diff --git a/framework/caching/RedisCache.php b/framework/caching/RedisCache.php
index 3e45fe0..74432f4 100644
--- a/framework/caching/RedisCache.php
+++ b/framework/caching/RedisCache.php
@@ -21,6 +21,8 @@ use yii\db\redis\Connection;
  * authenticate with the server after connect.
  *
  * See [[Cache]] for common cache operations that RedisCache supports.
+ * Different from the description in [[Cache]] RedisCache allows the expire parameter of
+ * [[set]] and [[add]] to be a floating point number, so you may specify the time in milliseconds.
  *
  * To use RedisCache as the cache application component, configure the application as follows,
  *
@@ -110,7 +112,7 @@ class RedisCache extends Cache
 	 */
 	protected function getValue($key)
 	{
-		return $this->_connection->executeCommand('GET', $key);
+		return $this->_connection->executeCommand('GET', array($key));
 	}
 
 	/**
@@ -120,7 +122,13 @@ class RedisCache extends Cache
 	 */
 	protected function getValues($keys)
 	{
-		return $this->_connection->executeCommand('MGET', $keys);
+		$response = $this->_connection->executeCommand('MGET', $keys);
+		$result = array();
+		$i = 0;
+		foreach($keys as $key) {
+			$result[$key] = $response[$i++];
+		}
+		return $result;
 	}
 
 	/**
diff --git a/tests/unit/framework/caching/CacheTest.php b/tests/unit/framework/caching/CacheTest.php
index f9db4f4..021a03c 100644
--- a/tests/unit/framework/caching/CacheTest.php
+++ b/tests/unit/framework/caching/CacheTest.php
@@ -13,18 +13,35 @@ abstract class CacheTest extends TestCase
 	 */
 	abstract protected function getCacheInstance();
 
+	/**
+	 * @return Cache
+	 */
+	public function prepare()
+	{
+		$cache = $this->getCacheInstance();
+
+		$cache->flush();
+		$cache->set('string_test', 'string_test');
+		$cache->set('number_test', 42);
+		$cache->set('array_test', array('array_test' => 'array_test'));
+		$cache['arrayaccess_test'] = new \stdClass();
+
+		return $cache;
+	}
+
 	public function testSet()
 	{
 		$cache = $this->getCacheInstance();
+
 		$this->assertTrue($cache->set('string_test', 'string_test'));
 		$this->assertTrue($cache->set('number_test', 42));
 		$this->assertTrue($cache->set('array_test', array('array_test' => 'array_test')));
-		$cache['arrayaccess_test'] = new \stdClass();
 	}
 
 	public function testGet()
 	{
-		$cache = $this->getCacheInstance();
+		$cache = $this->prepare();
+
 		$this->assertEquals('string_test', $cache->get('string_test'));
 
 		$this->assertEquals(42, $cache->get('number_test'));
@@ -32,51 +49,81 @@ abstract class CacheTest extends TestCase
 		$array = $cache->get('array_test');
 		$this->assertArrayHasKey('array_test', $array);
 		$this->assertEquals('array_test', $array['array_test']);
+	}
+
+	public function testArrayAccess()
+	{
+		$cache = $this->getCacheInstance();
 
+		$cache['arrayaccess_test'] = new \stdClass();
 		$this->assertInstanceOf('stdClass', $cache['arrayaccess_test']);
 	}
 
-	public function testMget()
+	public function testGetNonExistent()
 	{
 		$cache = $this->getCacheInstance();
+
+		$this->assertFalse($cache->get('non_existent_key'));
+	}
+
+	public function testStoreSpecialValues()
+	{
+		$cache = $this->getCacheInstance();
+
+		$this->assertTrue($cache->set('null_value', null));
+		$this->assertNull($cache->get('null_value'));
+
+		$this->assertTrue($cache->set('bool_value', true));
+		$this->assertTrue($cache->get('bool_value'));
+	}
+
+	public function testMget()
+	{
+		$cache = $this->prepare();
+
 		$this->assertEquals(array('string_test' => 'string_test', 'number_test' => 42), $cache->mget(array('string_test', 'number_test')));
+		// ensure that order does not matter
+		$this->assertEquals(array('number_test' => 42, 'string_test' => 'string_test'), $cache->mget(array('number_test', 'string_test')));
+		$this->assertEquals(array('number_test' => 42, 'non_existent_key' => null), $cache->mget(array('number_test', 'non_existent_key')));
 	}
 
 	public function testExpire()
 	{
 		$cache = $this->getCacheInstance();
+
 		$this->assertTrue($cache->set('expire_test', 'expire_test', 2));
 		sleep(1);
 		$this->assertEquals('expire_test', $cache->get('expire_test'));
 		sleep(2);
-		$this->assertEquals(false, $cache->get('expire_test'));
+		$this->assertFalse($cache->get('expire_test'));
 	}
 
 	public function testAdd()
 	{
-		$cache = $this->getCacheInstance();
+		$cache = $this->prepare();
 
 		// should not change existing keys
 		$this->assertFalse($cache->add('number_test', 13));
 		$this->assertEquals(42, $cache->get('number_test'));
 
-		// should store data is it's not there yet
+		// should store data if it's not there yet
 		$this->assertTrue($cache->add('add_test', 13));
 		$this->assertEquals(13, $cache->get('add_test'));
 	}
 
 	public function testDelete()
 	{
-		$cache = $this->getCacheInstance();
+		$cache = $this->prepare();
 
+		$this->assertNotNull($cache->get('number_test'));
 		$this->assertTrue($cache->delete('number_test'));
-		$this->assertEquals(null, $cache->get('number_test'));
+		$this->assertFalse($cache->get('number_test'));
 	}
 
 	public function testFlush()
 	{
-		$cache = $this->getCacheInstance();
+		$cache = $this->prepare();
 		$this->assertTrue($cache->flush());
-		$this->assertEquals(null, $cache->get('add_test'));
+		$this->assertFalse($cache->get('number_test'));
 	}
 }
diff --git a/tests/unit/framework/caching/RedisCacheTest.php b/tests/unit/framework/caching/RedisCacheTest.php
index cc6c304..a92be09 100644
--- a/tests/unit/framework/caching/RedisCacheTest.php
+++ b/tests/unit/framework/caching/RedisCacheTest.php
@@ -31,4 +31,15 @@ class RedisCacheTest extends CacheTest
 		}
 		return $this->_cacheInstance;
 	}
+
+	public function testExpireMilliseconds()
+	{
+		$cache = $this->getCacheInstance();
+
+		$this->assertTrue($cache->set('expire_test_ms', 'expire_test_ms', 0.2));
+		usleep(100000);
+		$this->assertEquals('expire_test_ms', $cache->get('expire_test_ms'));
+		usleep(300000);
+		$this->assertFalse($cache->get('expire_test_ms'));
+	}
 }
\ No newline at end of file