DO NOT MERGE: native iOS coverage setup (local harness fork)

[mfazekas]

Do not merge — this PR contains local file: and portal: references to the react-native-harness fork.

What this does

Sets up native iOS code coverage collection using @react-native-harness/coverage-ios from the mfazekas/react-native-harness fork (feat/native-ios-coverage branch).

How to use

Prerequisites: clone the harness fork at /Users/boga/Work/Margelo/react-native-harness and check out feat/native-ios-coverage.

yarn install
cd example/ios && pod install  # should print [HarnessCoverage] Instrumenting pods
cd ..

# Build with Xcode 16.4 (not Xcode 26 beta)
DEVELOPER_DIR=/Applications/Xcode16.4.app/Contents/Developer xcodebuild build \
  -workspace ios/RiveExample.xcworkspace -scheme RiveExample \
  -sdk iphonesimulator -destination "platform=iOS Simulator,name=iPhone 16 Pro,OS=18.6" \
  -derivedDataPath ios/build

# Install on the correct simulator
xcrun simctl install "iPhone 16 Pro" ios/build/Build/Products/Debug-iphonesimulator/RiveExample.app

# Run tests
yarn test:harness:ios:coverage

# Collect native coverage manually
xcrun llvm-profdata merge -sparse /tmp/harness-coverage/*.profraw -o coverage/native-ios.profdata
xcrun llvm-cov export --format=lcov \
  --instr-profile=coverage/native-ios.profdata \
  ios/build/Build/Products/Debug-iphonesimulator/RiveExample.app/RiveExample.debug.dylib \
  > coverage/native-ios.lcov

# HTML report
genhtml coverage/native-ios.lcov -o coverage/native-ios-html \
  --ignore-errors inconsistent,corrupt,unsupported
open coverage/native-ios-html/index.html

Known issue

The resolve-coverage-pods.mjs script needs NODE_OPTIONS="--preserve-symlinks" when using portal resolutions. After yarn install, manually patch node_modules/@react-native-harness/coverage-ios/scripts/harness_coverage_hook.rb line 19 to add this. This will be fixed upstream.

See NATIVE_IOS_COVERAGE_INTEGRATION.md for full details.