### Question:
AwsEC2Platform extends Platform implements SshBasedExperiment<AwsEC2Container> { @Override public PlatformHealth getPlatformHealth () { Stream<Instance> instances = getInstanceStream(); Set<InstanceState> instanceStates = instances.map(Instance::getState).collect(Collectors.toSet()); Set<Integer> instanceStateCodes = instanceStates.stream().map(InstanceState::getCode).collect(Collectors.toSet()); for (int state : AwsEC2Constants.getAwsUnhealthyCodes()) { if (instanceStateCodes.contains(state)) return PlatformHealth.DEGRADED; } return PlatformHealth.OK; } @Autowired  AwsEC2Platform(AmazonEC2 amazonEC2, ContainerManager containerManager, AwsEC2SelfAwareness awsEC2SelfAwareness); private  AwsEC2Platform(); void setFilter(@NotNull Map<String, List<String>> filter); void setGroupingTags(List<String> groupingTags); void setSSHPrivateKeys(@NotNull Map<String, String> sshPrivateKeys); Map<String, String> getImageIdToUsernameMap(); void setImageIdToUsernameMap(Map<String, String> imageIdToUsernameMap); @Override ApiStatus getApiStatus(); @JsonIgnore Collection<SubnetUtils.SubnetInfo> getRoutableCidrBlocks(); void setRoutableCidrBlocks(Collection<String> routableCidrBlocks); boolean isAddressRoutable(String privateIPAddress); @Override PlatformLevel getPlatformLevel(); @Override PlatformHealth getPlatformHealth(); @Override List<Container> generateRoster(); @Override boolean isContainerRecycled(Container container); ContainerHealth checkHealth(String instanceId); void stopInstance(String... instanceIds); void terminateInstance(String... instanceIds); void startInstance(String... instanceIds); void restartInstance(String... instanceIds); void setSecurityGroupIds(String networkInterfaceId, Collection<String> securityGroupIds); String getChaosSecurityGroupForInstance(String instanceId); boolean isContainerTerminated(String instanceId); boolean isAutoscalingGroupAtDesiredInstances(String autoScalingGroupName); boolean hasKey(String keyName); @Override void recycleContainer(AwsEC2Container container); void triggerAutoscalingUnhealthy(String instanceId); @Override String getEndpoint(AwsEC2Container container); @Override SSHCredentials getSshCredentials(AwsEC2Container container); boolean isStarted(AwsEC2Container awsEC2Container); Map<String, Set<String>> getNetworkInterfaceToSecurityGroupsMap(String instanceId); boolean verifySecurityGroupIdsOfNetworkInterfaceMap(String instanceId, Map<String, Set<String>> originalSecurityGroups);  }### Answer:
@Test public void getPlatformHealth () { List<Instance> instanceList = Collections.singletonList(instance); List<Reservation> reservationList = Collections.singletonList(reservation); when(amazonEC2.describeInstances(any(DescribeInstancesRequest.class))).thenReturn(describeInstancesResult); when(describeInstancesResult.getReservations()).thenReturn(reservationList); when(reservation.getInstances()).thenReturn(instanceList); when(instance.getState()).thenReturn(new InstanceState().withCode(0)); assertEquals(PlatformHealth.DEGRADED, awsEC2Platform.getPlatformHealth()); when(instance.getState()).thenReturn(new InstanceState().withCode(16)); assertEquals(PlatformHealth.OK, awsEC2Platform.getPlatformHealth()); }