From b9516bc77c9de326c90658fd6d903032182db72c Mon Sep 17 00:00:00 2001
From: Andy Wilkinson <wilkinsona@vmware.com>
Date: Mon, 26 Oct 2020 14:41:58 +0000
Subject: [PATCH] Await registration of http.server.requests meter

Previously, the test would make an HTTP request and, as soon as the
response was received, it would check the presence and value of the
http.server.requests meter. This create a race condition between the
meter being registered once the response had been flushed and the
meter's presence being checked. If the check won the race, the test
would fail.

This commit updates the test to wait for up to 5 seconds for the
meter to be present and have a count of 1, matching the single request
that has been made.

Fixes gh-23919
---
 .../spring-boot-actuator-autoconfigure/pom.xml            | 5 +++++
 .../metrics/test/MetricsIntegrationTests.java             | 8 ++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml b/spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml
index 35964f09d2e..c82ddca8408 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml
@@ -546,6 +546,11 @@
 			<artifactId>aspectjrt</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.awaitility</groupId>
+			<artifactId>awaitility</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.eclipse.jetty</groupId>
 			<artifactId>jetty-webapp</artifactId>
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/test/MetricsIntegrationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/test/MetricsIntegrationTests.java
index 921ee3215c6..842c7a0f99f 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/test/MetricsIntegrationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/test/MetricsIntegrationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.test;
 
+import java.time.Duration;
 import java.util.Collections;
 import java.util.Map;
 import java.util.Set;
@@ -71,6 +72,7 @@ import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.client.RestTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.waitAtMost;
 import static org.springframework.test.web.client.ExpectedCount.once;
 import static org.springframework.test.web.client.match.MockRestRequestMatchers.method;
 import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
@@ -110,7 +112,9 @@ class MetricsIntegrationTests {
 	@Test
 	void requestMappingIsInstrumented() {
 		this.loopback.getForObject("/api/people", Set.class);
-		assertThat(this.registry.get("http.server.requests").timer().count()).isEqualTo(1);
+		waitAtMost(Duration.ofSeconds(5)).untilAsserted(
+				() -> assertThat(this.registry.get("http.server.requests").timer().count()).isEqualTo(1));
+
 	}
 
 	@Test