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String Interpolation in UI Steps Views

String Interpolation in UI Steps

Interpolated Strings (also called Template Strings) contain Evaluation Groups, or eval groups, whose content is interpreted. A Template String always results in a String. The main purpose for Template Strings is simpler formatting of output, although it can also be used to perform String arithmetics. Because Template Strings are common UI Steps Strings, they can be enclosed in double quotes ("") or single quotes ('').

String Interpolation Usage


  • Every String that is used within UI Steps can be a Template String.

  • An eval group starts with ${ and ends with a curly bracket, }. @{} should not be used.

  • Everything placed within an eval group is passed on to the interpreter for evaluation.

An eval group may contain everything that is eligible for a right-hand side of an assignment. Therefore, variables and functions can be used. Additionally:

  • Multiple eval groups can be used in a Template String.

  • Nesting eval groups should be avoided, as it can cause a parsing failure.

  • Whenever a Template String does not contain any eval groups, it evaluates to a standard UI Steps String.


The interpolateWebtestDefinitions field of the Language configuration interpolates Strings when set to true. If set to false, Strings will not be treated as Template Strings even if they contain eval groups. The default for interpolateWebtestDefinitions is false to avoid any backward incompatibilities.

More details about the Language configuration is available in String Escaping and Interpolation in Custom Languages.

Configuration Example

Language {
    interpolateStrings = true
    interpretStringEscapes = true
    interpolateWebtestDefinitions = true

UI Steps View Example

view SearchView(elementTitle)
    url ""
    elem searchBox := "//input[@title='${elementTitle + 'SomeSuffix'}' and @class=\"b_searchbox\"]"

    action (searchBox) enter := type
    action (searchBox) search := click

The examples above contains the eval group ${elementTitle + 'SomeSuffix'}. It returns:

  • The title of the webpage result that is clicked upon

  • The suffix of the webpage