How to use custom functions from JS file in Test Designer

Use

Custom JavaScript Helpers in Scenario Editor

Use customWe JavaScriptare helpers only when a reusable function is needed andcalling the behavior cannot be expressed clearly with standard Scenario Editor steps.

Recommended guidance

• Keep helper functions small, named clearly, and scoped to reusable logic.
• Do not embed credentials, tenant URLs, or environment-specific values in helper files.
• Version helper files with the scenario or project maintenance process.
• Prefer built-in Scenario Editor capabilities when they are sufficient.

Validation workflow

1. Define the helperJS function and expected inputs.
2. Validate it with a small controlled example.
3. Call it from the scenarioDS wherescript and it returns the reusablevalues behaviorafter evaluation

The JS function that we have created is needed.

Reviewshown outputbelow

This function will calculate a 10% discount on a Price that is entered. The usage of function in TD script is shown below

2. We can also make use of the Custom JS action in DS and failuresthen beforefetch the value using itthe inlocker

larger suites.