How to Write End-to-End Tests for MongoDB Realm Serverless Apps

How to Write End-to-End Tests for MongoDB Realm Serverless Apps

Learn how to write end-to-end tests for MongoDB Realm Serverless Apps.

Learn how to write end-to-end tests for MongoDB Realm Serverless Apps.

End-to-end tests are the cherry on top of a delicious ice cream sundae of automated tests. Just like many people find cherries to be disgusting (rightly so—cherries are gross!), many developers are not thrilled to write end-to-end tests. These tests can be time consuming to write and difficult to maintain. However, these tests can provide development teams with confidence that the entire application is functioning as expected.

Today I'll discuss how to write end-to-end tests for apps built using MongoDB Realm.

This is the third post in the DevOps + MongoDB Realm Serverless Functions = 😍 blog series. I began the series by introducing the Social Stats app, a serverless app I built using MongoDB Realm. I've explained how I wrote unit tests and integration tests for the app. If you haven't read the first post where I explained what the app does and how I architected it, I recommend you start there and then return to this post.

Writing End-to-End Tests for MongoDB Realm Serverless Apps

Today I'll focus on the top layer of the testing pyramid: end-to-end tests. End-to-end tests work through a complete scenario a user would take while using the app. These tests typically interact with the user interface (UI), clicking buttons and inputting text just as a user would. End-to-end tests ultimately check that the various components and systems that make up the app are configured and working together correctly.

Because end-to-end tests interact with the UI, they tend to be very brittle; they break easily as the UI changes. These tests can also be challenging to write. As a result, developers typically write very few of these tests.

Despite their brittle nature, having end-to-end tests is still important. These tests give development teams confidence that the app is functioning as expected.

mongodb testing serverless

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