diff --git a/tests/PHPStan/Analyser/NodeScopeResolverTest.php b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
index d7940b487fb..e3bbf904f29 100644
--- a/tests/PHPStan/Analyser/NodeScopeResolverTest.php
+++ b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
@@ -943,7 +943,6 @@ public function dataFileAsserts(): iterable
 			yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7663-php8.php');
 		}
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7663.php');
-
 	}
 
 	/**
diff --git a/tests/PHPStan/Analyser/data/bug-7663-php7.php b/tests/PHPStan/Analyser/data/bug-7663-php7.php
index 443b31cdf94..774ab2c37eb 100644
--- a/tests/PHPStan/Analyser/data/bug-7663-php7.php
+++ b/tests/PHPStan/Analyser/data/bug-7663-php7.php
@@ -7,10 +7,12 @@
 class HelloWorld7
 {
 	/**
-	 * @param 'de_DE'|'en_US' $language
+	 * @param 'de_DE'|'pretty-long' $str
 	 */
-	public function sayHello($language): void
+	public function sayHello($str): void
 	{
-		assertType("false", substr('de_DE', 10, -10));
+		assertType("false", substr('de_DE', 5, -5));
+		assertType("'y'", substr('pretty-long', 5, -5));
+		assertType("'y'|false", substr($str, 5, -5));
 	}
 }
diff --git a/tests/PHPStan/Analyser/data/bug-7663-php8.php b/tests/PHPStan/Analyser/data/bug-7663-php8.php
index 6130dec176d..3b00a5b181a 100644
--- a/tests/PHPStan/Analyser/data/bug-7663-php8.php
+++ b/tests/PHPStan/Analyser/data/bug-7663-php8.php
@@ -7,10 +7,12 @@
 class HelloWorld8
 {
 	/**
-	 * @param 'de_DE'|'en_US' $language
+	 * @param 'de_DE'|'pretty-long' $str
 	 */
-	public function sayHello($language): void
+	public function sayHello($str): void
 	{
-		assertType("''", substr('de_DE', 10, -10));
+		assertType("''", substr('de_DE', 5, -5));
+		assertType("'y'", substr('pretty-long', 5, -5));
+		assertType("''|'y'", substr($str, 5, -5));
 	}
 }