Template Expressions

Many of command/assertion parameters accept templates. So you can use template variables and expressions. For example, page.goto("https://github.com/{{ USER }}/puppetry/") or TARGET.type("name{{ counter() }}")

Template variables

By using Settings/Template Variables panel we can define a set of variables per environment. For an instance, we can declare a separate target app URL for every environment (test.acme.com, stage.acme.com, www.acme.com). Before running/exporting test project we specify the desired environment and the corresponding template tags will be replaced with the value (URL) given for that environment.

Managing Variables

To edit template variables click on Settings... in the main menu:

Settings in the main menu

Under the table Template variables you will find a manageable table with variables (by default it's empty):

Editing template variables

You can use this UI the same way to do with targets, suits, and test cases. The difference is that the displayed variables belong to the selected environment:

As you add a new variable let's say to test environment it appears in all available environments. But when you update it's value, the value stays unique per environment.

Also note the edit action link next to the environment selector. When you click it you get a modal window where you can manage the list of environments:

Editing environment list

After we assigned the variables and running the tests (or exporting them for CI) in the modal window we can choose what environment we target:

Choose target environment

Template Syntax



The tag makes Puppetry injecting the variable value assigned for the selected environment into the container string


{{ BASE_URL }}/api/{{ API_VERSION }}/method

Template variables can be also assigned dynamically. E.g. you can use page.assignVar to define a variable by using expressions or page.assignVarRemotely to define a variable by using REST API (learn more).

Template Expressions

Template expressions are basically functions that we may want to use for building template string.

Test step parameters supporting templates provided with a helper widget, which you can you to autofill the field:

Template helper widget

Environment Variables


{{ env( NAME ) }}

Function returns system environment variable by a given name


{{ env( "SECRET" ) }}



{{ counter() }}

Function increments every time it called, but is unique per command/assertion


joe.{{ counter() }}@acme.com

This template resolves in email addresses [email protected], [email protected] and so on



{{ iterate( LIST ) }}

Function iterates through a given list. It starts from the beginning as it reaches the end


This template resolves in [email protected], [email protected], [email protected], [email protected], ...



{{ random( LIST ) }}

Function picks a random value out of a given list.




{{ fake( FAKER_METHOD, LOCALE ) }}

Function generates dummy data, by using Faker.js methods‚Äč


{{ faker("address.streetSuffix", "en_GB") }}