Add Foundry tests to coverage

.github/workflows/checks.yml

@@ -91,6 +91,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
+      - name: Install LCOV
+        run: sudo apt-get install lcov
       - name: Run coverage
         run: npm run coverage
       - uses: codecov/codecov-action@v4

package.json

@@ -10,7 +10,7 @@
   "scripts": {
     "compile": "hardhat compile",
     "compile:harnesses": "env SRC=./certora/harnesses hardhat compile",
-    "coverage": "env COVERAGE=true hardhat coverage",
+    "coverage": "scripts/checks/coverage.sh",
     "docs": "npm run prepare-docs && oz-docs",
     "docs:watch": "oz-docs watch contracts docs/templates docs/config.js",
     "prepare": "git config --local core.hooksPath .githooks",

scripts/checks/coverage.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+export COVERAGE=true
+export FOUNDRY_FUZZ_RUNS=10
+
+# Hardhat coverage
+npx hardhat coverage
+
+# Foundry coverage
+forge coverage --report lcov
+# Remove test and mock data
+lcov --rc derive_function_end_line=0 -o lcov.info --remove lcov.info 'test/*' 'contracts/mocks/*'
+# Remove zero hits
+awk '!/,0/' lcov.info > temp && mv temp lcov.info
+
+# Reports are then uploaded to Codecov automatically by workflow, and merged.