Bindings from External Assemblies#

Bindings can be defined in the main Reqnroll project or in other assemblies (external binding assemblies). If the bindings are used from external binding assemblies, the following notes have to be considered:

  • The external binding assembly can be another project in the solution or a compiled library (dll).

  • The external binding assembly can also use a different .NET language, e.g. you can write bindings for your C# Reqnroll project also in F# (As an extreme case, you can use your Reqnroll project with the feature files only and with all the bindings defined in external binding assemblies).

  • The external binding assembly has to be referenced from the Reqnroll project to ensure it is copied to the target folder and listed in the reqnroll.json of the Reqnroll project (see below).

  • The external binding assemblies can contain all kind of bindings: step definition, hooks and also step argument transformations.


In order to use bindings from an external binding assembly, you have to list it (with the assembly name) in the reqnroll.json (the Reqnroll project is always included implicitly). See Use bindings from external projects section of the documentation for details.

The following example registers the project SharedStepDefinitions as an external binding assembly.

  "$schema": "",

  "bindingAssemblies": [
      "assembly": "SharedStepDefinitions"