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Add Jest JSON reporter

Richard Chongrequested to merge
da-jest-json-reporter into master

What does this MR do and why?

Add Jest JSON reporter for coverage export to ClickHouse

Implements a custom Jest reporter that outputs test metadata in JSON format matching the RSpec JSON formatter structure. This is a pre-requisite to allow the gitlab_quality-test_tooling gem to export frontend test coverage to ClickHouse alongside backend coverage.

The reporter:

  • Generates JSON reports per CI shard (using CI_NODE_INDEX)
  • Matches RSpec formatter output structure for gem compatibility
  • Sets feature_category to null (Jest tests don't have categories yet)
  • Collected as artifacts by coverage-frontend job

Related: gitlab-org/quality/analytics/team#317 (closed)

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Before After

How to set up and validate locally

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Edited by Richard Chong

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