Testing Tool Presentation: TDD and AutoParam Insights

The presenter emphasizes the importance of TDD and introduces AutoParam as a solution for efficient testing.

### Reconnecting with Presentation Skills and TDD
The speaker reflects on their return to presenting after seven years, expressing challenges in **communicating ideas effectively**. They introduce a testing tool and share their experience with Test-Driven Development (TDD), emphasizing its **importance in their coding process**. The speaker also provides a sample API server code for a commerce platform, demonstrating the use of TDD through **unit tests for user signup and error handling**.

### Implementing Unique Email Handling and Query Processing in TDD
The process involves designating a pass, changing the password, and checking for duplicate emails using JPA. A **unique index on the email property** prevents duplicate entries, and an **exception is thrown when an insertion is attempted with the same email**. False positives in test results are resolved by using **random email data**, and the test code is used to express **system requirements and business rules**.

### Testing Product Returns by Seller in Spring Boot
The processor's requirement is to only return products associated with the **seller ID in the query**, avoiding returns for products owned by **other sellers**. To test this, Spring Boot tests will be used to inject necessary objects and create two sellers with random data, each owning a product. The test will validate if the returned objects have the **correct seller IDs**, and the presenter also discusses their experience with **TDD** and the creation of the **AutoPagi project** for convenient testing tools.

### The Development and Functionality of Auto Param
Auto Param project began on **March 6, 2021**, with the first deployment **within a week**. The current version is **8.3.0**, and it offers installation methods on its **GitHub project site**. The project uses annotations like **Auto Source** and parameterized test to generate **random data** and provide parameters for testing, while also customizing a factory to manipulate **seller IDs** for creating product entities.

### AutoParam Internal Architecture and Object Querying
The **AutoParam architecture** involves a Text class with **Retrieve** and **Customize** methods for object creation and modification. The object query interface offers **type** and **parameter queries** to specify the desired object. The object container, different from an optional type, accepts **null values** and provides methods for **unwrapping** and **mapping**, while the object generator uses the query and context to return an **object container**.

### Object Generators and Processors in Entity Creation
Object generators handle queries for specific types, returning values or empty results based on their capabilities. The **seller ID freezer** is a generator that only produces a value when the query parameter's name is **seller ID**. Processors are used to handle setters for property definitions, while customizers provide a way to **apply and extend the functionality** of generators and processors.

### Parameter Handling and Dependency Injection in Java
Parameter names in Java can be retrieved using reflection, but this was not always possible. The Spring Boot plugin simplifies parameter name retrieval and manages dependency resolution to **avoid conflicts**. The @Autowired annotation plays a **crucial role in instance creation**, while tools supporting Kotlin, Lombok, and Mockito offer **additional features for object management**.

### Discussion on TDD and Auto Parangsae
The conversation revolves around the challenges of **Test-Driven Development (TDD)** and the use of **unique constraints for isolation testing**. The speaker shares their experience of **not rolling back the database during TDD** due to **execution time concerns**. They also discuss the similarities and differences between **Auto Parangsae** and other tools like **Instashiona Fixture Monkey**, as well as the project's structure and its relation to the **ecosystem of a shop**.

### Reconnecting Through Testing: A Journey from TDD to AutoParam
* ⏳ "**Time really flies**" as I return to present seven years after my last talk, shifting from event sourcing and CQRS to introducing a **new testing tool**.
* 🤔 After a hiatus from conferences due to COVID and personal busyness, I felt **disconnected from effectively communicating my ideas**, prompting me to **simplify my presentation**.
* 📸 I encouraged attendees to take photos of my slides, assuring them that the **source code would be available for future reference**, fostering a relaxed atmosphere.
* 💻 I developed a sample API server for a commerce platform, demonstrating key functionalities like **login and product registration** while emphasizing my commitment to **Test-Driven Development (TDD)**.
* 🔄 I explained the importance of using **random test data** to avoid **false positives**, which can occur when tests share the same data, leading to **misleading results**.
* 📜 I highlighted that test code should **express business rules**, showcasing examples such as **validating email formats** and ensuring **unique seller IDs** in product queries.
* 🔧 To enhance TDD practices, I introduced **AutoParam**, a library I created to **simplify the generation of random test data**, making the testing process **more efficient**.
* 📚 In conclusion, I shared insights from my journey in creating AutoParam and addressed audience questions, emphasizing the **importance of evolving testing tools** to meet **modern development needs**.

스프링캠프 2024 [Track 2] 5.AutoParams를 사용한 Spring Boot 응용프로그램 테스트 (이규원)

애플리케이션 서버 개발자들과 함께 가치있는 기술에 관한 정보과 경험을 `공유`하고, 참가한 사람들과 함께 `인연`을 만들고, 시끌벅적하게 즐길 수 있는 개발자들을 위한 '축제'를 목표로 하는 컨퍼런스입니다.

컨퍼런스에서 다루었던 내용들을 공유하는 채널입니다.