Allow multiple key delete support

The Redis DEL command allows deletion of multiple keys with a single
command.
Updated del() function to support multiple keys as well. Keys can be
passed as an array of strings or as multiple arguments to the function.

.gitignore

@@ -1,2 +1,3 @@
 vendor/
 composer.lock
+composer.phar

src/M6Web/Component/RedisMock/RedisMock.php

@@ -129,23 +129,26 @@ public function exists($key)
 
     public function del($key)
     {
-        if (func_num_args() > 1) {
-            throw new UnsupportedException('In RedisMock, `del` command can not remove more than one key at once.');
+        if ( is_array($key) ) {
+            $keys = $key;
         }
-
-        if (!isset($this->data[$key])) {
-            return $this->returnPipedInfo(0);
+        else {
+            $keys = func_get_args();
         }
 
-        $deletedItems = count($this->data[$key]);
-
-        unset($this->data[$key]);
-        unset($this->dataTypes[$key]);
-        if (array_key_exists($key, $this->dataTtl)) {
-            unset($this->dataTtl[$key]);
+        $deletedKeyCount = 0;
+        foreach ( $keys as $k ) {
+            if ( isset($this->data[$k]) ) {
+                $deletedKeyCount += count($this->data[$k]);
+                unset($this->data[$k]);
+                unset($this->dataTypes[$k]);
+                if (array_key_exists($k, $this->dataTtl)) {
+                    unset($this->dataTtl[$k]);
+                }
+            }
         }
+        return $this->returnPipedInfo($deletedKeyCount);
 
-        return $this->returnPipedInfo($deletedItems);
     }
 
     public function keys($pattern)

tests/units/RedisMock.php

@@ -41,14 +41,14 @@ public function testSetGetDelExists()
                 ->isEqualTo('OK')
             ->string($redisMock->set('test2', 'something else'))
                 ->isEqualTo('OK')
-            ->exception(function() use ($redisMock) {
-                $redisMock->del('test1', 'test2');
-            })
-                ->isInstanceOf('\M6Web\Component\RedisMock\UnsupportedException')
-            ->integer($redisMock->del('test1'))
-                ->isEqualTo(1)
-            ->integer($redisMock->del('test2'))
-                ->isEqualTo(1)
+            ->integer($redisMock->del('test1', 'test2'))
+                ->isEqualTo(2)
+            ->string($redisMock->set('test1', 'something'))
+                ->isEqualTo('OK')
+            ->string($redisMock->set('test2', 'something else'))
+                ->isEqualTo('OK')
+            ->integer($redisMock->del(array('test1', 'test2')))
+                ->isEqualTo(2)
             ->string($redisMock->set('test', 'something', 1))
                 ->isEqualTo('OK')
             ->integer($redisMock->ttl('test'))