diff --git a/README.md b/README.md
index d3288a1..e194d25 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Redis command                                    | Description
 **EXPIRE** *key* *seconds*                       | Sets a key's time to live in seconds
 **FLUSHDB**                                      | Flushes the database
 **GET** *key*                                    | Gets the value of a key
-**HDEL** *key* *field*                           | Delete one hash fields
+**HDEL** *key* *array\<fields\>*                 | Delete hash fields
 **HEXISTS** *key* *field*                        | Determines if a hash field exists
 **HMGET** *key* *array\<field\>*                 | Gets the values of multiple hash fields
 **HGET** *key* *field*                           | Gets the value of a hash field
diff --git a/composer.json b/composer.json
index cdf2149..9e61941 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,9 @@
     "autoload": {
         "psr-0": {"M6Web\\Component\\RedisMock": "src/"}
     },
+    "autoload-dev": {
+        "psr-4": {"M6Web\\Component\\RedisMock\\Tests\\Units\\": "tests/units/"}
+    },
     "require": {
         "php": ">=7.1.0"
     },
diff --git a/src/M6Web/Component/RedisMock/RedisMock.php b/src/M6Web/Component/RedisMock/RedisMock.php
index c9790a3..92948ba 100644
--- a/src/M6Web/Component/RedisMock/RedisMock.php
+++ b/src/M6Web/Component/RedisMock/RedisMock.php
@@ -739,10 +739,10 @@ public function hmget($key, $fields)
         return $this->returnPipedInfo($result);
     }
 
-    public function hdel($key, $field)
+    public function hdel($key, $fields)
     {
         if (func_num_args() > 2) {
-            throw new UnsupportedException('In RedisMock, `hdel` command can not delete more than one entry at once.');
+            throw new UnsupportedException('In RedisMock, `hdel` command does not accept more than two arguments.');
         }
 
         if (isset(self::$dataValues[$this->storage][$key]) && !is_array(self::$dataValues[$this->storage][$key])) {
@@ -753,16 +753,21 @@ public function hdel($key, $field)
             return $this->returnPipedInfo(0);
         }
 
-        if (array_key_exists($field, self::$dataValues[$this->storage][$key])) {
-            unset(self::$dataValues[$this->storage][$key][$field]);
-            if (0 === count(self::$dataValues[$this->storage][$key])) {
-                unset(self::$dataTypes[$this->storage][$key]);
-            }
+        $fields = is_array($fields) ? $fields : [$fields];
+        $info = 0;
 
-            return $this->returnPipedInfo(1);
-        } else {
-            return $this->returnPipedInfo(0);
+        foreach ($fields as $field) {
+            if (array_key_exists($field, self::$dataValues[$this->storage][$key])) {
+                unset(self::$dataValues[$this->storage][$key][$field]);
+                if (0 === count(self::$dataValues[$this->storage][$key])) {
+                    unset(self::$dataTypes[$this->storage][$key]);
+                }
+
+                $info++;
+            }
         }
+
+        return $this->returnPipedInfo($info);
     }
 
     public function hkeys($key)
diff --git a/src/M6Web/Component/RedisMock/RedisMockFactory.php b/src/M6Web/Component/RedisMock/RedisMockFactory.php
index 4502256..91c86fe 100644
--- a/src/M6Web/Component/RedisMock/RedisMockFactory.php
+++ b/src/M6Web/Component/RedisMock/RedisMockFactory.php
@@ -300,13 +300,19 @@ protected function getMethodSignature(\ReflectionMethod $method)
         $signatures = array();
         foreach ($method->getParameters() as $parameter) {
             $signature = '';
+            $parameterType = $parameter->getType();
+            $isReflectionNamedType = $parameterType instanceof \ReflectionNamedType;
             // typeHint
-            if ($parameter->isArray()) {
+            if ($isReflectionNamedType && $parameterType->getName() === 'array') {
                 $signature .= 'array ';
-            } elseif (method_exists($parameter, 'isCallable') && $parameter->isCallable()) {
+            } elseif (
+                method_exists($parameter, 'isCallable')
+                && $isReflectionNamedType
+                && $parameterType->getName() === 'callable'
+            ) {
                 $signature .= 'callable ';
-            } elseif ($parameter->getClass()) {
-                $signature .= sprintf('\%s ', $parameter->getClass());
+            } elseif ($isReflectionNamedType && $parameterType->getName() === 'object') {
+                $signature .= sprintf('\%s ', get_class($parameter));
             }
             // reference
             if ($parameter->isPassedByReference()) {
diff --git a/tests/units/RedisMock.php b/tests/units/RedisMock.php
index 7c14a7d..9e2a1f2 100644
--- a/tests/units/RedisMock.php
+++ b/tests/units/RedisMock.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace M6Web\Component\RedisMock\tests\units;
+namespace M6Web\Component\RedisMock\Tests\Units;
 
 use atoum;
 use M6Web\Component\RedisMock\RedisMock as Redis;
@@ -1247,12 +1247,22 @@ public function testHSetHMSetHGetHDelHExistsHKeysHLenHGetAll()
                 ->isEqualTo(1)
             ->integer($redisMock->hset('test', 'test2', 'something else'))
                 ->isEqualTo(1)
+            ->integer($redisMock->hset('test', 'test4', 'something else 4'))
+                ->isEqualTo(1)
+            ->integer($redisMock->hset('test', 'test5', 'something else 5'))
+                ->isEqualTo(1)
+            ->integer($redisMock->hset('test', 'test6', 'something else 6'))
+                ->isEqualTo(1)
             ->integer($redisMock->hdel('test', 'test2'))
                 ->isEqualTo(1)
             ->integer($redisMock->hdel('test', 'test3'))
                 ->isEqualTo(0)
             ->integer($redisMock->hdel('raoul', 'test2'))
                 ->isEqualTo(0)
+            ->integer($redisMock->hdel('test', ['test4']))
+                ->isEqualTo(1)
+            ->integer($redisMock->hdel('test', ['test5', 'test6']))
+                ->isEqualTo(2)
             ->string($redisMock->type('test'))
                 ->isEqualTo('hash')
             ->integer($redisMock->hdel('test', 'test1'))
diff --git a/tests/units/RedisMockFactory.php b/tests/units/RedisMockFactory.php
index 4cca61b..df2861c 100644
--- a/tests/units/RedisMockFactory.php
+++ b/tests/units/RedisMockFactory.php
@@ -1,9 +1,8 @@
 <?php
 
-namespace M6Web\Component\RedisMock\tests\units;
+namespace M6Web\Component\RedisMock\Tests\Units;
 
 use M6Web\Component\RedisMock\RedisMockFactory as Factory;
-use M6Web\Component\RedisMock\RedisMock as Mock;
 use atoum;
 
 /**