@Test
        @DisplayName("Should return default mime type for unknown extensions")
        void testUnknownExtension() throws IOException {
            assertEquals("application/octet-stream", mimeMap.getMimeType("unknownext"));
            assertEquals("application/octet-stream", mimeMap.getMimeType("notfound"));
            assertEquals("application/octet-stream", mimeMap.getMimeType("doesnotexist"));
        }

        @Test