Remove unused static methods in tests

Closes gh-15084

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/HikariDataSourceConfigurationTests.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.jdbc;
 
-import java.lang.reflect.Field;
-
 import javax.sql.DataSource;
 
 import com.zaxxer.hikari.HikariDataSource;
@@ -25,7 +23,6 @@ import org.junit.Test;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
-import org.springframework.util.ReflectionUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -105,11 +102,4 @@ public class HikariDataSourceConfigurationTests {
 				});
 	}
 
-	@SuppressWarnings("unchecked")
-	public static <T> T getField(Class<?> target, String name) {
-		Field field = ReflectionUtils.findField(target, name, null);
-		ReflectionUtils.makeAccessible(field);
-		return (T) ReflectionUtils.getField(field, target);
-	}
-
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/TomcatDataSourceConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.jdbc;
 
-import java.lang.reflect.Field;
-
 import javax.sql.DataSource;
 
 import org.apache.tomcat.jdbc.pool.DataSourceProxy;
@@ -34,7 +32,6 @@ import org.springframework.context.annotation.AnnotationConfigApplicationContext
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.EnableMBeanExport;
-import org.springframework.util.ReflectionUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.fail;
@@ -115,13 +112,6 @@ public class TomcatDataSourceConfigurationTests {
 		assertThat(ds.getValidationInterval()).isEqualTo(3000L);
 	}
 
-	@SuppressWarnings("unchecked")
-	public static <T> T getField(Class<?> target, String name) {
-		Field field = ReflectionUtils.findField(target, name, null);
-		ReflectionUtils.makeAccessible(field);
-		return (T) ReflectionUtils.getField(field, target);
-	}
-
 	@Configuration
 	@EnableConfigurationProperties
 	@EnableMBeanExport