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

/*
 * Copyright (C) 2008 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 java.math.BigDecimal;
import java.math.BigInteger;

import junit.framework.TestCase;

/**
 * Unit test for the {@link JsonPrimitive} class.
 * 
 * @author Joel Leitch
 */
public class JsonPrimitiveTest extends TestCase {

  public void testBoolean() throws Exception {
    JsonPrimitive json = new JsonPrimitive(Boolean.TRUE);
    
    assertTrue(json.isBoolean());
    assertTrue(json.getAsBoolean());
  }
  
  public void testParsingStringAsBoolean() throws Exception {
    JsonPrimitive json = new JsonPrimitive("true");
    
    assertFalse(json.isBoolean());
    assertTrue(json.getAsBoolean());
  }
  
  public void testParsingStringAsNumber() throws Exception {
    JsonPrimitive json = new JsonPrimitive("1");

    assertFalse(json.isNumber());
    assertEquals(1D, json.getAsDouble(), 0.00001);
    assertEquals(1F, json.getAsFloat(), 0.00001);
    assertEquals(1, json.getAsInt());
    assertEquals(1L, json.getAsLong());
    assertEquals((short) 1, json.getAsShort());
    assertEquals((byte) 1, json.getAsByte());
    assertEquals(new BigInteger("1"), json.getAsBigInteger());
    assertEquals(new BigDecimal("1"), json.getAsBigDecimal());
  }
  
  public void testStringsAndChar() throws Exception {
    JsonPrimitive json = new JsonPrimitive("abc");
    assertTrue(json.isString());
    assertEquals('a', json.getAsCharacter());
    assertEquals("abc", json.getAsString());
    
    json = new JsonPrimitive('z');
    assertTrue(json.isString());
    assertEquals('z', json.getAsCharacter());
    assertEquals("z", json.getAsString());
  }
  
  public void testExponential() throws Exception {
    JsonPrimitive json = new JsonPrimitive("1E+7");

    assertEquals(new BigDecimal("1E+7"), json.getAsBigDecimal());
    assertEquals(new Double("1E+7"), json.getAsDouble(), 0.00001);
    assertEquals(new Float("1E+7"), json.getAsDouble(), 0.00001);
    
    try {
      json.getAsInt();
      fail("Integers can not handle exponents like this.");
    } catch (NumberFormatException expected) { }
  }
  
  public void testValidJsonOnToString() throws Exception {
    JsonPrimitive json = new JsonPrimitive("Some\nEscaped\nValue");
    assertEquals("\"Some\\nEscaped\\nValue\"", json.toString());
    
    json = new JsonPrimitive(new BigDecimal("1.333"));
    assertEquals("1.333", json.toString());
  }
}