Add FilteredClassLoader

Add `FilteredClassLoader` to replace `HideClassesClassLoader` and
`HidePackagesClassLoader`.

Fixes gh-10303

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/FilteredClassLoaderTests.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2012-2017 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.test.context;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link FilteredClassLoader}.
+ *
+ * @author Phillip Webb
+ */
+public class FilteredClassLoaderTests {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	@Test
+	public void loadClassWhenFilteredOnPackageShouldThrowClassNotFound()
+			throws Exception {
+		FilteredClassLoader classLoader = new FilteredClassLoader(
+				FilteredClassLoaderTests.class.getPackage().getName());
+		this.thrown.expect(ClassNotFoundException.class);
+		classLoader.loadClass(getClass().getName());
+		classLoader.close();
+	}
+
+	@Test
+	public void loadClassWhenFilteredOnClassShouldThrowClassNotFound() throws Exception {
+		FilteredClassLoader classLoader = new FilteredClassLoader(
+				FilteredClassLoaderTests.class);
+		this.thrown.expect(ClassNotFoundException.class);
+		classLoader.loadClass(getClass().getName());
+		classLoader.close();
+	}
+
+	@Test
+	public void loadClassWhenNotFilteredShouldLoadClass() throws Exception {
+		FilteredClassLoader classLoader = new FilteredClassLoader((className) -> false);
+		Class<?> loaded = classLoader.loadClass(getClass().getName());
+		assertThat(loaded.getName()).isEqualTo(getClass().getName());
+		classLoader.close();
+	}
+
+}

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/runner/AbstractApplicationContextRunnerTests.java

@@ -25,7 +25,7 @@ import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
 import org.springframework.boot.context.annotation.UserConfigurations;
-import org.springframework.boot.test.context.HidePackagesClassLoader;
+import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.assertj.ApplicationContextAssertProvider;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
@@ -34,7 +34,7 @@ import org.springframework.core.env.Environment;
 import org.springframework.util.ClassUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.fail;
+import static org.junit.Assert.fail;
 
 /**
  * Abstract tests for {@link AbstractApplicationContextRunner} implementations.
@@ -148,8 +148,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 
 	@Test
 	public void runWithClassLoaderShouldSetClassLoader() throws Exception {
-		get().withClassLoader(
-				new HidePackagesClassLoader(Gson.class.getPackage().getName()))
+		get().withClassLoader(new FilteredClassLoader(Gson.class.getPackage().getName()))
 				.run((context) -> {
 					try {
 						ClassUtils.forName(Gson.class.getName(),