### Question:
Group extends DynamicModel { public InstanceTemplate getReferenceInstanceTemplate() { return getReferenceInstanceConfiguration().getTemplate(); } Group(String name, InstanceGroupType type, Collection<CloudInstance> instances, Security security, CloudInstance skeleton,
            InstanceAuthentication instanceAuthentication, String loginUserName, String publicKey,
            int rootVolumeSize, Optional<CloudFileSystemView> identity);  Group(String name, InstanceGroupType type, Collection<CloudInstance> instances, Security security, CloudInstance skeleton,
            Map<String, Object> parameters, InstanceAuthentication instanceAuthentication, String loginUserName,
            String publicKey, int rootVolumeSize, Optional<CloudFileSystemView> identity); CloudInstance getReferenceInstanceConfiguration(); InstanceTemplate getReferenceInstanceTemplate(); String getName(); InstanceGroupType getType(); List<CloudInstance> getInstances(); Integer getInstancesSize(); Security getSecurity(); String getPublicKey(); String getLoginUserName(); InstanceAuthentication getInstanceAuthentication(); int getRootVolumeSize(); Optional<CloudFileSystemView> getIdentity(); @Override String toString();  }### Answer:
@Test void getReferenceInstanceTemplateTestWhenNoInstancesAndValidSkeleton() { CloudInstance cloudInstance = createCloudInstance(); Group group = createGroup(emptyList(), cloudInstance); InstanceTemplate result = group.getReferenceInstanceTemplate(); assertThat(result).isSameAs(cloudInstance.getTemplate()); }
@Test void getReferenceInstanceTemplateTestWhenSingleInstanceAndSkeletonIsNull() { CloudInstance cloudInstance = createCloudInstance(); Group group = createGroup(List.of(cloudInstance), null); InstanceTemplate result = group.getReferenceInstanceTemplate(); assertThat(result).isSameAs(cloudInstance.getTemplate()); }
@Test void getReferenceInstanceTemplateTestWhenSingleInstanceAndValidSkeleton() { CloudInstance cloudInstance = createCloudInstance(); Group group = createGroup(List.of(cloudInstance), createCloudInstance()); InstanceTemplate result = group.getReferenceInstanceTemplate(); assertThat(result).isSameAs(cloudInstance.getTemplate()); }
@Test void getReferenceInstanceTemplateTestWhenMultipleInstances() { CloudInstance cloudInstanceFirst = createCloudInstance(); Group group = createGroup(List.of(cloudInstanceFirst, createCloudInstance()), null); InstanceTemplate result = group.getReferenceInstanceTemplate(); assertThat(result).isSameAs(cloudInstanceFirst.getTemplate()); }