diff --git a/test/PHPMailer/PHPMailerTest.php b/test/PHPMailer/PHPMailerTest.php
index 683efb45..ac9bdfca 100644
--- a/test/PHPMailer/PHPMailerTest.php
+++ b/test/PHPMailer/PHPMailerTest.php
@@ -1057,10 +1057,6 @@ EOT;
         $this->Mail->setLanguage('fr');
         $this->Mail->Sender = '';
         $this->Mail->createHeader();
-        self::assertFalse($this->Mail->set('x', 'y'), 'Invalid property set succeeded');
-        self::assertTrue($this->Mail->set('Timeout', 11), 'Valid property set failed');
-        self::assertTrue($this->Mail->set('AllowEmpty', null), 'Null property set failed');
-        self::assertTrue($this->Mail->set('AllowEmpty', false), 'Valid property set of null property failed');
     }
 
     public function testBadSMTP()
diff --git a/test/PHPMailer/SetTest.php b/test/PHPMailer/SetTest.php
new file mode 100644
index 00000000..e80a1097
--- /dev/null
+++ b/test/PHPMailer/SetTest.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * PHPMailer - PHP email transport unit tests.
+ * PHP version 5.5.
+ *
+ * @author    Marcus Bointon <phpmailer@synchromedia.co.uk>
+ * @author    Andy Prevost
+ * @copyright 2012 - 2020 Marcus Bointon
+ * @copyright 2004 - 2009 Andy Prevost
+ * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
+ */
+
+namespace PHPMailer\Test\PHPMailer;
+
+use PHPMailer\Test\TestCase;
+
+/**
+ * Test property setting functionality.
+ */
+final class SetTest extends TestCase
+{
+
+    /**
+     * Miscellaneous calls to improve test coverage and some small tests.
+     */
+    public function testMiscellaneous()
+    {
+        self::assertFalse($this->Mail->set('x', 'y'), 'Invalid property set succeeded');
+        self::assertTrue($this->Mail->set('Timeout', 11), 'Valid property set failed');
+        self::assertTrue($this->Mail->set('AllowEmpty', null), 'Null property set failed');
+        self::assertTrue($this->Mail->set('AllowEmpty', false), 'Valid property set of null property failed');
+    }
+}