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API Load Testing (Locust/Python)

The tool supports and provide a rich envirnoment for http/https protocol based load testing. Current project is build using locust version 0.9.0 and python 3.6. It is also writtten to configure with CI tools such as Jenkins with Dashboard and Email reports functionality.

Installation

  1. Download and Install python version 3.6 based on your device from https://www.python.org/downloads/
  2. Install locust version 0.9.0 via https://docs.locust.io/en/latest/installation.html

Dependencies Libraries:

  1. Plotly
  2. Panda
  3. Yattag
  4. Ymal

Writing Tests

There are very basic steps which are needed to be followed :

  1. Add an API for which you need to make a request to data/requests.yaml
API_1 :
    TYPE : POST
    ENDPOINT : 
    HEADERS :
      Content-Type : application/json
    BODY :
      ent_id: 
      password: 
      remember_me: 
      service: 
      user_name:

Here :

  • API_1 is your API description.
  • TYPE is your HTTP/HTTPS request type.
  • ENDPOINT is your api end point.
  • HEADERS are the header which you want to send with your request.
  • BODY is your body container.(Currently it resembles a json body but can be modified as well)
  1. Create a test class inside locust/tests/ where we can add a test something like:
class DemoTest(TaskSet):

   @task
   def test_demo(self):
       request = model.RequestModel('API_1')
       response = http_request.make_post_request(self.client, request)
       if response.status_code == 200 :
           response.success()
       else :
           response.failure('Wrong Response Code')

Here :

  • Firstly a request object is created for API_1 via model class present at locust/packages/models.py.
  • request object is passed to make_post_request method at locust/packages/requests_handler.py which is generic function for making POST requests.
  • The returned response object is then used to validate via assertions.
  1. Add your class to locustfile.py.

Running Your Tests

There are basically two ways to launch/run the project :

1. Locust Web Interface

You could directly run the current test set by launching a command prompt / shell based on your choice of operating system and type in locust --host=<Your Host Name> in there inside your project directory. This will launch the localserver at 8089 port from where you could provide the number of user and hatch rate.

2. Locust No Web Interface

You could directly run the current test set by launching a command prompt / shell based on your choice of operating system and type in locust --host=<Your Host Name> --csv=responses --no-web -c 1000 -r 100 -t 1m in there inside your project directory. You could look up here https://docs.locust.io/en/stable/running-locust-without-web-ui.html for more details.

Setting Up Your CI For Run (Using Jenkins)

Steps

  1. Create a freestyle project.
  2. Under Source Code Management provide repository path.
  3. Under Build choose Execute Shell option and type in following in the command area :
locust --host=<Your Host Name> --csv=responses --no-web -c 1000 -r 100 -t 1m
python generate_reports.py $JENKINS_HOME\\jobs\\$JOB_NAME\\builds\\$BUILD_NUMBER\\log
  1. Configur Email notifications with email template path as reports\\email_summary.html.
  2. Configure HTML Publisher Plugin with path reports\\dashboard_summary.html.

  • The following kind of dashboard will be generated : alt text

  • The following kind of emails will be sent : alt text