@Test
public void test_calculateChecksum_emptyList() throws Exception{

    String checksum1 = componentService.calculateChecksum(new ArrayList<Component>());
    String checksum2 = componentService.calculateChecksum(new ArrayList<Component>());
    assert checksum1 != null;
    assert checksum2 != null;
    assertTrue("Checksums match",StringUtils.equals(checksum1,checksum2));
}