79 lines
2.8 KiB
Java
79 lines
2.8 KiB
Java
/*
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* Copyright (C) 2012 Google Inc.
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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;
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import static com.google.common.truth.Truth.assertThat;
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import com.google.gson.reflect.TypeToken;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.lang.reflect.Type;
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import java.util.List;
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import java.util.Map;
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import org.junit.Test;
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/**
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* Check that Gson doesn't return non-serializable data types.
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*
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* @author Jesse Wilson
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*/
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public final class JavaSerializationTest {
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private final Gson gson = new Gson();
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@Test
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public void testMapIsSerializable() throws Exception {
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Type type = new TypeToken<Map<String, Integer>>() {}.getType();
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Map<String, Integer> map = gson.fromJson("{\"b\":1,\"c\":2,\"a\":3}", type);
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Map<String, Integer> serialized = serializedCopy(map);
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assertThat(serialized).isEqualTo(map);
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// Also check that the iteration order is retained.
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assertThat(serialized.keySet()).containsExactly("b", "c", "a").inOrder();
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}
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@Test
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public void testListIsSerializable() throws Exception {
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Type type = new TypeToken<List<String>>() {}.getType();
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List<String> list = gson.fromJson("[\"a\",\"b\",\"c\"]", type);
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List<String> serialized = serializedCopy(list);
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assertThat(serialized).isEqualTo(list);
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}
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@Test
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public void testNumberIsSerializable() throws Exception {
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Type type = new TypeToken<List<Number>>() {}.getType();
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List<Number> list = gson.fromJson("[1,3.14,6.673e-11]", type);
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List<Number> serialized = serializedCopy(list);
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assertThat(serialized.get(0).doubleValue()).isEqualTo(1.0);
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assertThat(serialized.get(1).doubleValue()).isEqualTo(3.14);
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assertThat(serialized.get(2).doubleValue()).isEqualTo(6.673e-11);
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}
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@SuppressWarnings("unchecked") // Serialization promises to return the same type.
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private <T> T serializedCopy(T object) throws IOException, ClassNotFoundException {
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ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
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ObjectOutputStream out = new ObjectOutputStream(bytesOut);
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out.writeObject(object);
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out.close();
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ByteArrayInputStream bytesIn = new ByteArrayInputStream(bytesOut.toByteArray());
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ObjectInputStream in = new ObjectInputStream(bytesIn);
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return (T) in.readObject();
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}
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}
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