request.encoding("UTF-8");
        request.encoding("ISO-8859-1");
        request.encoding("UTF-16");

        assertEquals("UTF-16", request.encoding());
    }

    @Test
    public void testThresholdWithZero() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");

        // Threshold of 0 should be accepted
        request.threshold(0);

        assertEquals(0, request.threshold());