Remove unused fields in tests

See gh-20926

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

 /*
- * 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.
@@ -18,12 +18,10 @@ package org.springframework.boot.actuate.mongo;
 
 import com.mongodb.MongoException;
 import org.bson.Document;
-import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.actuate.health.Health;
 import org.springframework.boot.actuate.health.Status;
-import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.data.mongodb.core.MongoTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -38,15 +36,6 @@ import static org.mockito.Mockito.verify;
  */
 class MongoHealthIndicatorTests {
 
-	private AnnotationConfigApplicationContext context;
-
-	@AfterEach
-	void close() {
-		if (this.context != null) {
-			this.context.close();
-		}
-	}
-
 	@Test
 	void mongoIsUp() {
 		Document commandResult = mock(Document.class);

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/solr/SolrHealthIndicatorTests.java

 /*
- * 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.
@@ -23,12 +23,10 @@ import org.apache.solr.client.solrj.impl.BaseHttpSolrClient.RemoteSolrException;
 import org.apache.solr.client.solrj.request.CoreAdminRequest;
 import org.apache.solr.client.solrj.response.SolrPingResponse;
 import org.apache.solr.common.util.NamedList;
-import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.actuate.health.Health;
 import org.springframework.boot.actuate.health.Status;
-import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
@@ -48,15 +46,6 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
  */
 class SolrHealthIndicatorTests {
 
-	private AnnotationConfigApplicationContext context;
-
-	@AfterEach
-	void close() {
-		if (this.context != null) {
-			this.context.close();
-		}
-	}
-
 	@Test
 	void healthWhenSolrStatusUpAndBaseUrlPointsToRootReturnsUp() throws Exception {
 		SolrClient solrClient = mock(SolrClient.class);

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/DockerApiTests.java

@@ -368,12 +368,6 @@ class DockerApiTests {
 
 		private VolumeApi api;
 
-		@Captor
-		private ArgumentCaptor<IOConsumer<OutputStream>> writer;
-
-		@Mock
-		private UpdateListener<LogUpdateEvent> logListener;
-
 		@BeforeEach
 		void setup() {
 			MockitoAnnotations.initMocks(this);