Running a Subset of Scenarios

The Cucumber Book, Second Edition — by Matt Wynne, Aslak Hellesøy, with Steve Tooke (87 / 136)

👈 Cucumber’s Command-Line Options | TOC | Changing Cucumber’s Output 👉

As the number of features and scenarios grows, we’ll frequently run into situations where we want to run only a single (or maybe a couple) of scenarios to get faster feedback. This can be if we are working on a new scenario or if we have broken an existing one. Let’s take a closer look at how this works.

The simplest way to use the — tags option is to give it a single tag to run, for example:

This would cause Cucumber to run just the scenarios tagged with @focus. It’s quite common to temporarily tag a scenario or feature with a unique tag like this to filter what to run.

In some situations, we may want a little more control over the tag filtering. Imagine that we have made some changes to a piece of our application that sends out emails. What if we want to run all scenarios tagged with @focus or @email? Here is how:

If the feature file has more than one scenario, it will run only the one on line 45. The line number can be anywhere in the feature, ranging from a comment line to the last step (including a step table or doc string).

You have probably noticed that Cucumber prints out the location of a feature file with the line number in error messages.

If you want to rerun the scenario that failed, just select the text and paste it:

This is equivalent to using the — line option. The colon notation also allows you to specify several line numbers, allowing you to specify several scenarios to run:

If you prefer, you can also do this using the — lines argument. Cucumber doesn’t mind whether you say — line or — lines.

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