Update testing suite

Author: nyamsprod

CHANGELOG.md

@@ -10,7 +10,7 @@ All Notable changes to `PHP Domain Parser` starting from the **5.x** series will
 
 ### Fixed
 
-- [#321](https://github.com/jeremykendall/php-domain-parser/issues/321) improve resolving private domain suffix
+- [#321](https://github.com/jeremykendall/php-domain-parser/issues/321) improve resolving private domain suffix. `Rules::getPrivateDomain` will now throw if the domain name does not contain a "private" TLD.
 
 ### Deprecated
 

src/RulesTest.php

@@ -594,7 +594,7 @@ public function effectiveTLDProvider(): iterable
         ];
     }
 
-    public function testIssue321(): void
+    public function testIssue321Success(): void
     {
         $result = self::$rules->resolve('node857-gelofesta.users.scale.virtualcloud.com.br');
         self::assertSame('users.scale.virtualcloud.com.br', $result->suffix()->value());
@@ -604,4 +604,11 @@ public function testIssue321(): void
         self::assertSame('com.br', $result->suffix()->value());
         self::assertTrue($result->suffix()->isICANN());
     }
+
+    public function testIssue321Failure(): void
+    {
+        $this->expectException(UnableToResolveDomain::class);
+
+        self::$rules->getPrivateDomain('clientportal.virtualcloud.com.br');
+    }
 }