AMA: bdd frameworks, api test tools & unit testing responsibility

Swapnil Waghmare asks…

Are BDD frameworks like Specflow, Cucumber better for E2E tests?

My response…

There’s two ways I can interpret this question (my additions are in bold).


Are BDD frameworks that use ‘Given/When/Then’ feature files like Specflow, Cucumber  better than frameworks that use ‘describe/it’ blocks like RSpec and Mocha for e2e tests?

As I previously explained, Automattic’s unit tests are written in Mocha, so that was a logical choice for writing e2e tests as there is a lot of familiarity of it within Automattic, which will hopefully mean more developers are interested in the e2e tests we are writing using Mocha/WebDriverJs.

There are some challenges with writing end-to-end tests with Mocha (mainly that Mocha tests are all independent so will continue to run if a previous step in the scenarios fails) so I haven’t completely ruled out investigating a move to Cucumber at some point for the e2e tests.


Are BDD frameworks like Specflow, Cucumber better for E2E tests than using them for automated integration, component or unit tests?

I think you could write integration tests or even unit tests in Given/When/Then format as most unit tests follow the same arrange/act/assert pattern anyhow which is exactly what Given/When/Then is.

Keep in mind there is overhead in maintaining all the step definitions and feature files for Cucumber/Specflow that give you non technical readability so if you don’t require that readability it is probably overkill. But a personal preference nonetheless.

Swapnil Waghmare also asks…

Which tools have you used for API testing, which ones would you recommend?

My response…

At the moment my main focus is on automated unit test and automated e2e test coverage in JavaScript.

I try to keep things simple, so in the past when I’ve written REST integration tests I’ve just called them using in built libraries, and have used Postman quite a lot for manual testing and debugging.

Swapnil Waghmare finally asks…

What is the reason behind writing E2E tests using JavaScript? Isn’t any Object oriented language a better choice for writing E2E tests? Should QA’s write Unit tests?

My response…


Firstly, JavaScript is actually object oriented, it’s just not class-based object oriented like Java, C# or Ruby. The newer versions of JavaScript, called ECMAScript, or ESScript are more class-based object oriented.

I’ve actually already answered why I chose JavaScript in a previous answer, so I’ll summarise that here and you can read the rest in that answer. built an entirely new UI for managing sites using 100% JavaScript with React for the main UI components. I am responsible for e2e automated tests across this UI, and whilst I originally contemplated, and trialled even, using Ruby, this didn’t make long term sense for where the original WordPress developers are mostly PHP and the newer UI developers are all JavaScript.

As for whether QA’s should write unit tests? No, I don’t think so, as I believe unit tests should drive software development, and writing code by writing unit tests is much easier than trying to add unit tests after by someone else, as the original code will not likely be very testable as it wasn’t written with testability in mind. One benefit of code written with unit tests at the time is that it will mostly be better code as the tests are consuming your API that you are developing.

Author: Alister Scott

Alister is an Excellence Wrangler for Automattic.

4 thoughts on “AMA: bdd frameworks, api test tools & unit testing responsibility”

  1. My organization is also switching to the React framework and testers were asked to use Mocha to be compatible with the developer skill sets. I write e2e tests and initially created them as a set of “it” blocks for each test.
    I didn’t like how Mocha would continue to run steps B and C, even though step A failed. In the end, I chose to put all the e2e logic in one step with several asserts contained within. It doesn’t feel right, but at least each e2e test either passes or fails. It seems Mocha is better suited for unit tests, so I don’t think my solution is optimal.

    Liked by 1 person

  2. Thanks Alister for the answers!!
    Your blog posts have been very informative to me, I like the way you use quotes in your blog posts.
    I am little confused by your answer (“No”) to my last question. I have been involved in writing e2e and acceptance tests until now. This question came to my mind when I read in your few blog posts that your focus has been on “automated unit test” and automated e2e test coverage.

    Liked by 1 person

Comments are closed.