---
title: "Behavior-Driven Development in R Shiny: Modeling User Behavior with When Steps"
url: https://daily.dev/posts/behavior-driven-development-in-r-shiny-modeling-user-behavior-with-when-steps-gfig5e8fk
source_url: https://www.r-bloggers.com/2026/05/behavior-driven-development-in-r-shiny-modeling-user-behavior-with-when-steps
type: article
source: "R-bloggers"
published: 2026-05-26T18:19:51.366Z
updated: 2026-05-26T18:20:18.454Z
tags: ["testing", "r"]
reading_time: 12
upvotes: 0
comments: 0
language: en
---

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# Behavior-Driven Development in R Shiny: Modeling User Behavior with When Steps

**[R-bloggers](https://daily.dev/sources/rbloggers)** · 12 min read · 0 upvotes · 0 comments

## Summary

A practical guide to writing When steps in Behavior-Driven Development (BDD) for R Shiny applications. Covers how to model user behavior without leaking UI implementation details, using a driver pattern (R6 class extending shinytest2::AppDriver) as a translation layer between domain-level step names and actual UI mechanics. Explains naming conventions (domain language over UI language), the context pipeline pattern, parameterized steps, multi-step flows, and signs that a When step is too complex. Includes code examples showing how to keep specifications stable across UI refactors.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.r-bloggers.com/2026/05/behavior-driven-development-in-r-shiny-modeling-user-behavior-with-when-steps>

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Tags: [#testing](https://daily.dev/tags/testing), [#r](https://daily.dev/tags/r)

[View this post on daily.dev](https://daily.dev/posts/behavior-driven-development-in-r-shiny-modeling-user-behavior-with-when-steps-gfig5e8fk)