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react-native-devtools-frontend/node_modules/stylelint/docs/developer-guide/system-tests.md
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Mathias Bynens 79e2cf0633 Add stylelint dependency
This also adds CC-BY-4.0 to the list of accepted licenses.

DISABLE_THIRD_PARTY_CHECK=update dependencies

Bug: chromium:1083142
Change-Id: I8612de2fba52dae32eeb71af79d5aacfde52142b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2220097
Reviewed-by: Paul Lewis <aerotwist@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
2020-06-11 06:20:04 +00:00

965 B

Writing system tests

System tests verify that stylelint works as expected. They are another line of defense against regressions, after the unit tests and integration tests.

Each of these system tests asserts that we end up with some expected output, given a configuration and a stylesheet.

These tests should not be comprehensive and systematic (the unit tests should). They should reproduce real use-cases and verify that those use-cases work as expected.

Jest snapshots

The tests use Jest snapshots, so we can easily:

  • assert against potentially large objects and strings
  • update expectations as needed.

The pattern

To add a system test, you should:

  • add a test-case folder to system-tests/ incrementing the number from existing test cases
  • add a configuration file and a stylesheet
  • add a fs.test.js and no-fs.test.js following the format established by existing tests, and using the systemTestUtils
  • take a snapshot of output