diff --git a/src/Normalizers/TwitterNormalizer.php b/src/Normalizers/TwitterNormalizer.php
index 2551952..312a0b6 100644
--- a/src/Normalizers/TwitterNormalizer.php
+++ b/src/Normalizers/TwitterNormalizer.php
@@ -37,7 +37,7 @@ protected function match(string $url): array
 
         if (strlen($matches[1]) > 15) {
             throw new NormalizeException(
-                sprintf('%s name can not be longer than 15 chars: %s', static::getPlatform(), $matches[4])
+                sprintf('%s name can not be longer than 15 chars: %s', static::getPlatform(), $matches[1])
             );
         }
 
diff --git a/src/Normalizers/YoutubeNormalizer.php b/src/Normalizers/YoutubeNormalizer.php
index f1c426d..30b5685 100644
--- a/src/Normalizers/YoutubeNormalizer.php
+++ b/src/Normalizers/YoutubeNormalizer.php
@@ -19,5 +19,5 @@ public static function getPlatform(): string
 
     protected array|int $idPosition = 1;
 
-    protected array $cleanUrlSettings = [ 'forceLowerCase' => false ];
+    protected array $cleanUrlSettings = ['forceLowerCase' => false];
 }
diff --git a/tests/NormalizersTest.php b/tests/NormalizersTest.php
index 389a01e..d2137ff 100644
--- a/tests/NormalizersTest.php
+++ b/tests/NormalizersTest.php
@@ -40,6 +40,7 @@ public function testTwitterNormalizer(): void
             'https://twitter.com/code-school' => 'https://twitter.com/code',
             'https://twitter.com/code_school' => 'https://twitter.com/code_school',
             'https://twitter.com/greentextbooks#' => 'https://twitter.com/greentextbooks',
+            'https://twitter.com/grEEntextbooks' => 'https://twitter.com/greentextbooks',
             'https://twitter.com/shopbop#cs=ov=73421773243,os=1,link=footerconnecttwitterlink\',' => 'https://twitter.com/shopbop',
         ];
 
@@ -51,6 +52,33 @@ public function testTwitterNormalizer(): void
         $twitterNormalizer->normalize('https://twitter.com/share');
     }
 
+    public function testTwitterUrlPatternMismatchThrowsNormalizeException(): void
+    {
+        $twitterNormalizer = Factory::getForPlatform(TwitterNormalizer::getPlatform());
+
+        $this->expectException(NormalizeException::class);
+        $this->expectExceptionMessage("twitter pattern didn't match for https://invalidtwitter.com");
+        $twitterNormalizer->normalize('https://invalidtwitter.com');
+    }
+
+    public function testTwitterNameEqualToShareThrowsNormalizeException(): void
+    {
+        $twitterNormalizer = Factory::getForPlatform(TwitterNormalizer::getPlatform());
+
+        $this->expectException(NormalizeException::class);
+        $this->expectExceptionMessage("twitter name can not be equal to share");
+        $twitterNormalizer->normalize('https://twitter.com/share');
+    }
+
+    public function testTwitterNameLongerThan15CharsThrowsNormalizeException(): void
+    {
+        $twitterNormalizer = Factory::getForPlatform(TwitterNormalizer::getPlatform());
+
+        $this->expectException(NormalizeException::class);
+        $this->expectExceptionMessage("twitter name can not be longer than 15 chars: thisiswaytoolongusername");
+        $twitterNormalizer->normalize('https://twitter.com/thisiswaytoolongusername');
+    }
+
     public function testXNormalizer(): void
     {
         $twitterNormalizer = Factory::getForPlatform(XNormalizer::getPlatform());