Add health indicator for reactive MongoDB

See gh-11997

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mongo/MongoReactiveHealthIndicatorTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2012-2018 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
+ *
+ *      http://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.actuate.mongo;
+
+import com.mongodb.MongoException;
+import org.bson.Document;
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Status;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link MongoReactiveHealthIndicator}.
+ *
+ * @author Yulin Qin
+ */
+public class MongoReactiveHealthIndicatorTest {
+
+	@Test
+	public void testMongoIsUp() throws Exception {
+		Document document = mock(Document.class);
+		ReactiveMongoTemplate reactiveMongoTemplate = mock(ReactiveMongoTemplate.class);
+		given(reactiveMongoTemplate.executeCommand("{ buildInfo: 1 }")).willReturn(Mono.just(document));
+		given(document.getString("version")).willReturn("2.6.4");
+
+		MongoReactiveHealthIndicator mongoReactiveHealthIndicator = new MongoReactiveHealthIndicator(reactiveMongoTemplate);
+		Mono<Health> health = mongoReactiveHealthIndicator.health();
+		StepVerifier.create(health).consumeNextWith((h) -> {
+			assertThat(h.getStatus()).isEqualTo(Status.UP);
+			assertThat(h.getDetails()).containsOnlyKeys("version");
+			assertThat(h.getDetails().get("version")).isEqualTo("2.6.4");
+		}).verifyComplete();
+	}
+
+	@Test
+	public void testMongoIsDown() throws Exception {
+		ReactiveMongoTemplate reactiveMongoTemplate = mock(ReactiveMongoTemplate.class);
+		given(reactiveMongoTemplate.executeCommand("{ buildInfo: 1 }")).willThrow(new MongoException("Connection failed"));
+
+		MongoReactiveHealthIndicator mongoReactiveHealthIndicator = new MongoReactiveHealthIndicator(reactiveMongoTemplate);
+		Mono<Health> health = mongoReactiveHealthIndicator.health();
+		StepVerifier.create(health).consumeNextWith((h) -> {
+			assertThat(h.getStatus()).isEqualTo(Status.DOWN);
+			assertThat(h.getDetails()).containsOnlyKeys("error");
+			assertThat(h.getDetails().get("error")).isEqualTo("Connection failed");
+		}).verifyComplete();
+
+	}
+}