fix(ci): collect coverage for both unit and integration tests

.github/workflows/coverage.yml

@@ -8,7 +8,10 @@ on:
 
 jobs:
   coverage:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
 
@@ -19,12 +22,23 @@ jobs:
 
       - name: Test
         run: |
-          mkdir covdatafiles
-          GOCOVERDIR=$PWD/covdatafiles \
-            go test -failfast -race -coverpkg=./... -covermode=atomic -coverprofile=coverage.txt ./... -timeout 5m
+          # We collect coverage data from two sources,
+          # 1) unit tests 2) integration tests
+          #
+          # https://go.dev/testing/coverage/
+          # https://dustinspecker.com/posts/go-combined-unit-integration-code-coverage/
+          # https://github.com/golang/go/issues/51430#issuecomment-1344711300
+          mkdir -p coverage/{unit,integration}
 
-          # Convert coverage data to legacy format
-          go tool covdata textfmt -i=covdatafiles -o=covdata.txt
+          # Collect integration tests coverage
+          GOCOVERDIR=$PWD/coverage/integration go test -failfast -race -timeout 5m ./...
+
+          # Collect unit tests coverage
+          go test -failfast -race -timeout 5m -cover ./... -args -test.gocoverdir=$PWD/coverage/unit
+
+          # Convert coverage data to legacy textfmt format to upload
+          go tool covdata textfmt -i=coverage/unit -o=unit.txt
+          go tool covdata textfmt -i=coverage/integration -o=integration.txt
       - uses: codecov/codecov-action@v3
         with:
-          files: coverage.txt,covdata.txt
+          files: unit.txt,integration.txt