converter/serializer/src/test/java/org/apache/felix/serializer/impl/json/JsonSerializationTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.felix.serializer.impl.json;

import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class JsonSerializationTest {
    @Test
    @SuppressWarnings("unchecked")
    public void testComplexMapSerialization() {
        Map<String, Object> m = new LinkedHashMap<>();
        m.put("sKey", "a string");
        m.put("iKey", 42);
        m.put("bKey",  true);
        m.put("noKey", null);
        m.put("simpleArray", new int[] {1,2,3});

        Map<String, Object> m1 = new LinkedHashMap<>();
        m1.put("a", 1L);
        m1.put("b", "hello");
        m.put("simpleObject", m1);

        String expected = "{\"sKey\":\"a string\","
                + "\"iKey\":42,"
                + "\"bKey\":true,"
                + "\"noKey\":null,"
                + "\"simpleArray\":[1,2,3],"
                + "\"simpleObject\":{\"a\":1,\"b\":\"hello\"}}";
        assertEquals(expected, new JsonSerializerImpl().serialize(m).toString());

        Map<String, Object> dm = new JsonSerializerImpl().deserialize(Map.class).from(expected);
        Map<String, Object> expected2 = new LinkedHashMap<>();
        expected2.put("sKey", "a string");
        expected2.put("iKey", 42L);
        expected2.put("bKey",  true);
        expected2.put("noKey", null);
        expected2.put("simpleArray", Arrays.asList(1L,2L,3L));
        expected2.put("simpleObject", m1);
        assertEquals(expected2, dm);
    }

    @Test
    public void testComplexMapSerialization2() {
        Map<String, Object> m2 = new LinkedHashMap<>();
        m2.put("yes", Boolean.TRUE);
        m2.put("no", Collections.singletonMap("maybe", false));

        Map<String, Object> cm = new LinkedHashMap<>();
        cm.put("list", Arrays.asList(
                Collections.singletonMap("x", "y"),
                Collections.singletonMap("x", "b")));
        cm.put("embedded", m2);

        String expected = "{\"list\":[{\"x\":\"y\"},{\"x\":\"b\"}],"
                + "\"embedded\":"
                + "{\"yes\":true,\"no\":{\"maybe\":false}}}";
        assertEquals(expected, new JsonSerializerImpl().serialize(cm).toString());
    }

    @Test
    public void testEmptyMapSerialization() {
        Map<?,?> m = new LinkedHashMap<>();
        String expected = "{}";
        assertEquals(expected, new JsonSerializerImpl().serialize(m).toString());
        Map<?,?> m2 = new JsonSerializerImpl().deserialize(Map.class).from(expected);
        assertEquals(m, m2);
    }
}