make mongo tests safer to run in parallel #5707
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pants runs each test file separately in pytest. So, if two files try to modify the same database at the same time, we'll get strange results. So, modify the db name to ensure that they are safe in parallel.
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Background
I'm working towards introducing
pants. Eventually I would like to use pants to run tests to take advantage of the fine-grained per-file caching of results that accounts for dependencies by python files (pants infers the deps by reading the python files).pants runs each test file separately in pytest. So, if two files try to modify the same database at the same time, we'll get strange results.
Overview
So, modify the db name for each parallel test to ensure that they can run safely in parallel.
Once we integrate pants, we will configure (in pants.toml)
[pytest].execution_slot_var = "ST2TESTS_PARALLEL_SLOT"to take advantage of the env var introduced here.https://www.pantsbuild.org/docs/reference-pytest#section-execution-slot-var