@Test
public void testGetForwardAndInverseKeys_pixelCoding_forwardCoding() {

    final String forwardKey = System.getProperty(SYSPROP_OLCI_PIXEL_CODING_FORWARD);
    try {
        System.setProperty(SYSPROP_OLCI_PIXEL_CODING_FORWARD, "hoppla");
        final String[] codingKeys = OlciProductFactory.getForwardAndInverseKeys_pixelCoding();
        assertEquals("hoppla", codingKeys[0]);
        assertEquals("INV_PIXEL_QUAD_TREE", codingKeys[1]);
    } finally {
        if (forwardKey != null) {
            System.setProperty(SYSPROP_OLCI_PIXEL_CODING_FORWARD, forwardKey);
        } else {
            System.clearProperty(SYSPROP_OLCI_PIXEL_CODING_FORWARD);
        }
    }
}