RestSharp API Testing

RestSharp is a popular and versatile library for API testing in .NET. It provides a simple and intuitive API that allows developers to send HTTP requests, handle responses, and validate API interactions. RestSharp is widely used for API testing and automation in various .NET projects.

Key Features of RestSharp API Testing

• HTTP Request Configuration: RestSharp allows you to configure various aspects of an HTTP request, including headers, parameters, authentication, and more.
• Request Execution: It provides methods to send GET, POST, PUT, DELETE, and other HTTP requests to interact with APIs.
• Response Handling: RestSharp offers convenient methods to access and analyze the response data, including headers, status code, and response body.
• Serialization and Deserialization: It supports automatic serialization and deserialization of request and response payloads, simplifying data handling.
• Authentication: RestSharp supports various authentication mechanisms, including basic authentication, OAuth, and custom authentication headers.
• Error Handling: It provides mechanisms to handle and process API errors, allowing you to assert and handle different response scenarios.
• Request Interception and Mocking: RestSharp allows you to intercept requests or mock responses for testing purposes, facilitating isolated and controlled testing.
• Integration with Testing Frameworks: RestSharp integrates smoothly with popular .NET testing frameworks like NUnit and xUnit, enabling seamless test execution and reporting.

Example Usage

Here's an example of using RestSharp for API testing:

using NUnit.Framework;
using RestSharp;

[TestFixture]
public class APITests
{
    private RestClient client;

    [SetUp]
    public void Setup()
    {
        client = new RestClient("https://api.example.com");
    }

    [Test]
    public void TestGetUser()
    {
        RestRequest request = new RestRequest("/users/1", Method.GET);

        IRestResponse response = client.Execute(request);

        Assert.AreEqual(200, (int)response.StatusCode);
        Assert.AreEqual("John Doe", response.Content);
    }

    [Test]
    public void TestCreateUser()
    {
        RestRequest request = new RestRequest("/users", Method.POST);
        request.AddJsonBody(new { name = "Jane Smith", email = "jane@example.com" });

        IRestResponse response = client.Execute(request);

        Assert.AreEqual(201, (int)response.StatusCode);
        Assert.AreEqual("Jane Smith", response.Content);
    }
}

In the example above, two test methods (TestGetUser and TestCreateUser) are defined using RestSharp and NUnit. Each method sends an HTTP request using RestSharp and performs assertions on the response.

RestSharp provides a straightforward and convenient approach to API testing in .NET, allowing developers to write concise, readable, and effective tests for API interactions.