☕ Use Codecov to check coverage

Author: lambdalisue

.github/workflows/test.yml

@@ -38,3 +38,8 @@ jobs:
         run: |
           deno task test
         timeout-minutes: 5
+      - run: |
+          deno coverage --unstable .coverage --lcov > coverage.lcov
+      - uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.lcov