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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 maintain stan-mode (https://github.com/stan-dev/stan-mode) for which I heavily used buttercup.
There are test runners for some languages, for example https://github.com/ionrock/pytest-el/ and others. I don't know one with a UI though. At least we can avoid the annoying typing in the terminal.
gotest package from works well too
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