Remove some unneeded checks/tests

Author: nicolas-grekas

Tests/Authentication/Token/RememberMeTokenTest.php

@@ -29,18 +29,6 @@ public function testConstructor()
         $this->assertTrue($token->isAuthenticated());
     }
 
-    /**
-     * @expectedException \TypeError
-     */
-    public function testConstructorSecretCannotBeNull()
-    {
-        new RememberMeToken(
-            $this->getUser(),
-            null,
-            null
-        );
-    }
-
     /**
      * @expectedException \InvalidArgumentException
      */