diff --git a/tests/TransparentEmailTest.php b/tests/TransparentEmailTest.php
index cd34838..ae4e760 100644
--- a/tests/TransparentEmailTest.php
+++ b/tests/TransparentEmailTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace bkrukowski\TransparentEmail\Tests;
 
 use bkrukowski\TransparentEmail\Emails\Email;
+use bkrukowski\TransparentEmail\Emails\EmailInterface;
 use bkrukowski\TransparentEmail\ServiceCollector;
 use bkrukowski\TransparentEmail\ServiceCollectorInterface;
 use bkrukowski\TransparentEmail\Services\TlenPl;
@@ -49,6 +50,28 @@ class TransparentEmailTest extends \PHPUnit_Framework_TestCase
         ];
     }
 
+    /**
+     * @dataProvider providerDefault
+     *
+     * @param EmailInterface $inputEmail
+     * @param string $expectedEmail
+     */
+    public function testDefault(EmailInterface $inputEmail, string $expectedEmail)
+    {
+        $this->assertEquals($expectedEmail, (new TransparentEmail())->getPrimaryEmail($inputEmail));
+    }
+
+    public function providerDefault()
+    {
+        return [
+            [new Email('John.Doe+spam@gmail.com', true), 'johndoe@gmail.com'],
+            [new Email('Jane.Doe+spam@outlook.com', true), 'jane.doe@outlook.com'],
+            [new Email('John.Doe@tlen.pl', true), 'john.doe@o2.pl'],
+            [new Email('ALIAS@janedoe.33mail.com', true), 'janedoe@janedoe.33mail.com'],
+            [new Email('John.Doe-facebook@yahoo.com', true), 'john.doe@yahoo.com'],
+        ];
+    }
+
     private function createServiceCollector(array $classes = []) : ServiceCollectorInterface
     {
         $collector = new ServiceCollector();