-			)) > 0;
+			->delete($this->assignmentTable, array('user_id' => $userId, 'item_name' => $itemName)) > 0;
 	}
 
 	/**
@@ -288,10 +270,7 @@ class DbManager extends Manager
 		$query = new Query;
 		return $query->select(array('item_name'))
 			->from($this->assignmentTable)
-			->where(array(
-				'user_id' => $userId,
-				'item_name' => $itemName
-			))
+			->where(array('user_id' => $userId,	'item_name' => $itemName))
 			->createCommand($this->db)
 			->queryScalar() !== false;
 	}
@@ -307,10 +286,7 @@ class DbManager extends Manager
 	{
 		$query = new Query;
 		$row = $query->from($this->assignmentTable)
-			->where(array(
-				'user_id' => $userId,
-				'item_name' => $itemName
-			))
+			->where(array('user_id' => $userId,	'item_name' => $itemName))
 			->createCommand($this->db)
 			->queryRow();
 		if ($row !== false) {
@@ -358,7 +334,7 @@ class DbManager extends Manager
 				'data' => serialize($assignment->getData()),
 			), array(
 				'user_id' => $assignment->getUserId(),
-				'item_name' => $assignment->getItemName()
+				'item_name' => $assignment->getItemName(),
 			));
 	}
 
@@ -382,23 +358,13 @@ class DbManager extends Manager
 				->createCommand($this->db);
 		} elseif ($type === null) {
 			$command = $query->select(array('name', 'type', 'description', 't1.bizrule', 't1.data'))
-				->from(array(
-					$this->itemTable . ' t1',
-					$this->assignmentTable . ' t2'
-				))
+				->from(array($this->itemTable . ' t1', $this->assignmentTable . ' t2'))
 				->where(array('user_id' => $userId, 'name' => new Expression('item_name')))
 				->createCommand($this->db);
 		} else {
 			$command = $query->select('name', 'type', 'description', 't1.bizrule', 't1.data')
-				->from(array(
-					$this->itemTable . ' t1',
-					$this->assignmentTable . ' t2'
-				))
-				->where(array(
-					'user_id' => $userId,
-					'type' => $type,
-					'name' => new Expression('item_name'),
-				))
+				->from(array($this->itemTable . ' t1', $this->assignmentTable . ' t2'))
+				->where(array('user_id' => $userId, 'type' => $type, 'name' => new Expression('item_name')))
 				->createCommand($this->db);
 		}
 		$items = array();
@@ -434,7 +400,7 @@ class DbManager extends Manager
 				'type' => $type,
 				'description' => $description,
 				'bizrule' => $bizRule,
-				'data' => serialize($data)
+				'data' => serialize($data),
 			));
 		return new Item($this, $name, $type, $description, $bizRule, $data);
 	}
@@ -448,13 +414,12 @@ class DbManager extends Manager
 	{
 		if ($this->usingSqlite()) {
 			$this->db->createCommand()
-				->delete($this->itemChildTable, array('or', 'parent=:name1', 'child=:name2'), array(
-					':name1' => $name,
-					':name2' => $name
-				));
-			$this->db->createCommand()->delete($this->assignmentTable, array('item_name' => $name));
+				->delete($this->itemChildTable, array('or', 'parent=:name', 'child=:name'), array(':name' => $name));
+			$this->db->createCommand()
+				->delete($this->assignmentTable, array('item_name' => $name));
 		}
-		return $this->db->createCommand()->delete($this->itemTable, array('name' => $name)) > 0;
+		return $this->db->createCommand()
+			->delete($this->itemTable, array('name' => $name)) > 0;
 	}
 
 	/**
@@ -488,23 +453,11 @@ class DbManager extends Manager
 	{
 		if ($this->usingSqlite() && $oldName !== null && $item->getName() !== $oldName) {
 			$this->db->createCommand()
-				->update($this->itemChildTable, array(
-					'parent' => $item->getName(),
-				), array(
-					'parent' => $oldName,
-				));
+				->update($this->itemChildTable, array('parent' => $item->getName()), array('parent' => $oldName));
 			$this->db->createCommand()
-				->update($this->itemChildTable, array(
-					'child' => $item->getName(),
-				), array(
-					'child' => $oldName,
-				));
+				->update($this->itemChildTable, array('child' => $item->getName()), array('child' => $oldName));
 			$this->db->createCommand()
-				->update($this->assignmentTable, array(
-					'item_name' => $item->getName(),
-				), array(
-					'item_name' => $oldName,
-				));
+				->update($this->assignmentTable, array('item_name' => $item->getName()), array('item_name' => $oldName));
 		}
 
 		$this->db->createCommand()