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# GitLab tests in the Continuous Integration (CI) context
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### Test suite parallelization on the CI
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Our current CI parallelization setup is as follows:
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1. The `knapsack` job in the prepare stage that is supposed to ensure we have a
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`knapsack/${CI_PROJECT_NAME}/rspec_report-master.json` file:
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- The `knapsack/${CI_PROJECT_NAME}/rspec_report-master.json` file is fetched
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from S3, if it's not here we initialize the file with `{}`.
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1. Each `rspec x y` job are run with `knapsack rspec` and should have an evenly
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distributed share of tests:
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- It works because the jobs have access to the
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`knapsack/${CI_PROJECT_NAME}/rspec_report-master.json` since the "artifacts
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from all previous stages are passed by default".
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- the jobs set their own report path to
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`KNAPSACK_REPORT_PATH=knapsack/${CI_PROJECT_NAME}/${JOB_NAME[0]}_node_${CI_NODE_INDEX}_${CI_NODE_TOTAL}_report.json`.
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- if knapsack is doing its job, test files that are run should be listed under
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`Report specs`, not under `Leftover specs`.
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1. The `update-knapsack` job takes all the
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`knapsack/${CI_PROJECT_NAME}/${JOB_NAME[0]}_node_${CI_NODE_INDEX}_${CI_NODE_TOTAL}_report.json`
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files from the `rspec x y` jobs and merge them all together into a single
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`knapsack/${CI_PROJECT_NAME}/rspec_report-master.json` file that is then
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uploaded to S3.
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2018-03-17 18:26:18 +05:30
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After that, the next pipeline will use the up-to-date
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`knapsack/${CI_PROJECT_NAME}/rspec_report-master.json` file.
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### Monitoring
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The GitLab test suite is [monitored] for the `master` branch, and any branch
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that includes `rspec-profile` in their name.
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[monitored]: ../performance.md#rspec-profiling
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## CI setup
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- On CE and EE, the test suite runs both PostgreSQL and MySQL.
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- Rails logging to `log/test.log` is disabled by default in CI [for
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performance reasons][logging]. To override this setting, provide the
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`RAILS_ENABLE_TEST_LOG` environment variable.
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[logging]: https://jtway.co/speed-up-your-rails-test-suite-by-6-in-1-line-13fedb869ec4
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---
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[Return to Testing documentation](index.md)
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