test: add cargo coverage test

.gitignore

@@ -27,3 +27,6 @@
 /lib
 /venv
 /node_modules
+
+# coverage
+*.profraw

coverage.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+set -e
+
+# Prerequisites:
+# rustup component add llvm-tools-preview
+# cargo install rustfilt
+# cargo install grcov@0.5.1
+# or download grcov from https://github.com/mozilla/grcov/releases
+
+export RUSTC_BOOTSTRAP=1
+
+# Create the directory for coverage reports
+mkdir -p target/coverage
+
+# Clean any previous coverage data
+rm -rf target/coverage/*
+
+# Clean previous build artifacts to ensure coverage instrumentation is applied
+cargo clean
+rm -f *.profraw
+
+export RUSTFLAGS="-Cinstrument-coverage"
+
+# Build the project with coverage instrumentation
+
+cargo build --verbose
+
+# Set environment variables for coverage
+export CARGO_INCREMENTAL=0
+export RUSTFLAGS="-C instrument-coverage -Zprofile -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort"
+export RUSTDOCFLAGS="-Cpanic=abort"
+export LLVM_PROFILE_FILE="target/coverage/coverage-%p-%m.profraw"
+
+# Run tests with coverage instrumentation
+cargo test --no-fail-fast --verbose
+
+# List all the profraw files to verify they were created
+echo "Generated profraw files:"
+# ls -la target/coverage/
+
+# Generate coverage report
+# target/coverage
+grcov . --binary-path ./target/debug -s . -t html --branch --ignore-not-existing --ignore "/*" --ignore "target/*" --ignore "tests/*" --ignore "examples/*" -o target/coverage/html
+
+# Generate a summary report
+grcov . --binary-path ./target/debug -s . -t lcov --branch --ignore-not-existing --ignore "/*" --ignore "target/*" --ignore "tests/*" --ignore "examples/*" -o target/coverage/lcov.info
+
+# Print a message with the location of the coverage report
+echo "Coverage report generated at target/coverage/html/index.html"
+
+ls -la *.profraw
+rm -rf *.profraw
+
+# Start a local web server to view the coverage report
+cd target/coverage/html && python3 -m http.server 8080
+# open http://localhost:8080/src/yul2ir/index.html