Tests for the InfluxDB client

[suvayu]

... add a step in CI that starts an influxdb container with an endpoint and some data.

Originally posted by @suvayu in #19 (comment)

• Implement a test that runs with EDR but is not included in CI
• Implement a step in CI that spins up an InfluxDB instance, populates with dummy data, and runs the above test against this instance

[clizbe]

@wcoenraads Can you write these tests? :)

[wcoenraads]

I can - but frankly, I think my time would be better spent elsewhere for now. These tests will be useful when we get more code relying on this functionality, and it would enable better testing then. But for now, these tests are quite a lot of work to create for what is literally 40 lines of simple code. So I would prefer to defer this work until it becomes more relevant.

[suvayu]

@wcoenraads Do you think the first point is also a lot of effort? I would say if we can address the first one, and leave the more complete approach for later, it is a lot better.