Upload front-end code coverage to codecov.io (#17440)

* Tweak Codecov settings to account for front-end coverage
* Scope back-end coverage with the correct codecov flag
* Add enterprise/frontend

.circleci/config.yml

@@ -1014,7 +1014,8 @@ workflows:
           after-steps:
             - run:
                 name: Upload code coverage to codecov.io
-                command: bash <(curl -s https://codecov.io/bash)
+                command: bash <(curl -s https://codecov.io/bash) -F back-end
+
           skip-when-no-change: true
 
       - test-driver:

.github/workflows/frontend.yml

@@ -96,8 +96,13 @@ jobs:
         path: ~/.cache/yarn
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
     - run: yarn install --frozen-lockfile --prefer-offline
-    - run: yarn run test-unit
+    - run: yarn run test-unit --coverage --silent
       name: Run frontend unit tests
+    - name: Upload coverage to codecov.io
+      uses: codecov/codecov-action@v2
+      with:
+        files: ./coverage/lcov.info
+        flags: front-end
 
   fe-tests-timezones:
     runs-on: ubuntu-20.04

codecov.yml

@@ -5,12 +5,40 @@ codecov:
 coverage:
   status:
     project:
-      default:
+      back-end:
         # Project must always have at least 78% coverage (by line)
         target: 78%
         # Whole-project test coverage is allowed to drop up to 5%. (For situtations where we delete code with full coverage)
         threshold: 5%
+        flags:
+          - back-end
+
+      front-end:
+        target: 35%
+        threshold: 5%
+        flags:
+          - front-end
+
     patch:
-      default:
+      back-end:
         # Changes must have at least 75% test coverage (by line)
         target: 75%
+        flags:
+          - back-end
+
+      front-end:
+        target: 35%
+        flags:
+          - front-end
+
+flags:
+  back-end:
+    paths:
+      - enterprise/backend
+      - shared/src
+      - src/metabase
+
+  front-end:
+    paths:
+      - enterprise/frontend
+      - frontend
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