Enable codecov support (#312)

- Create codecov.yml, add badge to readme
- Change flag management in codecov.yml

.github/workflows/node.js.yml

@@ -74,11 +74,18 @@ jobs:
       - name: Test (Pull Request)
         if: ${{ github.event_name == 'pull_request' }}
         run: |
-          npm run test:ci -- --changedSince origin/${{ github.event.pull_request.base.ref }}
+          npm run test:ci -- --changedSince origin/${{ github.event.pull_request.base.ref }} --collectCoverage=true
           npm run test:golden-layout
 
       - name: Test (Push)
         if: ${{ github.event_name == 'push' }}
         run: |
           npm run test:ci -- --lastCommit
           npm run test:golden-layout
+
+      - name: Codecov report
+        uses: codecov/codecov-action@v2
+        if: ${{ github.event_name == 'pull_request' }}
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: unit

README.md

@@ -2,6 +2,8 @@
 
 We're using a monorepo to manage our packages, as it becomes cumbersome to manage the overhead of multiple repos with how we wish to develop the Enterprise UI, while maintaining a separate OSS Code Studio solution. Using `lerna` to manage all of our packages in one repo simplifies the process.
 
+[![codecov](https://codecov.io/gh/deephaven/web-client-ui/branch/main/graph/badge.svg?token=RW29S9X72C)](https://codecov.io/gh/deephaven/web-client-ui)
+
 ## Getting Started
 
 We are still using node 14.x and npm 6.x. If you are [using nvm](https://github.com/nvm-sh/nvm#installing-and-updating), run `nvm install lts/fermium` to get the latest 14.x/6.x versions. Otherwise, download from the [node homepage](https://nodejs.org/en/download/).

codecov.yml

@@ -0,0 +1,3 @@
+flag_management:
+  default_rules:
+    carryforward: true

jest.config.cjs

@@ -22,16 +22,4 @@ module.exports = {
   ],
   collectCoverage: false,
   collectCoverageFrom: ['./src/**/*.{js,ts,jsx,tsx}'], // This is relative to individual project root due to how Jest handles it
-  coverageThreshold: {
-    // These global thresholds were taken as the baseline of the overall project when code coverage initiative began.
-    // In CI, these thresholds will be measures against only the files you have changed.
-    // We may want to increase/decrease the thresholds for specific projects, and we can do that:
-    // https://jestjs.io/docs/configuration#coveragethreshold-object
-    global: {
-      statements: 40,
-      branches: 30,
-      functions: 30,
-      lines: 40,
-    },
-  },
 };