### Question:
MessageBusStatus { public MessageBusStatus increasePublishedMessagesPerMicroservice(String microservice) { this.processedMessages++; Long n = this.publishedMessagesPerMicroservice.get(microservice); if (n == null) n = 0L; this.publishedMessagesPerMicroservice.put(microservice, n + 1); return this; } MessageBusStatus(); long getProcessedMessages(); Long getPublishedMessagesPerMicroservice(String microservice); Map<String, Long> getPublishedMessagesPerMicroservice(); MessageBusStatus increasePublishedMessagesPerMicroservice(String microservice); float getAverageSpeed(); MessageBusStatus setAverageSpeed(float averageSpeed); void removePublishedMessagesPerMicroservice(String microservice); String getJsonPublishedMessagesPerMicroservice();  }### Answer:
@Test public void testIncreasePublishedMessagesPerMicroservice() { assertEquals(1, messageBusStatus.increasePublishedMessagesPerMicroservice(null).getProcessedMessages()); assertEquals(2, messageBusStatus.increasePublishedMessagesPerMicroservice("microservice").getProcessedMessages()); }