API Testing and Architectures for QA/SDET Role in MAANG & Product Companies

 

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🍀API Testing and Architectures🍀

APIs (Application Programming Interfaces) serve as the backbone of modern software applications, enabling seamless communication between different software components. API Testing plays a crucial role in ensuring the functionality, reliability, and security of these interfaces.

API Testing involves evaluating various aspects of an API, including its functionality, performance, security, and reliability. Testing APIs is essential as they act as bridges that allow different software systems to exchange data and functionality. A well-tested API ensures that applications can interact effectively, preventing potential issues such as data inconsistencies, security vulnerabilities, or service disruptions.

In this post we will discuss about two ways software is built — Microservices and Monoliths — and why it matters for testing APIs.

⛔️Microservices Architecture

Picture a Lego set! Microservices are like individual Lego pieces — small, independent parts. They work together by talking through APIs. This helps make big, complex projects more flexible and easy to handle.

Microservices architecture is an approach to software development where a complex application is divided into a set of small, independent services that communicate with each other through well-defined APIs. Each microservice is designed to perform a specific business function and can be developed, deployed, and scaled independently. This decentralized structure allows for increased agility, as different teams can work on separate microservices concurrently, and failures in one service don’t necessarily affect the entire system. Microservices promote scalability, flexibility, and easier maintenance but require a robust communication mechanism between services.

In API Testing:

👉Testing Blocks:

We can test each Lego block separately. It’s like checking each part of your project one by one.

👉Fast Testing:

Because they talk to each other, we can test them at the same time, making testing quicker.

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⛔️Monolith Architecture:

Now, imagine your Lego set as one big piece. 

🏰 Monoliths are like that — everything in one place. It’s simple but needs extra care.

Monolith architecture, in contrast to microservices, represents a traditional approach where an entire application is built as a single, tightly integrated unit. In a monolith, all components, functionalities, and modules are interconnected and share the same codebase and database. While monoliths are simpler to develop and deploy initially, they can become challenging to scale and maintain as the application grows. Changes or updates to one part of the system often require redeploying the entire application. Monoliths are known for their simplicity, but they may face limitations in terms of scalability and agility compared to more modular microservices architectures.

In API Testing:

👉Checking All Parts:

We need to test everything together to make sure our big Lego creation works perfectly.

👉Understanding Connections:

Testing helps us know how all the pieces connect and work as a team.

👉Checking the Whole Castle:

We test to make sure our entire castle (or project) does what it’s supposed to do.

⛔️Which one to choose?

Generally speaking, the monolithic architecture might be ideal for smaller, less complex applications or for businesses with limited resources to manage and maintain their IT systems.

In contrast, a microservices architecture may be more appropriate for larger and more intricate applications that demand greater scalability and flexibility.

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SeleniumWebdriver Automation Testing Interview Questions:

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DevOps Interview Q&A:

https://automationreinvented.blogspot.com/2021/11/top-11-devops-interview-questions-and.html 

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API Chaining with Rest Assured

 

Top API Interview Question 1-10

Top API Interview Questions 11-20

Top API AUTOMATION Interview Q&A - 21-30

Top API Interview Q&A SET - 06

🎾 What is API Chaining?

API chaining is a technique used in API testing to make multiple API requests in a sequence, where each request's response becomes the basis for the next request. This can be achieved using libraries like Rest Assured in Java. API chaining is often used to test scenarios that involve multiple API endpoints or dependent operations. Below is an example of API chaining using Rest Assured:

🎾 API Chaining Scenario:

Let's assume we have a simple scenario where we want to:
- Create a user.
- Retrieve the created user's details.
- Update the user's information.
- Verify the updated user's details.

🎾 API Chaining using Rest Assured

Here's how you can achieve this using Rest Assured:

public class ApiChainingExample {

private static String baseURL = "https://example.com/api"; // Replace with your API base URL

@Test
public void testApiChaining() {

How to Automate GET-POST-PUT-DELETE with Rest Assured 

🔆🔺 // Step 1: First We create a user, extract the response JSON to get the user's ID.

String createUserResponse =
RestAssured.given()
.contentType(ContentType.JSON)
.body("{ \"name\": \"John\", \"email\": \"john@example.com\" }")
.when()
.post(baseURL + "/users")
.then()
.statusCode(201)
.extract()
.response()
.asString();


🔆🔺 // Step 2: Then We use the extracted user ID to retrieve the user's details.


String userId = RestAssured
.given()
.when()
.get(baseURL + "/users/{userId}", createUserResponse)
.then()
.statusCode(200)
.extract()
.path("id");


🔆🔺 // Step 3: Update the user's information

RestAssured.given()
.contentType(ContentType.JSON)
.body("{ \"name\": \"Updated John\", \"email\": \"updated_john@example.com\" }")
.when()
.put(baseURL + "/users/{userId}", userId)
.then()
.statusCode(200);



🔆🔺 // Step 4: Verify the updated user's details

RestAssured.given()
.when()
.get(baseURL + "/users/{userId}", userId)
.then()
.statusCode(200)
.assertThat()
.body("name", equalTo("Updated John"))
.body("email", equalTo("updated_john@example.com"));
}
}

This is a basic example of API chaining using Rest Assured. In real-world scenarios, API chaining can involve more complex operations and data handling.

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Share the scenarios in which you have used API chaining

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TOP API TESTING INTERVIEW Q&A

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Top 21 Java Coding Interview Q&A for SDET

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SeleniumWebdriver Automation Testing Interview Questions:

https://automationreinvented.blogspot.com/search/label/SeleniumWebdriver

API Testing Interview Question Set:

https://automationreinvented.blogspot.com/2022/03/top-80-api-testing-interview-questions.html

DevOps Interview Q&A:

https://automationreinvented.blogspot.com/2021/11/top-11-devops-interview-questions-and.html 

Kubernetes Interview Question Set

https://automationreinvented.blogspot.com/search/label/Kubernetes

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