Set HealthStatusUpdateHAndler to public

core/src/main/java/com/linecorp/armeria/server/healthcheck/HealthStatusUpdateHandler.java

@@ -39,7 +39,7 @@
  * Handler which updates the healthiness of the {@link Server}. Supports {@code PUT}, {@code POST} and
  * {@code PATCH} requests and tells if the {@link Server} needs update its {@link HealthStatus}.
  */
-enum HealthStatusUpdateHandler implements HealthCheckUpdateHandler {
+public enum HealthStatusUpdateHandler implements HealthCheckUpdateHandler {
 
  INSTANCE;
 

core/src/test/java/com/linecorp/armeria/server/healthcheck/HealthCheckServiceTest.java

@@ -32,7 +32,6 @@
 import java.nio.charset.StandardCharsets;
 import java.time.Duration;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
@@ -527,15 +526,16 @@ void checkStatus(String status) {
  }
 
  @Test
- void pollSameHealthState() throws ExecutionException, InterruptedException {
+ void pollHealthState() throws Exception {
  checker.setHealthStatus(HealthStatus.HEALTHY);
  final CompletableFuture<AggregatedHttpResponse> f = sendLongPollingGet("healthy", "/hc");
  assertThatThrownBy(() -> f.get(1, TimeUnit.SECONDS)).isInstanceOf(TimeoutException.class);
 
- // Because we did not poll for specific status, no response is sent.
+ // Because the health state is unchanged(from healthy to healthy), response is not received.
  checker.setHealthStatus(HealthStatus.DEGRADED);
  assertThatThrownBy(() -> f.get(1, TimeUnit.SECONDS)).isInstanceOf(TimeoutException.class);
 
+ // Because the health state is changed(from healthy to unhealthy), response is received.
  checker.setHealthStatus(HealthStatus.UNHEALTHY);
  assertThat(f.get().contentUtf8()).isEqualTo(
  "{\"healthy\":" + "false" + ",\"status\":\"" + "UNHEALTHY" + "\"}");