chore(unit): fix re-add jest-silent-reporter to unit test CI output (gatsbyjs#24071)

* chore(unit): fix jest report by generating default reporters

* ⚠️ to remove, example of failing test with report

* ignore lint

* reuse jest reporters config from jest.config.js

* we weren't tracking coverage anyway

* forcing failing assertion

* fixup purposely failing test

Co-authored-by: Michal Piechowiak <[email protected]>

Author: Slashgear

.circleci/config.yml

@@ -67,8 +67,9 @@ aliases:
       - <<: *attach_to_bootstrap
       - run: yarn list react
       - run:
-          command: node --max-old-space-size=2048 ./node_modules/.bin/jest -w 1 --ci --reporters=jest-junit
+          command: node --max-old-space-size=2048 ./node_modules/.bin/jest -w 1 --ci
           environment:
+            GENERATE_JEST_REPORT: true
             JEST_JUNIT_OUTPUT_DIR: ./test-results/jest-node/
             JEST_JUNIT_OUTPUT_NAME: results.xml
       - store_test_results:

jest.config.js

@@ -40,19 +40,11 @@ module.exports = {
     "^highlight.js$": `<rootDir>/node_modules/highlight.js/lib/index.js`,
   },
   snapshotSerializers: [`jest-serializer-path`],
-  collectCoverage: useCoverage,
-  coverageReporters: [`json-summary`, `text`, `html`, `cobertura`],
-  coverageThreshold: {
-    global: {
-      lines: 45,
-      statements: 44,
-      functions: 42,
-      branches: 43,
-    },
-  },
   collectCoverageFrom: coverageDirs,
   reporters: process.env.CI
-    ? [[`jest-silent-reporter`, { useDots: true }]]
+    ? [[`jest-silent-reporter`, { useDots: true }]].concat(
+        useCoverage ? `jest-junit` : []
+      )
     : [`default`].concat(useCoverage ? `jest-junit` : []),
   testEnvironment: `jest-environment-jsdom-fourteen`,
   moduleFileExtensions: [`js`, `jsx`, `ts`, `tsx`, `json`],