### Question:
GcpComputePlatform extends Platform implements SshBasedExperiment<GcpComputeInstanceContainer> { public String simulateMaintenance (GcpComputeInstanceContainer container) { log.info("Simulating Host Maintenance for Google Compute instance {}", v(DATADOG_CONTAINER_KEY, container)); final Operation operation = getInstanceClient().simulateMaintenanceEventInstance( getProjectZoneInstanceNameOfContainer(container, getProjectName())); return operation.getSelfLink(); }  void setRoutableCIDRBlocks(Collection<String> routableCIDRBlocks); @Override ApiStatus getApiStatus(); @Override PlatformLevel getPlatformLevel(); @Override PlatformHealth getPlatformHealth(); Collection<Items> getIncludeFilter(); void setIncludeFilter(Map<String, String> includeFilter); Collection<Items> getExcludeFilter(); void setExcludeFilter(Map<String, String> excludeFilter); @Override boolean isContainerRecycled(Container container); String stopInstance(GcpComputeInstanceContainer container); ContainerHealth isContainerRunning(GcpComputeInstanceContainer gcpComputeInstanceContainer); String simulateMaintenance(GcpComputeInstanceContainer container); String setTags(GcpComputeInstanceContainer container, List<String> tags); String setTagsSafe(GcpComputeInstanceContainer container, List<String> newTags, String oldFingerprint); boolean isContainerGroupAtCapacity(GcpComputeInstanceContainer container); boolean checkTags(GcpComputeInstanceContainer container, List<String> expectedTags); void startInstance(GcpComputeInstanceContainer container); String restartContainer(GcpComputeInstanceContainer container); String getBestEndpoint(String privateIPAddress, String publicIPAddress); boolean isAddressRoutable(String privateIPAddress); String getLatestInstanceId(String instanceName, String zone); Fingerprint<List<String>> getFirewallTags(GcpComputeInstanceContainer container); void setProjectId(String projectId); @Override String getEndpoint(GcpComputeInstanceContainer container); @Override SSHCredentials getSshCredentials(GcpComputeInstanceContainer container); @Override String getRunningDirectory(); @Override void recycleContainer(GcpComputeInstanceContainer container); String recreateInstanceInInstanceGroup(GcpComputeInstanceContainer container); boolean isOperationComplete(String operationId);  }### Answer:
@Test public void simulateMaintenance () { String zone = "my-zone"; String uniqueId = "my-unique-id"; GcpComputeInstanceContainer container = GcpComputeInstanceContainer.builder() .withUniqueIdentifier(uniqueId) .withZone(zone) .build(); ProjectZoneInstanceName instanceName = ProjectZoneInstanceName.newBuilder() .setProject(MY_AWESOME_PROJECT) .setZone(zone) .setInstance(uniqueId) .build(); Operation operation = mock(Operation.class); doReturn(operation).when(instanceClient).simulateMaintenanceEventInstance(instanceName); doReturn("self-link").when(operation).getSelfLink(); assertEquals("self-link", gcpComputePlatform.simulateMaintenance(container)); }