Back to Repositories

Testing LazilyParsedNumber Implementation in google/gson

This test suite validates the LazilyParsedNumber class functionality in Google’s Gson library, focusing on number parsing, equality comparison, and serialization capabilities. The tests ensure reliable handling of numeric values with delayed parsing implementation.

Test Coverage Overview

The test suite provides comprehensive coverage of LazilyParsedNumber’s core functionality:

Hash code generation and equality comparison
Java serialization and deserialization
Numeric value consistency checks
Integration with BigDecimal conversion

Implementation Analysis

The testing approach utilizes JUnit framework with Truth assertions for precise verification. The implementation demonstrates a systematic verification of lazy parsing behavior, ensuring numeric values maintain consistency across different operations and transformations.

Key patterns include isolated test methods, clear assertion statements, and proper setup of serialization streams.

Technical Details

Testing tools and configuration:

JUnit test framework
Google Truth assertion library
Java I/O classes for serialization testing
BigDecimal for precise numeric comparison

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Atomic test methods with single responsibility
Clear test method naming conventions
Proper resource handling in serialization tests
Strong type safety and assertion clarity

google/gson

gson/src/test/java/com/google/gson/internal/LazilyParsedNumberTest.java

            
/*
 * Copyright (C) 2015 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.internal;

import static com.google.common.truth.Truth.assertThat;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigDecimal;
import org.junit.Test;

public class LazilyParsedNumberTest {
  @Test
  public void testHashCode() {
    LazilyParsedNumber n1 = new LazilyParsedNumber("1");
    LazilyParsedNumber n1Another = new LazilyParsedNumber("1");
    assertThat(n1Another.hashCode()).isEqualTo(n1.hashCode());
  }

  @Test
  public void testEquals() {
    LazilyParsedNumber n1 = new LazilyParsedNumber("1");
    LazilyParsedNumber n1Another = new LazilyParsedNumber("1");
    assertThat(n1.equals(n1Another)).isTrue();
  }

  @Test
  public void testJavaSerialization() throws IOException, ClassNotFoundException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ObjectOutputStream objOut = new ObjectOutputStream(out);
    objOut.writeObject(new LazilyParsedNumber("123"));
    objOut.close();

    ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(out.toByteArray()));
    Number deserialized = (Number) objIn.readObject();
    assertThat(deserialized).isEqualTo(new BigDecimal("123"));
  }
}