assertEquals("image/jpeg", mimeMap.getMimeType("jpg"));
            }
        }

        @Test
        @DisplayName("Should handle rapid succession of different extensions")
        void testRapidDifferentExtensions() throws IOException {
            String[] extensions = { "pdf", "doc", "xls", "html", "jpg", "gif", "png", "txt", "xml", "css" };
            for (String ext : extensions) {