TL;DR

Run GenerateTestData.java.

Structure

There are currently 5 directories in common/testData. Each also has a _readme.txt with copyright information for all the files in that directory. The format of the files in the directory is either in the individual data files, or in the _readme.txt

• localeIdentifiers — generated data (GenerateLocaleIDTestData, GenerateLikelySubtagTests)
  • localeCanonicalization.txt
  • localeDisplayName.txt
  • likelySubtags.txt
• personNameTest — generated data (GeneratePersonNameTestData)
  • af.txt
  • am.txt
  • …
• segmentation — curated data (not generated)
  • graphemeCluster
    • TestSegmenter-Bengali.txt
    • TestSegmenter-Devanagari.txt
    • …
• transforms — curated data (not generated)
  • am-fonipa-t-am.tx
  • am-Latn-t-am-m0-bgn.txt
  • am-t-am-fonipa.txt
  • …
• units — generated data (TestUnits)
  • unitPreferencesTest.txt
  • unitsTest.txt