Overhaul code coverage pipeline and Codecov configuration (#207)

Author: Kyle-Ye

.codecov.yml

@@ -1,14 +1,25 @@
 codecov:
   require_ci_to_pass: yes
+
 coverage:
   status:
     project:
       default:
-        target: auto 
-        threshold: 5
-    patch: off
-      # default:
-      #   target: auto 
-      #   threshold: 5
+        target: auto
+        threshold: 1%
+    patch:
+      default:
+        target: 70%
+        threshold: 0%
+
+flag_management:
+  default_rules:
+    carryforward: true
+
+comment:
+  layout: "header, diff, flags, files"
+  behavior: default
+  require_changes: false
+
 ignore:
-  - Tests
+  - Tests

.github/workflows/ios.yml

@@ -71,3 +71,21 @@ jobs:
             -skipPackagePluginValidation \
             -skipMacroValidation
             # OTHER_SWIFT_FLAGS="-warnings-as-errors" Conflicting options '-warnings-as-errors' and '-suppress-warnings'
+      - name: Generate iOS coverage report
+        run: |
+          # Extract profdata and binary from xcodebuild's derived data to generate
+          # llvm-cov text output (same format as macOS/Ubuntu workflows).
+          # Note: swift_project param in codecov-action doesn't auto-discover xcodebuild coverage,
+          # and xcrun xccov JSON format isn't recognized by Codecov's parser.
+          PROFDATA=$(find .build-test-debug -name "Coverage.profdata" -type f | head -1)
+          XCTEST=$(find .build-test-debug -name "*.xctest" -type d | head -1)
+          if [ -n "$PROFDATA" ] && [ -n "$XCTEST" ]; then
+            BINARY="$XCTEST/$(basename "$XCTEST" .xctest)"
+            xcrun llvm-cov show -instr-profile="$PROFDATA" "$BINARY" > coverage.txt
+          fi
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: ios
+          verbose: true

.github/workflows/macos.yml

@@ -62,7 +62,9 @@ jobs:
             -c release \
             --enable-code-coverage \
             --build-path .build-test-release
-      - uses: codecov/codecov-action@v5
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          flags: macos
           verbose: true

.github/workflows/ubuntu.yml

@@ -49,7 +49,11 @@ jobs:
           swift test \
             -c release \
             --build-path .build-test-release
-      - uses: codecov/codecov-action@v3
+      - name: Install Codecov dependencies
+        run: apt-get update && apt-get install -y curl gpg
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          flags: ubuntu
           verbose: true