[#18] Resolve PHP warning about undefined array key.

Author: joshuapease

phpunit.xml

@@ -1,7 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/|version|/phpunit.xsd"
-         bootstrap="vendor/autoload.php">
+         bootstrap="vendor/autoload.php"
+         displayDetailsOnTestsThatTriggerWarnings="true"
+         failOnWarning="true"
+         >
     <testsuites>
         <testsuite name="unit">
             <directory>tests</directory>

src/helpers/ParsingHelper.php

@@ -60,8 +60,12 @@ public static function getYouTubeIdFromUrl(string $url): ?string
 
         if ($query) {
             parse_str($query, $qs);
-            if ($qs['v'] || $qs['vi']) {
-                return $qs['v'] ?? $qs['vi'];
+
+            $v = $qs['v'] ?? null;
+            $vi = $qs['vi'] ?? null;
+            
+            if ($v || $vi) {
+                return $v ?? $vi;
             }
         }
 

tests/ParsingHelperTest.php

@@ -13,4 +13,27 @@ public function testGetVideoTypeFromUrl(): void
             ParsingHelper::getVideoTypeFromUrl('https://www.youtube.com')
         );
     }
+
+    public function testGetYouTubeIdFromUrl(): void
+    {
+        $this->assertEquals(
+            '6xWpo5Dn254',
+            ParsingHelper::getYouTubeIdFromUrl('https://www.youtube.com/watch?v=6xWpo5Dn254')
+        );
+
+        $this->assertEquals(
+            '6xWpo5Dn254',
+            ParsingHelper::getYouTubeIdFromUrl('https://www.youtube.com/watch?vi=6xWpo5Dn254')
+        );
+
+        $this->assertEquals(
+            '--HXLM8GuxA',
+            ParsingHelper::getYouTubeIdFromUrl('https://youtu.be/--HXLM8GuxA?si=pNahKJLszKr8J00u')
+        );
+
+        $this->assertEquals(
+            '--HXLM8GuxA',
+            ParsingHelper::getYouTubeIdFromUrl('https://youtube.com/watch?v=--HXLM8GuxA')
+        );
+    }
 }