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Java example source code file (JsonPrimitiveTest.java)

This example Java source code file (JsonPrimitiveTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bigdecimal, biginteger, byte, double, exception, integers, jsonprimitive, jsonprimitivetest, long, math, numberformatexception, primitives, short, some\nescaped\nvalue, testcase

The JsonPrimitiveTest.java Java example source code

/*
 * 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 com.google.gson.common.MoreAsserts;

import junit.framework.TestCase;

import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * 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());

    // Extra support for booleans
    json = new JsonPrimitive(1);
    assertFalse(json.getAsBoolean());

    json = new JsonPrimitive("1");
    assertFalse(json.getAsBoolean());

    json = new JsonPrimitive("true");
    assertTrue(json.getAsBoolean());

    json = new JsonPrimitive("TrUe");
    assertTrue(json.getAsBoolean());

    json = new JsonPrimitive("1.3");
    assertFalse(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 testByteEqualsShort() {
    JsonPrimitive p1 = new JsonPrimitive(new Byte((byte)10));
    JsonPrimitive p2 = new JsonPrimitive(new Short((short)10));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testByteEqualsInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Byte((byte)10));
    JsonPrimitive p2 = new JsonPrimitive(new Integer(10));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testByteEqualsLong() {
    JsonPrimitive p1 = new JsonPrimitive(new Byte((byte)10));
    JsonPrimitive p2 = new JsonPrimitive(new Long(10L));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testByteEqualsBigInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Byte((byte)10));
    JsonPrimitive p2 = new JsonPrimitive(new BigInteger("10"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testShortEqualsInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Short((short)10));
    JsonPrimitive p2 = new JsonPrimitive(new Integer(10));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testShortEqualsLong() {
    JsonPrimitive p1 = new JsonPrimitive(new Short((short)10));
    JsonPrimitive p2 = new JsonPrimitive(new Long(10));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testShortEqualsBigInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Short((short)10));
    JsonPrimitive p2 = new JsonPrimitive(new BigInteger("10"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testIntegerEqualsLong() {
    JsonPrimitive p1 = new JsonPrimitive(new Integer(10));
    JsonPrimitive p2 = new JsonPrimitive(new Long(10L));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testIntegerEqualsBigInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Integer(10));
    JsonPrimitive p2 = new JsonPrimitive(new BigInteger("10"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testLongEqualsBigInteger() {
    JsonPrimitive p1 = new JsonPrimitive(new Long(10L));
    JsonPrimitive p2 = new JsonPrimitive(new BigInteger("10"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testFloatEqualsDouble() {
    JsonPrimitive p1 = new JsonPrimitive(new Float(10.25F));
    JsonPrimitive p2 = new JsonPrimitive(new Double(10.25D));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testFloatEqualsBigDecimal() {
    JsonPrimitive p1 = new JsonPrimitive(new Float(10.25F));
    JsonPrimitive p2 = new JsonPrimitive(new BigDecimal("10.25"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  public void testDoubleEqualsBigDecimal() {
    JsonPrimitive p1 = new JsonPrimitive(new Double(10.25D));
    JsonPrimitive p2 = new JsonPrimitive(new BigDecimal("10.25"));
    assertEquals(p1, p2);
    assertEquals(p1.hashCode(), p2.hashCode());
  }

  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());
  }

  public void testEquals() {
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive("A"), new JsonPrimitive("A"));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(true), new JsonPrimitive(true));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(5L), new JsonPrimitive(5L));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive('a'), new JsonPrimitive('a'));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Float.NaN), new JsonPrimitive(Float.NaN));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Float.NEGATIVE_INFINITY),
        new JsonPrimitive(Float.NEGATIVE_INFINITY));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Float.POSITIVE_INFINITY),
        new JsonPrimitive(Float.POSITIVE_INFINITY));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Double.NaN), new JsonPrimitive(Double.NaN));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Double.NEGATIVE_INFINITY),
        new JsonPrimitive(Double.NEGATIVE_INFINITY));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Double.POSITIVE_INFINITY),
        new JsonPrimitive(Double.POSITIVE_INFINITY));
    assertFalse(new JsonPrimitive("a").equals(new JsonPrimitive("b")));
    assertFalse(new JsonPrimitive(true).equals(new JsonPrimitive(false)));
    assertFalse(new JsonPrimitive(0).equals(new JsonPrimitive(1)));
  }

  public void testEqualsAcrossTypes() {
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive("a"), new JsonPrimitive('a'));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(new BigInteger("0")), new JsonPrimitive(0));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(0), new JsonPrimitive(0L));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(new BigInteger("0")), new JsonPrimitive(0));
    MoreAsserts.assertEqualsAndHashCode(new JsonPrimitive(Float.NaN), new JsonPrimitive(Double.NaN));
  }

  public void testEqualsIntegerAndBigInteger() {
    JsonPrimitive a = new JsonPrimitive(5L);
    JsonPrimitive b = new JsonPrimitive(new BigInteger("18446744073709551621")); // 2^64 + 5
    // Ideally, the following assertion should have failed but the price is too much to pay 
    // assertFalse(a + " equals " + b, a.equals(b));
    assertTrue(a + " equals " + b, a.equals(b));
  }

  public void testEqualsDoesNotEquateStringAndNonStringTypes() {
    assertFalse(new JsonPrimitive("true").equals(new JsonPrimitive(true)));
    assertFalse(new JsonPrimitive("0").equals(new JsonPrimitive(0)));
    assertFalse(new JsonPrimitive("NaN").equals(new JsonPrimitive(Float.NaN)));
  }

  public void testDeepCopy() {
    JsonPrimitive a = new JsonPrimitive("a");
    assertSame(a, a.deepCopy()); // Primitives are immutable!
  }
}

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