Ci/coverage badge (#191)

* ci: coverage badge

.github/workflows/ci.yml

@@ -5,8 +5,12 @@ on:
     branches: [ main, release ]
     tags:
       - 'release-*'
+    paths-ignore:
+      - "**/coverage.svg"
   pull_request:
     branches: [ main, release ]
+    paths-ignore:
+      - "**/coverage.svg"
 
 env:
   CARGO_TERM_COLOR: always
@@ -101,6 +105,8 @@ jobs:
   coverage:
     name: Code Coverage
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v3
 
@@ -130,8 +136,19 @@ jobs:
       - name: Install llvm-tools-preview
         run: rustup component add llvm-tools-preview
 
+      - name: Install lcov
+        run: sudo apt-get update && sudo apt-get install -y lcov bc
+
       - name: Run tests with coverage
-        run: cargo llvm-cov --all-features
+        run: cargo llvm-cov --all-features --lcov --output-path lcov.info
+
+      - name: Generate coverage badge
+        if: github.ref == 'refs/heads/main'
+        uses: GoogleCloudPlatform/lcov-coverage-badge@5857899449990297b622767f36e4fa8d1218acdb
+        with:
+          file: ./lcov.info
+          icon_name: github
+          access_token: ${{ secrets.GITHUB_TOKEN }}
   
   security_audit:
     name: Security Audit

README.md

@@ -7,6 +7,7 @@
 [![Crates.io Version](https://img.shields.io/crates/v/rmcp)](https://crates.io/crates/rmcp)
 ![Release status](https://github.com/modelcontextprotocol/rust-sdk/actions/workflows/release.yml/badge.svg)
 [![docs.rs](https://img.shields.io/docsrs/rmcp)](https://docs.rs/rmcp/latest/rmcp)
+![Coverage](coverage.svg)
 
 An official rust Model Context Protocol SDK implementation with tokio async runtime.