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Testing JSON Parser Parameterized Operations in google/gson

This test suite validates JSON parsing and serialization in the GSON library through parameterized testing. It ensures that JSON strings are correctly parsed into JsonElement objects and can be serialized back to their original form without data loss.

Test Coverage Overview

The test suite provides comprehensive coverage of JSON parsing scenarios using parameterized tests.

Key test cases include:

Empty arrays and objects
Null values
Numeric values
Boolean values
String values
Complex nested JSON structures

Edge cases are addressed through various JSON structure combinations and nested hierarchies.

Implementation Analysis

The implementation utilizes JUnit’s Parameterized test runner for efficient test case execution. The testing approach leverages data-driven testing patterns by defining multiple JSON input strings and verifying both parsing and serialization operations.

Framework features include:

@RunWith(Parameterized.class) for parameterized testing
TypeAdapter for JSON serialization
Truth assertion library for validation

Technical Details

Testing tools and configuration:

JUnit 4 testing framework
Google Truth assertion library
GSON TypeAdapter for JSON handling
Parameterized test runner configuration
Static test data generation through Arrays.asList()

Best Practices Demonstrated

The test suite exemplifies several testing best practices including data-driven test design, systematic validation of parsing and serialization, and comprehensive edge case coverage.

Notable practices:

Parameterized test structure for multiple test cases
Bidirectional validation (parse and serialize)
Clean and maintainable test organization
Effective use of assertion libraries

google/gson

gson/src/test/java/com/google/gson/JsonParserParameterizedTest.java

            
/*
 * Copyright (C) 2022 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 static com.google.common.truth.Truth.assertThat;

import java.util.Arrays;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class JsonParserParameterizedTest {
  @Parameters
  public static Iterable<String> data() {
    return Arrays.asList(
        "[]",
        "{}",
        "null",
        "1.0",
        "true",
        "\"string\"",
        "[true,1.0,null,{},2.0,{\"a\":[false]},[3.0,\"test\"],4.0]",
        "{\"\":1.0,\"a\":true,\"b\":null,\"c\":[],\"d\":{\"a1\":2.0,\"b2\":[true,{\"a3\":3.0}]},\"e\":[{\"f\":4.0},\"test\"]}");
  }

  private final TypeAdapter<JsonElement> adapter = new Gson().getAdapter(JsonElement.class);
  @Parameter public String json;

  @Test
  public void testParse() {
    JsonElement deserialized = JsonParser.parseString(json);
    String actualSerialized = adapter.toJson(deserialized);

    // Serialized JsonElement should be the same as original JSON
    assertThat(actualSerialized).isEqualTo(json);
  }
}