Class MapTest

src/test/java/com/google/gson/functional/MapTest.java:43–398

Functional test for Json serialization and deserialization for Maps @author Inderjeet Singh @author Joel Leitch

 * @author Joel Leitch
 */
public class MapTest extends TestCase {
  private Gson gson;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    gson = new Gson();
  }

  public void testMapSerialization() {
    Map<String, Integer> map = new LinkedHashMap<String, Integer>();
    map.put("a", 1);
    map.put("b", 2);
    Type typeOfMap = new TypeToken<Map<String, Integer>>() {}.getType();
    String json = gson.toJson(map, typeOfMap);
    assertTrue(json.contains("\"a\":1"));
    assertTrue(json.contains("\"b\":2"));
  }

  public void testMapDeserialization() {
    String json = "{\"a\":1,\"b\":2}";
    Type typeOfMap = new TypeToken<Map<String,Integer>>(){}.getType();
    Map<String, Integer> target = gson.fromJson(json, typeOfMap);
    assertEquals(1, target.get("a").intValue());
    assertEquals(2, target.get("b").intValue());
  }

  @SuppressWarnings("unchecked")
  public void testRawMapSerialization() {
    Map map = new LinkedHashMap();
    map.put("a", 1);
    map.put("b", "string");
    String json = gson.toJson(map);
    assertTrue(json.contains("\"a\":1"));
    assertTrue(json.contains("\"b\":\"string\""));
  }

  public void testMapSerializationEmpty() {
    Map<String, Integer> map = new LinkedHashMap<String, Integer>();
    Type typeOfMap = new TypeToken<Map<String, Integer>>() {}.getType();
    String json = gson.toJson(map, typeOfMap);
    assertEquals("{}", json);
  }

  public void testMapDeserializationEmpty() {
    Type typeOfMap = new TypeToken<Map<String, Integer>>() {}.getType();
    Map<String, Integer> map = gson.fromJson("{}", typeOfMap);
    assertTrue(map.isEmpty());
  }

  public void testMapSerializationWithNullValue() {
    Map<String, Integer> map = new LinkedHashMap<String, Integer>();
    map.put("abc", null);
    Type typeOfMap = new TypeToken<Map<String, Integer>>() {}.getType();
    String json = gson.toJson(map, typeOfMap);

    // Maps are represented as JSON objects, so ignoring null field
    assertEquals("{}", json);