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rpl/generate_jscov_report_from_firefox_tests.md

Last active September 7, 2017 14:28
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Locally generate JS coverage reports from Firefox tests
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generate_jscov_report_from_firefox_tests.md

Generate JSCOV reports from mochitest and xpcshell tests locally

  • create the directory where the lcov files will be stored
 mkdir /tmp/JSCOV
  • generate the lcov files:
 JS_CODE_COVERAGE_OUTPUT_DIR=/tmp/JSCOV ./mach test PATH/TO/TEST/FILE ...
  • generate chrome-map.json (needed by lcov_rewriter)
 ./mach build-backend -b ChromeMap
  • rewrite urls in the generated lcov reports (rewrites chrome and resource urls to path to files)
 ./mach python python/mozbuild/mozbuild/codecoverage/lcov_rewriter.py /tmp/JSCOV/*.info
  • generate HTML report from the rewritten lcov reports (using genhtml binary from the lcov tools)
genhtml /tmp/JSCOV/*.info.out -o /tmp/JSCOV-HTML/
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