Disable StandardScriptFactoryTests on Java 15+

This commit disables StandardScriptFactoryTests on Java 15 or higher
since the Nashorn JavaScript engine is no longer part of the JDK.

spring-context/src/test/java/org/springframework/scripting/support/StandardScriptFactoryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -19,6 +19,7 @@ package org.springframework.scripting.support;
 import java.util.Arrays;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledForJreRange;
 
 import org.springframework.aop.support.AopUtils;
 import org.springframework.aop.target.dynamic.Refreshable;
@@ -27,6 +28,7 @@ import org.springframework.context.support.ClassPathXmlApplicationContext;
 import org.springframework.scripting.Messenger;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.condition.JRE.JAVA_15;
 
 /**
  * {@link StandardScriptFactory} (lang:std) tests for JavaScript.
@@ -34,6 +36,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Juergen Hoeller
  * @since 4.2
  */
+@DisabledForJreRange(min = JAVA_15)
 public class StandardScriptFactoryTests {
 
 	@Test