Test split outputs warning: "Error reading historical timing data: file does not exist"

circleci tests split can output the following warning:

Error reading historical timing data: file does not exist

This can happen for several reasons including, but not limited to:

  1. The job parallelism is set to 1. Parallelism needs to be set to at least 2 to generate and attach historical timing data
  2. The test splitting job has not had a successful test run that generated the appropriate JUnit XML or Cucumber JSON formatted test results file
  3. The test results files are not stored via store_test_results
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