serialize empty HTML

Author: Khartir

src/Drivers/HtmlDriver.php

@@ -15,6 +15,10 @@ public function serialize($data): string
             throw new CantBeSerialized('Only strings can be serialized to html');
         }
 
+        if ('' === $data) {
+            return "\n";
+        }
+
         $domDocument = new DOMDocument('1.0');
         $domDocument->preserveWhiteSpace = false;
         $domDocument->formatOutput = true;

tests/Unit/Drivers/HtmlDriverTest.php

@@ -71,4 +71,12 @@ public function it_can_only_serialize_strings()
 
         $driver->serialize(['foo' => 'bar']);
     }
+
+    /** @test */
+    public function it_can_serialize_an_empty_string()
+    {
+        $driver = new HtmlDriver();
+
+        $this->assertEquals("\n", $driver->serialize(''));
+    }
 }