API Testing tools in C#

Question

I'm looking at writing at automated tests to cover regression testing in respect of Restful API's.

I have familiarity with how to do this in Java using Rest Assured, however the company I currently work for is a .NET house so it would make sense to write the automated tests in Visual Studio using c# as the programming language.

My question is whether anyone has any advice on testing tools that can be utilized, or point me in the direction of how I might go about building a framework in C#. Essentially, coming at this from the ground up.

Answer 1

You can use the combination of any unit testing framework (like NUnit, MSTest, XUnit) with additional nuget packages for the work with REST API itself

• RestSharp (http://restsharp.org/) Probably the most popular and convenient REST HTTP Client for .Net.
• RestAssured.Net (https://github.com/lamchakchan/RestAssured.Net) .Net port of Java's lib, may be easier for you if you are already familiar with this approach.

Also I recommend using the Json.NET (https://www.newtonsoft.com/) nuget for convenient work with the request/response JSON data, it's much easier to work with the deserialized objects that with the plain JSON strings.

Answer 2

Writing an API test in Visual Studio can be done with:

• NUnit or MSTest as your Test Runner ** NUnit and the TestAdapter are available on Nuget
• An http client, like .Net's HttpClient ** This is in the System.Net namespace
• (Optional) Json.Net for parsing responses ** Also avaiable on Nuget

Your test will look something like this:

[Test]
public void Record01StatusCode()
{
    // Arrange: Define the endpoint to be tested
    string requestUri = "http://foo.bar/record/01";
    // Act: Make the request (Note: MakeRequest is a method I wrote in another class)
    HttpResponseMessage response = httpClient.MakeRequest(HttpMethod.Get, requestUri);
    // Assert: The request returns a successful response
    Assert.IsTrue(response.IsSuccessStatusCode, "Response was not a success status code!");
}

Answer 3

You can try

• this http://unirest.io/net
• or this http://restsharp.org/
• or this https://github.com/lamchakchan/RestAssured.Net

Answer 4

You can use Jmeter or Postman to test the APIs. It will be easy to form the payload . If further to automate can invoke Jmeter through Jenkins, command line or batch file.