Add support to @ClassPathExclusions for excluding packages

Closes gh-36120

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/test/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathExtensionExclusionsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2023 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 +19,8 @@ package org.springframework.boot.testsupport.classpath;
 import org.hamcrest.Matcher;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.util.ClassUtils;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.Matchers.isA;
 
@@ -26,22 +28,34 @@ import static org.hamcrest.Matchers.isA;
  * Tests for {@link ModifiedClassPathExtension} excluding entries from the class path.
  *
  * @author Christoph Dreis
+ * @author Andy Wilkinson
  */
-@ClassPathExclusions("hibernate-validator-*.jar")
+@ClassPathExclusions(files = "hibernate-validator-*.jar", packages = "java.net.http")
 class ModifiedClassPathExtensionExclusionsTests {
 
 	private static final String EXCLUDED_RESOURCE = "META-INF/services/jakarta.validation.spi.ValidationProvider";
 
 	@Test
-	void entriesAreFilteredFromTestClassClassLoader() {
+	void fileExclusionsAreFilteredFromTestClassClassLoader() {
 		assertThat(getClass().getClassLoader().getResource(EXCLUDED_RESOURCE)).isNull();
 	}
 
 	@Test
-	void entriesAreFilteredFromThreadContextClassLoader() {
+	void fileExclusionsAreFilteredFromThreadContextClassLoader() {
 		assertThat(Thread.currentThread().getContextClassLoader().getResource(EXCLUDED_RESOURCE)).isNull();
 	}
 
+	@Test
+	void packageExclusionsAreFilteredFromTestClassClassLoader() {
+		assertThat(ClassUtils.isPresent("java.net.http.HttpClient", getClass().getClassLoader())).isFalse();
+	}
+
+	@Test
+	void packageExclusionsAreFilteredFromThreadContextClassLoader() {
+		assertThat(ClassUtils.isPresent("java.net.http.HttpClient", Thread.currentThread().getContextClassLoader()))
+			.isFalse();
+	}
+
 	@Test
 	void testsThatUseHamcrestWorkCorrectly() {
 		Matcher<IllegalStateException> matcher = isA(IllegalStateException.class);