Merge branch '2.1.x' into 2.2.x

Closes gh-21091

spring-boot-project/spring-boot-docs/src/test/java/org/springframework/boot/docs/actuate/metrics/MetricsHealthMicrometerExportExampleTests.java

@@ -0,0 +1,78 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.actuate.metrics;
+
+import io.micrometer.core.instrument.Gauge;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.autoconfigure.health.HealthContributorAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.health.HealthEndpointAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link MetricsHealthMicrometerExportExample}.
+ *
+ * @author Phillip Webb
+ */
+@SpringBootTest
+public class MetricsHealthMicrometerExportExampleTests {
+
+	@Autowired
+	private MeterRegistry registry;
+
+	@Test
+	void registryExportsHealth() throws Exception {
+		Gauge gauge = this.registry.get("health").gauge();
+		assertThat(gauge.value()).isEqualTo(2);
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@Import(MetricsHealthMicrometerExportExample.HealthMetricsConfiguration.class)
+	@ImportAutoConfiguration(classes = { HealthContributorAutoConfiguration.class, MetricsAutoConfiguration.class,
+			HealthEndpointAutoConfiguration.class })
+	static class Config {
+
+		@Bean
+		MetricsHealthMicrometerExportExample example() {
+			return new MetricsHealthMicrometerExportExample();
+		}
+
+		@Bean
+		SimpleMeterRegistry simpleMeterRegistry() {
+			return new SimpleMeterRegistry();
+		}
+
+		@Bean
+		HealthIndicator outOfService() {
+			return () -> new Health.Builder().outOfService().build();
+		}
+
+	}
+
+}