diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 9de51d4..07f2fe9 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -54,7 +54,7 @@ flowchart LR
   end
 
   feature1 & feature2 & feature3 -- Squash Merge --> dev
-  dev -- Rebase Merge --> main
+  dev -- Merge --> main
 ```
 
 <br />
diff --git a/.github/README.md b/.github/README.md
index 95c508a..1f688e2 100644
--- a/.github/README.md
+++ b/.github/README.md
@@ -13,6 +13,7 @@
 [![Test](https://img.shields.io/github/actions/workflow/status/5ouma/opml-generator/test.yml?label=test&style=flat-square)](https://github.com/5ouma/opml-generator/actions/workflows/test.yml)
 [![Gist Update](https://img.shields.io/github/actions/workflow/status/5ouma/opml-generator/gist-update.yml?label=Gist%20Update&style=flat-square)](https://github.com/5ouma/opml-generator/actions/workflows/gist-update.yml)
 [![pre-commit.ci status](https://results.pre-commit.ci/badge/github/5ouma/opml-generator/main.svg?style=flat-square)](https://results.pre-commit.ci/latest/github/5ouma/opml-generator/main)
+[![codecov](https://codecov.io/github/5ouma/opml-generator/graph/badge.svg?token=ICJ7C3IDX7)](https://codecov.io/github/5ouma/opml-generator)
 
 </div>
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1209870..1a6f646 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,7 +29,7 @@ jobs:
           deno-version: v1.x
 
       - name: 🧪 Run Tests
-        run: deno task test
+        run: deno task cov
 
       - name: 🧹 Lint Check
         run: deno lint
@@ -39,3 +39,8 @@ jobs:
 
       - name: 🔍 Type Check
         run: deno check ./**/*.ts
+
+      - name: ☂️ Upload Coverage
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0f06f34
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/coverage
+/coverage.lcov
diff --git a/deno.json b/deno.json
index d9b5f65..6a6f354 100644
--- a/deno.json
+++ b/deno.json
@@ -4,7 +4,8 @@
   "test": { "include": ["src/", "test/"] },
   "tasks": {
     "gen": "deno run --allow-read --allow-write ./src/main.ts",
-    "test": "deno test --allow-read --allow-write --parallel --shuffle"
+    "test": "deno test --allow-read --allow-write --parallel --shuffle",
+    "cov": "deno task test --coverage && deno coverage --lcov > coverage.lcov"
   },
   "imports": {
     "@libs/xml": "jsr:@libs/xml@5.4.7",