}

    public void test_getDefaultValue() {
        assertEquals("others", fileTypeHelper.getDefaultValue());
    }

    public void test_setDefaultValue() {
        fileTypeHelper.setDefaultValue("unknown");
        assertEquals("unknown", fileTypeHelper.getDefaultValue());

        // Test that get() returns new default value
        assertEquals("unknown", fileTypeHelper.get("non/existent"));
    }

        return filetype;
    }

    /**
     * Gets the default file type value used when MIME type is not found.
     *
     * @return the default file type value
     */
    public String getDefaultValue() {
        return defaultValue;
    }

    /**
     * Sets the default file type value to use when MIME type is not found.
     *
     * @param defaultValue the new default file type value
     */