Developer Points: Web Performance and Load Testing of Rest API(ASP.NET Web API) by using Visual Studio Tool

This blog explain how to create Web Performance and Load testing Project in visual studio and it explains steps by steps how to perform load and web performance testing of ASP.NET WEB API or Rest API. We will discuss about the different pattern of load testing like constant and step load pattern

In the Enterprise edition of Visual Studio, Web performance and load test projects are available and you can install the load testing component

Steps to create Web Request:

1. Create Web Performance and Load Test Project

· Open the visual studio and choose Create a new project

· select the Web Performance and Load Test Project

Web Performance and Load Test Project:

2. Create Web API request : Select WebTest1.Webtest and click on Add Request options

Provides the API URL

URL: http://localhost/SampleAPI/OrderNumber/123456

· Add Header, if required

· Add Query String, if required

In current request, Token Header is added

Steps to create load test:

1. Right click on project node and choose the Add à Load test

2. “New Load Test Wizard” Options

There are two options

1. Cloud-based Load test

2. On –premises Load Test

If you want to run in local network and on local system, choose the On-premises load test and click on Next, ‘Run Setting’ screen will be appeared

3. Run Settings

In Load run setting, you can provide the total load test duration time along with warm-up duration time

Load test duration

Run duration: 10 mins

Warm –up duration: 30 secs

Click on Next, scenario screen will be appeared

4. Load Test scenario

You can give load test scenario name – ConstantLoad and click on Next button, Load Pattern screen will be appeared.

5. Load Pattern

There are two type of load patterns

· Constant Load

· Steps Load

In constant loan, the same loaded will be applied for all testing duration and load will not be changed.

In steps pattern, the load will be gradually increased after given step duration

We choose constant load and entered 10 user count for load testing and click on Next button, the test Mix Model screen will be appeared.

6. Test Mix Model:

There are following models for test mix

· Based on the total number of tests

· Based on the number of virtual users

· Based on user pace

· Based on sequential test order

For this load testing, I choose the based on the number of virtual users option and click on Next button, The Tax Mix Screen will be appeared.

7. Test Mix

You can add tests to a load test scenario

Click on Add button à Add Tests popup window will be opened and you can select test from Available tests list and click on OK button.

You can distribute load (in %) among all selected tests and if you want to manually adjust the distribution, simply enter value under % column or use scroll-bar

under distribution column .

If you want to load should be equally distributes among all tests, click on Distribute button

Click on Next button, the Network Mix will be appeared.

8. Network Mix

In Network Mix, you can add one or more network types for load testing and also you can distribute among them (simply enter value or use scroll-bar)

Click on Next button, the browser mix screen will be appeared.

9. browser mix

In browser mix, you can add one or more browser for load testing and also you can distribute load among them (in above pic) I have selected two browser

Chrome and Firefox for load testing and load are equally distributed.

Click on Next button, the Counter Set wizard will be opened.