@Override
    public SecurityGroup securityGroup(String sgId) {
        checkArgument(!Strings.isNullOrEmpty(sgId), ERR_NULL_SG_ID);
        return osSecurityGroupStore.securityGroup(sgId);
    }
@Test
    public void testGetSecurityGroupById() {
        createBasicSecurityGroups();
        assertNotNull("Instance port did not match", target.securityGroup(SECURITY_GROUP_ID_1));
        assertNotNull("Instance port did not match", target.securityGroup(SECURITY_GROUP_ID_2));
        assertNull("Instance port did not match", target.securityGroup(UNKNOWN_ID));
    }