### Question:
AWSXRayRecorder { @Nullable public String currentFormattedId() { SegmentContext context = getSegmentContext(); if (context == null) { return null; } Entity current = context.getTraceEntity(); if (current != null) { TraceID traceId = current.getParentSegment().getTraceId(); String entityId = current.getId(); return traceId.toString() + "@" + entityId; } else { contextMissingStrategy.contextMissing("Failed to get current formatted ID: segment cannot be found.", SegmentNotFoundException.class); return null; } } AWSXRayRecorder(); boolean sendSegment(Segment segment); boolean sendSubsegment(Subsegment subsegment); @Nullable R createSegment(String name, Function<Segment, @Nullable R> function); void createSegment(String name, Consumer<Segment> consumer); @Nullable R createSegment(String name, Supplier<R> supplier); void createSegment(String name, Runnable runnable); @Nullable R createSubsegment(String name, Function<Subsegment, @Nullable R> function); void createSubsegment(String name, Consumer<Subsegment> consumer); @Nullable R createSubsegment(String name, Supplier<R> supplier); void createSubsegment(String name, Runnable runnable); Segment beginSegment(String name); Segment beginSegmentWithSampling(String name); Segment beginSegment(String name, TraceID traceId, @Nullable String parentId); Segment beginNoOpSegment(); Segment beginNoOpSegment(TraceID traceID); @Deprecated Segment beginDummySegment(); @Deprecated Segment beginDummySegment(String name, TraceID traceId); @Deprecated Segment beginDummySegment(TraceID traceId); void endSegment(); void endSubsegment(Subsegment subsegment); Subsegment beginSubsegment(String name); void endSubsegment(); @Nullable Segment getCurrentSegment(); Optional<Segment> getCurrentSegmentOptional(); @Nullable Subsegment getCurrentSubsegment(); Optional<Subsegment> getCurrentSubsegmentOptional(); @Deprecated void injectThreadLocal(Entity entity); @Deprecated @Nullable Entity getThreadLocal(); @Deprecated void clearThreadLocal(); void setTraceEntity(@Nullable Entity entity); @Nullable Entity getTraceEntity(); void clearTraceEntity(); void putRuntimeContext(String key, Object value); void addAllLogReferences(Set<AWSLogReference> logReferences); SamplingStrategy getSamplingStrategy(); void setSamplingStrategy(SamplingStrategy samplingStrategy); StreamingStrategy getStreamingStrategy(); void setStreamingStrategy(StreamingStrategy streamingStrategy); PrioritizationStrategy getPrioritizationStrategy(); void setPrioritizationStrategy(PrioritizationStrategy prioritizationStrategy); ThrowableSerializationStrategy getThrowableSerializationStrategy(); void setThrowableSerializationStrategy(ThrowableSerializationStrategy throwableSerializationStrategy); ContextMissingStrategy getContextMissingStrategy(); void setContextMissingStrategy(ContextMissingStrategy contextMissingStrategy); SegmentContextResolverChain getSegmentContextResolverChain(); void setSegmentContextResolverChain(SegmentContextResolverChain segmentContextResolverChain); Emitter getEmitter(); void setEmitter(Emitter emitter); ArrayList<SegmentListener> getSegmentListeners(); void addSegmentListener(SegmentListener segmentListener); void addAllSegmentListeners(Collection<SegmentListener> segmentListeners); Map<String, Object> getAwsRuntimeContext(); Map<String, Object> getServiceRuntimeContext(); @Nullable String getOrigin(); void setOrigin(String origin); final void useFastIdGenerator(); final void useSecureIdGenerator(); final IdGenerator getIdGenerator(); boolean forceSamplingOfCurrentSegment(); @Nullable String currentEntityId(); @Nullable TraceID currentTraceId(); @Nullable String currentFormattedId();  }### Answer:
@Test public void testCurrentFormattedId() { TraceID traceId = TraceID.fromString("1-5759e988-bd862e3fe1be46a994272793"); String entityId = "123456789"; Segment seg = AWSXRay.beginSegment("test", traceId, "FakeParentId"); seg.setId(entityId); Assert.assertEquals(traceId.toString() + "@" + entityId, AWSXRay.currentFormattedId()); }