### Question:
RDSRaiderImpl implements RDSRaider { @Override public List<DBStatus> getInstancesStatus(List<String> dbInstanceIds) { List<DBInstance> dbInstances = rdsDelegator.getAmazonRds().describeDBInstances(new DescribeDBInstancesRequest()).getDBInstances(); List<DBStatus> statuses = new ArrayList<DBStatus>(); for (Iterator<DBInstance> it = dbInstances.iterator(); it.hasNext(); ) { DBInstance dbInstance = it.next(); if (dbInstanceIds.contains(dbInstance.getDBInstanceIdentifier())) { statuses.add(new DBStatus(dbInstance.getDBInstanceIdentifier(), dbInstance.getDBInstanceStatus())); } } return statuses; } RDSRaiderImpl(); @Override List<DBInstance> getAllDbInstances(); @Override List<DBInstance> getInstanceIdsForAvailabilityZone(String availabilityZone, List<String> dbInstanceIdsToIgnore); @Override List<DBStatus> getInstancesStatus(List<String> dbInstanceIds); @Override void stopInstances(List<String> dbNames); @Override void startInstances(List<String> dbNames); @Override List<String> getAllDbInstanceNames(); @Override List<String> getDBInstancesStatus(); @Override String getDBInstanceStatus(String dbName); @Override void rebootDbInstances(List<String> dbNames); @Override void rebootDbInstance(String dbName); @Override void rebootDbInstanceWithForceFailover(String dbName); @Deprecated void detachSecurityGroup(String dbName, String securityGroup); @Deprecated void attachSecurityGroup(String dbName, String securityGroup); @Override List<String> getSecurityGroups(String dbName); @Override List<String> getSubnetIds(String dbName); @Override void detachSecurityGroups(String dbName, String... securityGroups); @Override void attachSecurityGroups(String dbName, String... securityGroups); @Override void detachSubnet(String dbName, String subnetId); @Override void attachSubnet(String dbName, String subnetId); @Override void restoreDBInstanceFromSnapshot(String dbName, String snapshotId); @Override void modifyDbStorageSize(String dbName, int newSize); @Override void modifyDbInstanceClass(String dbName, String dbInstanceClass); @Override void modifyDbIops(String dbName, Integer iops); @Override String getDBInstanceClass(String dbName); @Override Integer getDBStorageSize(String dbName); @Override Integer getIops(String dbName); @Override void generateSnapshot(String dbName, String snapshotName);  }### Answer:
@Test public void testGetInstacesStatus() { List<DBStatus> statuses = rdsRaider.getInstancesStatus(Arrays.asList("Test-DB")); Assert.assertNotNull(statuses); Assert.assertEquals(statuses.get(0).getStatus(),"running"); }