Added MailManager::forgetMailer()

* added test

Author: duxthefux

src/Illuminate/Mail/MailManager.php

@@ -72,6 +72,17 @@ public function mailer($name = null)
         return $this->mailers[$name] = $this->get($name);
     }
 
+    /**
+     * @param string $name
+     * @return void
+     */
+    public function forgetMailer($name)
+    {
+        if(isset($this->mailers[$name])){
+            unset($this->mailers[$name]);
+        }
+    }
+
     /**
      * Get a mailer driver instance.
      *

tests/Mail/MailManagerTest.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Tests\Mail;
 
+use Illuminate\Mail\MailManager;
 use Orchestra\Testbench\TestCase;
 
 class MailManagerTest extends TestCase
@@ -32,4 +33,30 @@ public function emptyTransportConfigDataProvider()
             [null], [''], [' '],
         ];
     }
+
+    public function testForgetMailer()
+    {
+        $this->app['config']->set('mail.mailers.custom_smtp', [
+            'transport' => "smtp",
+            'host' => "example.com",
+            'port' => "25",
+            'encryption' => "tls",
+            'username' => "username",
+            'password' => "password",
+            'timeout' => 10,
+        ]);
+
+        /** @var MailManager $mailManager */
+        $mailManager = $this->app['mail.manager'];
+        $mailManager->mailer("custom_smtp");
+
+        $mailersProperty = new \ReflectionProperty($mailManager, 'mailers');
+        $mailersProperty->setAccessible(true);
+
+        $this->assertArrayHasKey("custom_smtp", $mailersProperty->getValue($mailManager), "Mailer must exist in the \$mailers-property");
+
+        $mailManager->forgetMailer("custom_smtp");
+
+        $this->assertArrayNotHasKey("custom_smtp", $mailersProperty->getValue($mailManager), "Mailer must not exist in the \$mailers-property as it must have been removed with MailManager::forgetMailer()");
+    }
 }