TestDriver allows you to execute custom Node.js scripts and shell scripts within your test workflows using the exec command. This feature, introduced in version 5.1.0, enables you to integrate custom logic, such as generating one-time passwords (OTPs), hitting APIs, or performing other dynamic operations, directly into your tests.

​
Key features

  1. Run Node.js Scripts:
  • Execute custom JavaScript code within your test steps.
  • Use NPM modules to extend functionality.
  1. Dynamic Outputs:
  • Store the result of your script in a variable for use in subsequent steps.
  1. NPM Support:
  • Install and use NPM packages in your scripts.

​
Updated example: One-time password (OTP) validator

This example demonstrates how to generate a one-time password (OTP) using the totp-generator NPM package and use it in a test.

​
Test file: testdriver/testdriver.yaml

version: 5.3.8
steps:
  - commands:
      - command: exec
        lang: pwsh
        linux: |
          npm install totp-generator
      - command: exec
        lang: js
        output: totp
        linux: |
          const { TOTP } = require("totp-generator");
          let otp = TOTP.generate("JBSWY3DPEB3W64TMMQQQ").otp;
          console.log(otp);
          result = otp;
      - command: type
        text: ${OUTPUT.totp}

​
Additional details

  • The exec command now takes a lang argument and supports different operating systems (linux, mac, and windows).
  • Supported lang values are js or shell:
    • js code is executed in a Node.js VM on the host machine (your computer).
    • shell code is executed in the shell on the runner.
  • Code specified in linux, mac, and windows is executed based on the platform of the runner machine.

​
Protips

  • Always assign the output of your script to the result variable.
  • Ensure all required NPM packages are installed locally and in the prerun script when using GitHub Actions.
  • The script runs in the same context as the calling process and uses Node.js’s VM module internally.