public static String getProperty(final String propertyName)
    {
        final String propertyValue = System.getProperty(propertyName);

        return NULL_PROPERTY_VALUE.equals(propertyValue) ? null : propertyValue;
    }
@Test
    void shouldGetNormalProperty()
    {
        final String key = "org.agrona.test.case";
        final String value = "wibble";

        System.setProperty(key, value);

        try
        {
            assertEquals(value, SystemUtil.getProperty(key));
        }
        finally
        {
            System.clearProperty(key);
        }
    }