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eac0a3ebee
As described in #1033: Currently, developers in environments without gnu coreutils (notably: macOS) get an extremely confusing error message when they run `yarn test`. This commit ensures that such users instead get a helpful message with a link to the fix. Follows @wchargin's proposed approach for fixing #1033, so that Mac developers get clear guidance on how to get their development environment working properly. Expected behavior is that `yarn test` passes when GNU coreutils are present, and fails with the following message when they are not: Fixes #1033 ``` FAIL check-gnu-coreutils Exit code: 1 Contents of stdout: /home/dandelion/git/sc/sourcecred Contents of stderr: Error: Your environment does not provide GNU coreutils You're likely developing on macOS. Please see the following link for a fix: https://github.com/sourcecred/sourcecred/issues/698#issuecomment-417202213 ``` Test plan: Verify that on a machine with gnu coreutils present, the command passes and does not print irrelevant output. Verify that on a machine without gnu coreutils available, the command fails, and prints exactly the error message expected, without any extra output related to the test's implementation. Paired-with: @anthrocypher