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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.
I use two things for this kind of testing. I have historically used Behat a lot. Behat is behavioral testing that runs against your site through browser automation, whether headless or headful. You also have the ability to integrate with your Drupal site and its APIs and code either as a native runner or interfacing through drush, depending on how and where you are running your tests. https://github.com/jhedstrom/drupalextension
I also use Drupal Test Traits, which lets you write PHP-based tests (instead of Gherkin tests like Behat) that you can run with phpunit. These are very useful and very powerful because they run in your working, bootstrapped Drupal site. They won’t run as quickly as unit tests or kernel tests. It’s basically writing functional tests but against your existing site. The test suites are, in fact, called ExistingSite and ExistingSiteJavascript. https://gitlab.com/weitzman/drupal-test-traits