gson-comments/gson/src/test/java/com/google/gson/JsonParserTest.java

/*
 * Copyright (C) 2009 Google Inc.
 *
 * 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;

import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.stream.JsonReader;
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.StringReader;
import junit.framework.TestCase;

/**
 * Unit test for {@link JsonParser}
 * 
 * @author Inderjeet Singh
 */
public class JsonParserTest extends TestCase {
  
  private JsonParser parser;
  
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    parser = new JsonParser();
  }
  
  public void testParseString() {
    String json = "{a:10,b:'c'}";
    JsonElement e = parser.parse(json);
    assertTrue(e.isJsonObject());
    assertEquals(10, e.getAsJsonObject().get("a").getAsInt());
    assertEquals("c", e.getAsJsonObject().get("b").getAsString());
  }
  
  public void testParseEmptyString() {
    JsonElement e = parser.parse("\"   \"");
    assertTrue(e.isJsonPrimitive());
    assertEquals("   ", e.getAsString());
  }

  public void testParseEmptyWhitespaceInput() {
    JsonElement e = parser.parse("     ");
    assertTrue(e.isJsonNull());
  }
  
  public void testParseMixedArray() {
    String json = "[{},13,\"stringValue\"]";
    JsonElement e = parser.parse(json);
    assertTrue(e.isJsonArray());
    
    JsonArray  array = e.getAsJsonArray();
    assertEquals("{}", array.get(0).toString());
    assertEquals(13, array.get(1).getAsInt());
    assertEquals("stringValue", array.get(2).getAsString());
  }

  public void testParseReader() {
    StringReader reader = new StringReader("{a:10,b:'c'}");
    JsonElement e = parser.parse(reader);
    assertTrue(e.isJsonObject());
    assertEquals(10, e.getAsJsonObject().get("a").getAsInt());
    assertEquals("c", e.getAsJsonObject().get("b").getAsString());
  }
  
  public void testReadWriteTwoObjects() throws Exception {
    Gson gson= new Gson();
    CharArrayWriter writer= new CharArrayWriter();
    BagOfPrimitives expectedOne = new BagOfPrimitives(1, 1, true, "one");
    writer.write(gson.toJson(expectedOne).toCharArray());
    BagOfPrimitives expectedTwo = new BagOfPrimitives(2, 2, false, "two");
    writer.write(gson.toJson(expectedTwo).toCharArray());
    CharArrayReader reader = new CharArrayReader(writer.toCharArray());
  
    JsonReader parser = new JsonReader(reader);
    parser.setLenient(true);
    JsonElement element1 = Streams.parse(parser);
    JsonElement element2 = Streams.parse(parser);
    BagOfPrimitives actualOne = gson.fromJson(element1, BagOfPrimitives.class);
    assertEquals("one", actualOne.stringValue);
    BagOfPrimitives actualTwo = gson.fromJson(element2, BagOfPrimitives.class);
    assertEquals("two", actualTwo.stringValue);
  }
}