### Question:
AwsRDSPlatform extends Platform { public Collection<String> getVpcSecurityGroupIds (String dbInstanceIdentifier) { return amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier(dbInstanceIdentifier)) .getDBInstances() .stream() .map(DBInstance::getVpcSecurityGroups) .flatMap(Collection::stream) .map(VpcSecurityGroupMembership::getVpcSecurityGroupId) .collect(toSet()); } @Autowired  AwsRDSPlatform();   AwsRDSPlatform(AmazonRDS amazonRDS, AmazonEC2 amazonEC2); Map<String, String> getVpcToSecurityGroupMap(); @Override ApiStatus getApiStatus(); @Override PlatformLevel getPlatformLevel(); @Override PlatformHealth getPlatformHealth(); @Override List<Container> generateExperimentRoster(); @Override boolean isContainerRecycled(Container container); Map<String, String> getFilter(); void setFilter(Map<String, String> filter); void failoverCluster(String dbClusterIdentifier); void restartInstance(String... dbInstanceIdentifiers); Set<String> getClusterInstances(String dbClusterIdentifier); ContainerHealth getInstanceStatus(String... dbInstanceIdentifiers); void setVpcSecurityGroupIds(String dbInstanceIdentifier, String vpcSecurityGroupId); void setVpcSecurityGroupIds(String dbInstanceIdentifier, Collection<String> vpcSecurityGroupIds); ContainerHealth checkVpcSecurityGroupIds(String dbInstanceIdentifier, Collection<String> vpcSecurityGroupIds); Collection<String> getVpcSecurityGroupIds(String dbInstanceIdentifier); String getChaosSecurityGroup(String dbInstanceIdentifier); DBSnapshot snapshotDBInstance(String dbInstanceIdentifier); DBClusterSnapshot snapshotDBCluster(String dbClusterIdentifier); void deleteInstanceSnapshot(DBSnapshot dbSnapshot); void deleteClusterSnapshot(DBClusterSnapshot dbClusterSnapshot); boolean isInstanceSnapshotRunning(String dbInstanceIdentifier); boolean isClusterSnapshotRunning(String dbClusterIdentifier);  }### Answer:
@Test public void getVpcSecurityGroupIds () { String dbInstanceIdentifier = randomUUID().toString(); Collection<String> expectedVpcIds = new HashSet<>(); for (int x = 0; x < 100; x++) { expectedVpcIds.add(randomUUID().toString()); } when(amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier(dbInstanceIdentifier))) .thenReturn(new DescribeDBInstancesResult().withDBInstances(new DBInstance().withVpcSecurityGroups(expectedVpcIds .stream() .map(vpcIds -> new VpcSecurityGroupMembership().withVpcSecurityGroupId(vpcIds)) .collect(Collectors.toSet())))); assertThat(awsRDSPlatform.getVpcSecurityGroupIds(dbInstanceIdentifier), IsIterableContainingInAnyOrder.containsInAnyOrder(expectedVpcIds .toArray())); }