Instrumenting Our Frontend Test Suite (...and fixing what we found)

This page summarizes the projects mentioned and recommended in the original post on dev.to

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  • jest

    Delightful JavaScript Testing.

    As mentioned above, we use Jest as our test runner. It’s important to note, that our instrumentation method requires using jest-circus test runner. This is the default for Jest version 27, however, it can be used with earlier versions of Jest. jest-circus is required because it allows us to listen to events from Jest by using a custom environment and defining a handleTestEvent method. Below is a basic test snippet annotated with an approximation of where jest-circus’s events are fired.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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  • Sentry

    Developer-first error tracking and performance monitoring

    Sentry’s Performance Monitoring instrumentation is tree-like in structure with a transaction as the root node, and spans as child nodes. We can use a combination of the event name and the test name to determine if we should either create a transaction, create a child span from an existing transaction or end a span/transaction. Here’s an example of how we implemented it.

  • jest-sentry-environment

    Discontinued Sentry performance instrumentation for jest

    We provided an example Jest environment that you can use if you’re interested in instrumenting your own Jest tests. You’ll need to install the jest-sentry-environment package and update your Jest configuration to use the fore-mentioned package, as well as supplying your Sentry DSN. For further instructions, please see the repository.

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