105 lines
3.2 KiB
Java
105 lines
3.2 KiB
Java
/*
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* Copyright (C) 2017 Gson Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal.bind;
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import static com.google.common.truth.Truth.assertThat;
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import com.google.gson.Gson;
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import com.google.gson.TypeAdapter;
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import com.google.gson.internal.$Gson$Types;
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import org.junit.Test;
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/**
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* Test fixes for infinite recursion on {@link $Gson$Types#resolve(java.lang.reflect.Type, Class,
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* java.lang.reflect.Type)}, described at <a href="https://github.com/google/gson/issues/440">Issue
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* #440</a> and similar issues.
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*
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* <p>These tests originally caused {@link StackOverflowError} because of infinite recursion on
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* attempts to resolve generics on types, with intermediate types like {@code Foo2<? extends ? super
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* ? extends ... ? extends A>}
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*/
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public class RecursiveTypesResolveTest {
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@SuppressWarnings("unused")
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private static class Foo1<A> {
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public Foo2<? extends A> foo2;
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}
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@SuppressWarnings("unused")
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private static class Foo2<B> {
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public Foo1<? super B> foo1;
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}
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/** Test simplest case of recursion. */
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@Test
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public void testRecursiveResolveSimple() {
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@SuppressWarnings("rawtypes")
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TypeAdapter<Foo1> adapter = new Gson().getAdapter(Foo1.class);
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assertThat(adapter).isNotNull();
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}
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/** Tests below check the behavior of the methods changed for the fix. */
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@Test
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public void testDoubleSupertype() {
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assertThat($Gson$Types.supertypeOf($Gson$Types.supertypeOf(Number.class)))
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.isEqualTo($Gson$Types.supertypeOf(Number.class));
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}
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@Test
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public void testDoubleSubtype() {
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assertThat($Gson$Types.subtypeOf($Gson$Types.subtypeOf(Number.class)))
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.isEqualTo($Gson$Types.subtypeOf(Number.class));
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}
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@Test
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public void testSuperSubtype() {
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assertThat($Gson$Types.supertypeOf($Gson$Types.subtypeOf(Number.class)))
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.isEqualTo($Gson$Types.subtypeOf(Object.class));
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}
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@Test
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public void testSubSupertype() {
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assertThat($Gson$Types.subtypeOf($Gson$Types.supertypeOf(Number.class)))
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.isEqualTo($Gson$Types.subtypeOf(Object.class));
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}
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/** Tests for recursion while resolving type variables. */
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@SuppressWarnings("unused")
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private static class TestType<X> {
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TestType<? super X> superType;
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}
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@SuppressWarnings("unused")
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private static class TestType2<X, Y> {
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TestType2<? super Y, ? super X> superReversedType;
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}
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@Test
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public void testRecursiveTypeVariablesResolve1() {
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@SuppressWarnings("rawtypes")
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TypeAdapter<TestType> adapter = new Gson().getAdapter(TestType.class);
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assertThat(adapter).isNotNull();
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}
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@Test
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public void testRecursiveTypeVariablesResolve12() {
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@SuppressWarnings("rawtypes")
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TypeAdapter<TestType2> adapter = new Gson().getAdapter(TestType2.class);
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assertThat(adapter).isNotNull();
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}
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}
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