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UnsafeReflectionAccessorTest.java
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UnsafeReflectionAccessorTest.java
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/*
* Copyright (C) 2018 The Gson 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 com.google.gson.internal.reflect;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.lang.reflect.Field;
import java.security.Permission;
import org.junit.Test;
/**
* Unit tests for {@link UnsafeReflectionAccessor}
*
* @author Inderjeet Singh
*/
public class UnsafeReflectionAccessorTest {
@Test
public void testMakeAccessibleWithUnsafe() throws Exception {
UnsafeReflectionAccessor accessor = new UnsafeReflectionAccessor();
Field field = ClassWithPrivateFinalFields.class.getDeclaredField("a");
try {
boolean success = accessor.makeAccessibleWithUnsafe(field);
assertTrue(success);
} catch (Exception e) {
fail("Unsafe didn't work on the JDK");
}
}
@Test
public void testMakeAccessibleWithRestrictiveSecurityManager() throws Exception {
final Permission accessDeclaredMembers = new RuntimePermission("accessDeclaredMembers");
final SecurityManager original = System.getSecurityManager();
SecurityManager restrictiveManager = new SecurityManager() {
@Override
public void checkPermission(Permission perm) {
if (accessDeclaredMembers.equals(perm)) {
throw new SecurityException("nope");
}
}
};
System.setSecurityManager(restrictiveManager);
try {
UnsafeReflectionAccessor accessor = new UnsafeReflectionAccessor();
Field field = ClassWithPrivateFinalFields.class.getDeclaredField("a");
assertFalse("override field should have been inaccessible", accessor.makeAccessibleWithUnsafe(field));
accessor.makeAccessible(field);
} finally {
System.setSecurityManager(original);
}
}
@SuppressWarnings("unused")
private static final class ClassWithPrivateFinalFields {
private final String a;
public ClassWithPrivateFinalFields(String a) {
this.a = a;
}
}
}