Throwing Exception for bad URL formats

DependencyInjection/SwiftmailerTransportFactory.php

@@ -99,7 +99,9 @@ public static function resolveOptions(array $options)
         ];
 
         if (isset($options['url'])) {
-            $parts = parse_url($options['url']);
+            if (false === ($parts = parse_url($options['url']))) {
+                throw new \InvalidArgumentException(sprintf('Supplied url [%s] is not a valid format.', $options['url']));
+            }
             if (isset($parts['scheme'])) {
                 $options['transport'] = $parts['scheme'];
             }

Tests/DependencyInjection/SwiftmailerTransportFactoryTest.php

@@ -161,6 +161,33 @@ public function testCreateTransportWithSmtpAndWithoutRequestContext()
         $this->assertSame($authHandler->getAuthMode(), $options['auth_mode']);
     }
 
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Supplied url [smtp://localhost:25&auth_mode=cra-md5] is not a valid format.
+     */
+    public function testCreateTransportWithBadURLFormat()
+    {
+        $options = [
+            'url' => 'smtp://localhost:25&auth_mode=cra-md5',
+            'transport' => 'smtp',
+            'username' => null,
+            'password' => null,
+            'host' => 'localhost',
+            'port' => null,
+            'timeout' => 30,
+            'source_ip' => null,
+            'local_domain' => null,
+            'encryption' => null,
+            'auth_mode' => null,
+        ];
+
+        SwiftmailerTransportFactory::createTransport(
+            $options,
+            null,
+            new \Swift_Events_SimpleEventDispatcher()
+        );
+    }
+
     /**
      * @dataProvider optionsAndResultExpected
      */