@Test
public void testPrePersist() {

	CodeSystem codeSystem = CodeSystem.getBuilder(CODESYSTEM_OID,
			CODESYSTEM_CODE, CODESYSTEM_NAME, CODESYSTEM_USERNAME).build();
	codeSystem.prePersist();
	Date creationTime = codeSystem.getCreationTime();
	Date modificationTime = codeSystem.getModificationTime();
	assertNotNull(creationTime);
	assertNotNull(modificationTime);
	assertEquals(creationTime, modificationTime);
}