Fix duplicate extension being added.

Author: Potherca

src/Server.php

@@ -247,7 +247,7 @@ private function handle(string $method, string $path, $contents, $request): Resp
                                     }
                                 }
 
-                                if (isset($extensions[$contentType])) {
+                                if (isset($extensions[$contentType]) && ! str_ends_with($filename, $extensions[$contentType])) {
                                     $filename .= $extensions[$contentType];
                                 }
 

tests/unit/ServerTest.php

@@ -179,12 +179,12 @@ public static function provideSlugs()
     {
         return [
             // '' => [$slug, $mimetype, $expectedFilename],
-            'Slug with json extension, with ld+json MIME' => ['Mock Slug.json', 'application/ld+json', 'Mock Slug.json.json'],
+            'Slug with json extension, with ld+json MIME' => ['Mock Slug.json', 'application/ld+json', 'Mock Slug.json'],
             'Slug with jsonld extension, with ld+json MIME)' => ['Mock Slug.jsonld', 'application/ld+json', 'Mock Slug.jsonld.json'],
-            'Slug with PNG extension, with PNG MIME' => ['Mock Slug.png', 'image/png', 'Mock Slug.png.png'],
+            'Slug with PNG extension, with PNG MIME' => ['Mock Slug.png', 'image/png', 'Mock Slug.png'],
             'Slug with some other, extension) with Turtle MIME' => ['Mock Slug.other', 'text/turtle', 'Mock Slug.other.ttl'],
             'Slug with Turtle extension, with other MIME' => ['Mock Slug.ttl', 'some/other', 'Mock Slug.ttl'],
-            'Slug with Turtle extension, with Turtle MIME' => ['Mock Slug.ttl', 'text/turtle', 'Mock Slug.ttl.ttl'],
+            'Slug with Turtle extension, with Turtle MIME' => ['Mock Slug.ttl', 'text/turtle', 'Mock Slug.ttl'],
             'Slug without extension), with some other  MIME' => ['Mock Slug', 'some/other', 'Mock Slug'],
             'Slug without extension), with turtle MIME' => ['Mock Slug', 'text/turtle', 'Mock Slug.ttl'],
         ];