Add --shard flag for splitting tests across parallel CI jobs
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With this commit, mighty_test can now distribute test files evenly across parallel CI jobs, using the `--shard` option. The _shard_ nomenclature has been borrowed from similar features in [Jest](https://jestjs.io/docs/cli#--shard) and [Playwright](https://playwright.dev/docs/test-sharding). ```sh # Run the 1st group of tests out of 4 total groups bin/mt --shard 1/4 ``` Test files are shuffled before dividing into shards. To ensure the shuffle is consistent across CI nodes, the SHA of the git commit being tested is used as the random seed. If the SHA cannot be determined, a hard-coded seed is used.
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With this commit, mighty_test can now distribute test files evenly across parallel CI jobs, using the
--shardoption. The shard nomenclature has been borrowed from similar features in Jest and Playwright.# Run the 1st group of tests out of 4 total groups bin/mt --shard 1/4Test files are shuffled before dividing into shards. To ensure the shuffle is consistent across CI nodes, the SHA of the git commit being tested is used as the random seed. If the SHA cannot be determined, a hard-coded seed is used.