Issue #2514196 by pameeela, Aki Tendo, Lendude, lauriii:...

Issue #2514196 by pameeela, Aki Tendo, Lendude, lauriii: AliasManager->getAliasByPath() handles $path in confusing manner

core/modules/path_alias/src/AliasManager.php

@@ -194,7 +194,7 @@ public function getPathByAlias($alias, $langcode = NULL) {
    * {@inheritdoc}
    */
   public function getAliasByPath($path, $langcode = NULL) {
-    if ($path[0] !== '/') {
+    if (!str_starts_with($path, '/')) {
       throw new \InvalidArgumentException(sprintf('Source path %s has to start with a slash.', $path));
     }
     // If no language is explicitly specified we default to the current URL

core/modules/path_alias/tests/src/Unit/AliasManagerTest.php

@@ -210,6 +210,16 @@ public function testGetAliasByPathNoMatch() {
     $this->aliasManager->writeCache();
   }
 
+  /**
+   * Tests the getAliasByPath method exception.
+   *
+   * @covers ::getAliasByPath
+   */
+  public function testGetAliasByPathException(): void {
+    $this->expectException(\InvalidArgumentException::class);
+    $this->aliasManager->getAliasByPath('no-leading-slash-here');
+  }
+
   /**
    * Tests the getAliasByPath method for a path that has a matching alias.
    *