request.param("key", "value");

        try {
            request.encoding("ISO-8859-1");
            fail("Expected CurlException");
        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("must be called before param method"));
        }
    }

    @Test
    public void testThresholdMethod() {

        try {
            response.getContentAsStream();
            fail("Expected CurlException");
        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("The content does not exist"));
            assertSame(exception, e.getCause());
        } catch (IOException e) {
            fail("Should throw CurlException, not IOException");
        }
    }

    @Test

     * @return the content as a string.
     * @throws CurlException if an error occurs while accessing the content.
     */
    public String getContentAsString() {
        if (contentCache == null) {
            if (contentException != null) {
                throw new CurlException("Failed to access the content.", contentException);
            }
            throw new CurlException("Failed to access the content.");
        }
        try {

     *
     * @param encoding the encoding
     * @return this CurlRequest instance
     * @throws CurlException if the method is called after the param method
     */
    public CurlRequest encoding(final String encoding) {
        if (paramList != null) {
            throw new CurlException("This method must be called before param method.");
        }
        this.encoding = encoding;
        return this;

            throw new IOException("Simulated connection failure");
        });

        // ## Act & Assert ##
        try {
            req.execute();
            fail("Should throw CurlException");
        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("Failed to"));
            assertNotNull(e.getCause());
        }
    }

    @Test