diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ed34571..3a5cdbe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ on:
     branches: [main]
 
 jobs:
-  lint-and-format:
+  lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
@@ -17,15 +17,51 @@ jobs:
           cache: 'npm'
 
       - run: npm ci
+      - run: npm run lint
 
-      - name: Lint
-        run: npm run lint
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+          cache: 'npm'
 
-      - name: Format check
-        run: npm run format:check
+      - run: npm ci
+      - run: npm run format:check
 
-      - name: Type check
-        run: npm run compile
+  type-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+          cache: 'npm'
 
-      - name: Test
-        run: npm test
+      - run: npm ci
+      - run: npm run compile
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - run: npm ci
+
+      - name: Test with coverage
+        run: npm run test:coverage
+
+      - name: Upload coverage to Codecov
+        if: env.CODECOV_TOKEN != ''
+        uses: codecov/codecov-action@v5
+        with:
+          files: coverage/lcov.info
+          fail_ci_if_error: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 96765d8..76a89c9 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # GitHub Webhook Manager
 
+[![codecov](https://codecov.io/gh/seiya-koji/github-webhook-manager/graph/badge.svg)](https://codecov.io/gh/seiya-koji/github-webhook-manager)
 [![VS Marketplace Version](https://badgen.net/vs-marketplace/v/seiya-koji.github-webhook-manager?label=version)](https://marketplace.visualstudio.com/items?itemName=seiya-koji.github-webhook-manager)
 [![VS Marketplace Installs](https://badgen.net/vs-marketplace/i/seiya-koji.github-webhook-manager?label=installs)](https://marketplace.visualstudio.com/items?itemName=seiya-koji.github-webhook-manager)
 [![VS Marketplace Rating](https://badgen.net/vs-marketplace/rating/seiya-koji.github-webhook-manager?label=rating)](https://marketplace.visualstudio.com/items?itemName=seiya-koji.github-webhook-manager)
diff --git a/package-lock.json b/package-lock.json
index 5332790..4a45e62 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "@eslint/js": "^10.0.1",
         "@types/node": "^20",
         "@types/vscode": "^1.85.0",
+        "@vitest/coverage-v8": "^4.1.9",
         "@vscode/vsce": "^3.0.0",
         "esbuild": "^0.25.0",
         "eslint": "^10.5.0",
@@ -231,6 +232,16 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-string-parser": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
+      "integrity": "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/helper-validator-identifier": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.29.7.tgz",
@@ -241,6 +252,46 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/parser": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.7.tgz",
+      "integrity": "sha512-hnORnjP/1P/zFEndoeX+n+t1RwWRJiJpM/jO7FW32Kn9r5+sJB2JWOdYo4L6k78j15eCwY3Gm/7364B1EMwtNg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/types": "^7.29.7"
+      },
+      "bin": {
+        "parser": "bin/babel-parser.js"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@babel/types": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.7.tgz",
+      "integrity": "sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-string-parser": "^7.29.7",
+        "@babel/helper-validator-identifier": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@commitlint/cli": {
       "version": "21.2.0",
       "resolved": "https://registry.npmjs.org/@commitlint/cli/-/cli-21.2.0.tgz",
@@ -1172,6 +1223,16 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
@@ -1179,6 +1240,17 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.31",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.1.6",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.6.tgz",
@@ -1421,9 +1493,9 @@
       }
     },
     "node_modules/@oxc-project/types": {
-      "version": "0.137.0",
-      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.137.0.tgz",
-      "integrity": "sha512-WT+Gb24i8hmvo85AIv2oEYouEXkRlKAlT9WaCa3TfLgNCN+GhrJOGZuIlMouAh38Qe4QOx26eUOVsq70qXrywA==",
+      "version": "0.139.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.139.0.tgz",
+      "integrity": "sha512-r9gHphtCs+1M7J0pw6Sn/hh/Wpa/iQrOOkrNAlVLF/gHq+/CJmHIWKKUUhdWjcD6CIa8idarspCsASiXCXvFUw==",
       "dev": true,
       "license": "MIT",
       "funding": {
@@ -1431,9 +1503,9 @@
       }
     },
     "node_modules/@rolldown/binding-android-arm64": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.1.3.tgz",
-      "integrity": "sha512-DT6Z3PhvioeHMvxo+xHc3KtqggrI7CCTXCmC2h/5zUlp5jVitv7XEy+9q5/7v8IolhlioawpMo8Kg0EEBy7J0g==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.1.5.tgz",
+      "integrity": "sha512-lZg8fqIv2v7FF237bwMgzGZEJvGL79/s5knJ/i6FmsGF4XXlzccZ4jb+TrFIxtSSxFtIpdsgrPZeMk1I9AFcyQ==",
       "cpu": [
         "arm64"
       ],
@@ -1448,9 +1520,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-arm64": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.1.3.tgz",
-      "integrity": "sha512-0NwgwsjM7LrsuVnXMK3koTpagBNOhloc/BNjKqZjv4V5zI5r13qx69uVhRx+o5Z0yy4Hzq+lpy7TAgUG/ocvrw==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.1.5.tgz",
+      "integrity": "sha512-51Bnx9pNiMRKSUNtBfySkNJ9vMU9Hh3I1ozDd6gyPPYzaXCfnptUcEZxXGYFn+ul2dtcMUiqGR1Yai2K10uoTw==",
       "cpu": [
         "arm64"
       ],
@@ -1465,9 +1537,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-x64": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.1.3.tgz",
-      "integrity": "sha512-YtiBp4disu6V560loT6PjMdiRaWmVvDNrUunAalbiFx2ggeJwxdAsgZMcoGP17uyAsTwAj5V1niksxlHnVQ1Sw==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.1.5.tgz",
+      "integrity": "sha512-Tm+gbfC0aHu1tBA/JvKQh32S0K6YgCHkiAF4/W6xX0K0RmNuc94VeK419dJoE65R5aRxmo+noZQSWrAMF6yb6g==",
       "cpu": [
         "x64"
       ],
@@ -1482,9 +1554,9 @@
       }
     },
     "node_modules/@rolldown/binding-freebsd-x64": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.1.3.tgz",
-      "integrity": "sha512-yD3EkEdXk2LypPxnf/kSZHirarsI8gcPzc62SukhR9VJTyvV+F9Q/GxWNuCojc7sXyuVC4DxRGhdDK4X8VSsbw==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.1.5.tgz",
+      "integrity": "sha512-JMzDKCCXq93YccG5gz3hvOs1oXRKAf0XYpfOS88e+wZrC8Iugj6j68867vrYZkvpDDpKn/KoKORThmchMpF6TA==",
       "cpu": [
         "x64"
       ],
@@ -1499,9 +1571,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.1.3.tgz",
-      "integrity": "sha512-c+8vieQbsD7HNAHKIA34w0GJ9FedFFuJGD+7E6vz7Q3uqAIugL5p45fhlsj4UaAsHpcmlqugBWMhA0/j7o0sIg==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.1.5.tgz",
+      "integrity": "sha512-uML21j2K5TfPGutKxub+M+nLjZIrWjXQ5Grx4lCe/nimTj9B4L63zHpjXLl4y0L3mcm2htEQIb06oCG/szerNw==",
       "cpu": [
         "arm"
       ],
@@ -1516,9 +1588,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-gnu": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.1.3.tgz",
-      "integrity": "sha512-50jD0uUwLvur7Zz9LHz17kaAdTPjn5wN93hEgjvmYFRZwiR7ZJYovTd5ipyWJDAnXKvZ+wgc+/Ika6dwSF5OcA==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.1.5.tgz",
+      "integrity": "sha512-navSiuTMogvnQoZoM/v+l3ZWo50/NTwSHSzheABx/RCnmUPaKwq9qSo4Br2OYRs21+Fz8uFqITZM3H4opOB0/Q==",
       "cpu": [
         "arm64"
       ],
@@ -1533,9 +1605,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-musl": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.1.3.tgz",
-      "integrity": "sha512-BO9+oPL8K9poZJBfYPsXNtYjPE5uM3qeehT3aFcW4LITOl+iSqhp0abzjR2nWBUNjIZeKXjAEWBZ64WjNoHd6w==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.1.5.tgz",
+      "integrity": "sha512-lAryqH7IteztmCXQXk0etKj4wBQ7Gx5S6LjKhsgp9zb8I5bsuvU/2llH1hDQcjsFeqIsovMVN339/8pUDDBXxA==",
       "cpu": [
         "arm64"
       ],
@@ -1550,9 +1622,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-ppc64-gnu": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.1.3.tgz",
-      "integrity": "sha512-f3VpLB1vQ0Eo6ecr/6cekLnvYMFF4YBFoVGkfkvPLq1bAkbAwHYQPZKoAmG6OJyTcxxoC+AvezGx/S1obNC0Mw==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.1.5.tgz",
+      "integrity": "sha512-fsK/sNBnxzBlL4O1JNrZakVQxPspqpED5dLtNsZS9oOKmtSpdNIzxH2kkol5HYTWJN47sE20ztMJPxfZ89qGOg==",
       "cpu": [
         "ppc64"
       ],
@@ -1567,9 +1639,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-s390x-gnu": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.1.3.tgz",
-      "integrity": "sha512-AmurZ26Pqx/RI9N1gzEOCklkKXl927yjfXWUUS0O7Puh8ARM/Ob8qfrD3qnWksScdw6cSrW5PSHE9DyLu7+PtA==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.1.5.tgz",
+      "integrity": "sha512-gLYb4BIadlfTOYT5gO503n8zQjXflgzpD0FcyKh0Mzx3rqCZKnHoJWV9xe1KXUJ5lx2JfcSHr/mhzS0PC/McAA==",
       "cpu": [
         "s390x"
       ],
@@ -1584,9 +1656,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-gnu": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.1.3.tgz",
-      "integrity": "sha512-JJpqs8bRGITDOdbkNKnlojzBabbOHrqjSvDr0IVsZObE1lBcPjxItUEY9eWIDbxaJ3cGrXPWGfGkIxFijg/URg==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.1.5.tgz",
+      "integrity": "sha512-FjcpEKUyJygHgs1o50VYNvkt5+7Le/VEdYt0AkRpkL33MnyQfwr8l5mXwMmfmTbyMPr5vJLC+8/Gd9gXnwU1QQ==",
       "cpu": [
         "x64"
       ],
@@ -1601,9 +1673,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-musl": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.1.3.tgz",
-      "integrity": "sha512-rSJcdjPxzA/by/6/rYs+v+bXU7UjvnbUWz8MJb6kh6+knqB1dCrtHg0uu7C/4haqJvqdkYHQ5IGn+tCH9GLW/g==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.1.5.tgz",
+      "integrity": "sha512-Me+PfPI2TMeOQk0gYWfLQZtTktrmzbr8cDboqX83XKc7UrgAi55gF+2dUkWdxd19n55Essp2yeca+O9N5rBxHg==",
       "cpu": [
         "x64"
       ],
@@ -1618,9 +1690,9 @@
       }
     },
     "node_modules/@rolldown/binding-openharmony-arm64": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.1.3.tgz",
-      "integrity": "sha512-hQ3/PYkDJICgevvyNcVrihVeqq7k1Pp3VZ9lY+dauAYUJKO+auqApvANhvR1An9BhmqYKvW2Mu1F9u4DXSMLxQ==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.1.5.tgz",
+      "integrity": "sha512-yc5WrLzXks6zCQfn9Oxr8pORKyl/pF+QjHmW/Qx3qu0oyrrNC+y2JLTU1E2rcWYAmzlnqngWXHQjy51VzW70Vw==",
       "cpu": [
         "arm64"
       ],
@@ -1635,9 +1707,9 @@
       }
     },
     "node_modules/@rolldown/binding-wasm32-wasi": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-wasm32-wasi/-/binding-wasm32-wasi-1.1.3.tgz",
-      "integrity": "sha512-Elcv/BtML9lXrV6JuKITc/grN2kYV9gjsQpW8Jfw4ioK0TOkjBjye0nnyqQNy9STNaI20lXNaQBRrD5gSgR0Yg==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-wasm32-wasi/-/binding-wasm32-wasi-1.1.5.tgz",
+      "integrity": "sha512-VbQGPX2b4r48TAMIM2cjgluIM1HYutm4pcTEJsle7iEP7sB1dFqtPLBVbdLAZCxy1txCcPxf4QFf4v8uvltPqA==",
       "cpu": [
         "wasm32"
       ],
@@ -1654,9 +1726,9 @@
       }
     },
     "node_modules/@rolldown/binding-win32-arm64-msvc": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.1.3.tgz",
-      "integrity": "sha512-2DrEfhluH9yhiaFApmsjsjwrSYbNcY1oFTzYSP1a535jDbV98zCFanA/96TBUd0iDFcxGmw9QRExwGCXz3U+/g==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.1.5.tgz",
+      "integrity": "sha512-gHv82k63z4qpV5+Q1y/12KrK0ltWBukVDI8nZcbT7Tt/ZlOIVwppazneq0F93oDxTo3IgAMEDIoQh3E2n6mVsw==",
       "cpu": [
         "arm64"
       ],
@@ -1671,9 +1743,9 @@
       }
     },
     "node_modules/@rolldown/binding-win32-x64-msvc": {
-      "version": "1.1.3",
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-      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.9.tgz",
-      "integrity": "sha512-EVkXzBjrPGM+cK8/ANWgBrkUCfJfb38/EfTSO8h7pWvKkyPkpWxvR7BkD2MyItMF62C97zAEoqdpUixwR/e+Rw==",
+      "version": "4.1.10",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.10.tgz",
+      "integrity": "sha512-v0xaezt+DKEmKfaxg133ldzADrwLGd7Ze1MfQQTYfvs8OqZIwbxyxaYURivwV7sWy5fqn3rH5uOrSp07bp44Ow==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/spy": "4.1.9",
+        "@vitest/spy": "4.1.10",
         "estree-walker": "^3.0.3",
         "magic-string": "^0.30.21"
       },
@@ -7905,9 +8101,9 @@
       }
     },
     "node_modules/vitest/node_modules/picomatch": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
-      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.5.tgz",
+      "integrity": "sha512-RvwwcruNjI1ncT5xRakeyS9Lf8lcItv34KD+aif+VH9kduAyfYBipGh12274xtenIPZ119/R9BdTBa8gAwSh0A==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -7918,16 +8114,16 @@
       }
     },
     "node_modules/vitest/node_modules/vite": {
-      "version": "8.1.1",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.1.tgz",
-      "integrity": "sha512-X/05/cT+VITy2AeDc1der6smvGWWREtL4hPbPTaVbjSBuuWkmNOjR6HP3NzqcQA2nF6VHGUPaFRJyft/2AE9Kg==",
+      "version": "8.1.4",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.4.tgz",
+      "integrity": "sha512-bTT9PsdWO+MQMNG9ZXIP/qM9wGh37DFxTV/sPq9cFpHr3w4jkgef032PkAL9jAqhk3Nz8NQw3O8n6/xFkqO4QQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "lightningcss": "^1.32.0",
-        "picomatch": "^4.0.4",
+        "picomatch": "^4.0.5",
         "postcss": "^8.5.16",
-        "rolldown": "~1.1.3",
+        "rolldown": "~1.1.4",
         "tinyglobby": "^0.2.17"
       },
       "bin": {
diff --git a/package.json b/package.json
index 2c6c8bf..4fc1f86 100644
--- a/package.json
+++ b/package.json
@@ -122,6 +122,7 @@
     "package": "vsce package --no-dependencies",
     "prepare": "husky",
     "test": "vitest run",
+    "test:coverage": "vitest run --coverage",
     "lint": "eslint src",
     "lint:fix": "eslint src --fix",
     "format": "prettier --write .",
@@ -136,6 +137,7 @@
     "@eslint/js": "^10.0.1",
     "@types/node": "^20",
     "@types/vscode": "^1.85.0",
+    "@vitest/coverage-v8": "^4.1.9",
     "@vscode/vsce": "^3.0.0",
     "esbuild": "^0.25.0",
     "eslint": "^10.5.0",
diff --git a/src/tree/webhookTreeProvider.ts b/src/tree/webhookTreeProvider.ts
index 325fd83..1b6e296 100644
--- a/src/tree/webhookTreeProvider.ts
+++ b/src/tree/webhookTreeProvider.ts
@@ -123,11 +123,12 @@ export class WebhookTreeProvider implements vscode.TreeDataProvider<Node> {
       list.push(delivery);
       groups.set(branch, list);
     }
-    const keys = [...groups.keys()].sort((a, b) => {
-      if (a === NO_BRANCH_GROUP) return 1;
-      if (b === NO_BRANCH_GROUP) return -1;
-      return a.localeCompare(b);
-    });
-    return keys.map((branch) => new BranchNode(hookId, branch, groups.get(branch) ?? []));
+    return [...groups.entries()]
+      .sort(([a], [b]) => {
+        if (a === NO_BRANCH_GROUP) return 1;
+        if (b === NO_BRANCH_GROUP) return -1;
+        return a.localeCompare(b);
+      })
+      .map(([branch, deliveries]) => new BranchNode(hookId, branch, deliveries));
   }
 }
diff --git a/tests/errors.test.ts b/tests/errors.test.ts
new file mode 100644
index 0000000..b2813c1
--- /dev/null
+++ b/tests/errors.test.ts
@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import { toMessage } from '../src/errors';
+
+describe('toMessage', () => {
+  it('returns the message of an Error instance', () => {
+    expect(toMessage(new Error('boom'))).toBe('boom');
+  });
+
+  it('returns a string value unchanged', () => {
+    expect(toMessage('plain failure')).toBe('plain failure');
+  });
+
+  it('JSON-stringifies any other thrown value', () => {
+    expect(toMessage({ code: 42 })).toBe('{"code":42}');
+    expect(toMessage(123)).toBe('123');
+  });
+});
diff --git a/tests/extension.test.ts b/tests/extension.test.ts
index c8f345b..9af6977 100644
--- a/tests/extension.test.ts
+++ b/tests/extension.test.ts
@@ -184,6 +184,113 @@ describe('activate', () => {
     expect(vscode.window.showWarningMessage).toHaveBeenCalled();
   });
 
+  it('shows delivery details in a webview panel', async () => {
+    repos.getWebhookDelivery.mockResolvedValue({
+      data: {
+        id: 10,
+        guid: 'g',
+        event: 'push',
+        action: null,
+        status: 'OK',
+        status_code: 200,
+        duration: 5,
+        redelivery: false,
+        delivered_at: 'x',
+        request: { headers: null, payload: null },
+        response: { headers: null, payload: null },
+      },
+    });
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.showDelivery')(deliveryNode);
+
+    expect(repos.getWebhookDelivery).toHaveBeenCalledWith({
+      owner: 'seiya-koji',
+      repo: 'demo',
+      hook_id: 7,
+      delivery_id: 10,
+    });
+    expect(vscode.window.createWebviewPanel).toHaveBeenCalled();
+  });
+
+  it('surfaces an error when loading delivery details fails', async () => {
+    repos.getWebhookDelivery.mockRejectedValue(new Error('nope'));
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.showDelivery')(deliveryNode);
+
+    expect(vscode.window.showErrorMessage).toHaveBeenCalled();
+  });
+
+  it('ignores showDelivery when no client is active', async () => {
+    execFile.mockImplementation((_c: string, _a: string[], _o: unknown, cb: ExecCb) =>
+      cb(new Error('not a git repository'), '')
+    );
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.showDelivery')(deliveryNode);
+
+    expect(repos.getWebhookDelivery).not.toHaveBeenCalled();
+  });
+
+  it('ignores redeliver when no client is active', async () => {
+    execFile.mockImplementation((_c: string, _a: string[], _o: unknown, cb: ExecCb) =>
+      cb(new Error('not a git repository'), '')
+    );
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.redeliver')(deliveryNode);
+
+    expect(vscode.window.showWarningMessage).not.toHaveBeenCalled();
+  });
+
+  it('surfaces an error when redelivery fails', async () => {
+    vi.mocked(vscode.window.showWarningMessage).mockResolvedValue(
+      'Redeliver' as unknown as vscode.MessageItem
+    );
+    repos.redeliverWebhookDelivery.mockRejectedValue(new Error('boom'));
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.redeliver')(deliveryNode);
+
+    expect(vscode.window.showErrorMessage).toHaveBeenCalled();
+  });
+
+  it('ignores openWebhookSettings when the node carries no webhook', async () => {
+    activate(makeContext());
+    await flush();
+
+    await handlerFor('githubWebhooks.openWebhookSettings')({} as unknown as WebhookNode);
+
+    expect(vscode.env.openExternal).not.toHaveBeenCalled();
+  });
+
+  it('surfaces an error when authentication fails during load', async () => {
+    vi.mocked(vscode.authentication.getSession).mockRejectedValue(new Error('auth denied'));
+    activate(makeContext());
+    await flush();
+    await flush();
+
+    expect(vscode.window.showErrorMessage).toHaveBeenCalled();
+  });
+
+  it('refreshes the tree when the refresh command runs', async () => {
+    activate(makeContext());
+    await flush();
+    const options = vi.mocked(vscode.window.createTreeView).mock.calls[0][1];
+    const provider = options.treeDataProvider as unknown as { refresh: () => void };
+    const spy = vi.spyOn(provider, 'refresh');
+
+    await handlerFor('githubWebhooks.refresh')();
+
+    expect(spy).toHaveBeenCalled();
+  });
+
   it('deactivate runs without throwing', () => {
     expect(() => deactivate()).not.toThrow();
   });
diff --git a/tests/github/repoResolver.test.ts b/tests/github/repoResolver.test.ts
index 00aa161..35f79f7 100644
--- a/tests/github/repoResolver.test.ts
+++ b/tests/github/repoResolver.test.ts
@@ -132,6 +132,18 @@ describe('resolveRepo', () => {
     expect(await resolveRepo()).toBeUndefined();
     expect(execFile).not.toHaveBeenCalled();
   });
+
+  it('returns undefined when workspaceFolders is undefined', async () => {
+    setFolders(undefined);
+    expect(await resolveRepo()).toBeUndefined();
+    expect(execFile).not.toHaveBeenCalled();
+  });
+
+  it('returns undefined when git succeeds but no remote parses to a GitHub repo', async () => {
+    setFolders(DEFAULT_FOLDERS);
+    gitReturns('origin\tsome-unparseable-remote (fetch)\n');
+    expect(await resolveRepo()).toBeUndefined();
+  });
 });
 
 describe('webhookSettingsUrl', () => {
diff --git a/tests/panel/deliveryPanel.test.ts b/tests/panel/deliveryPanel.test.ts
index 68f642f..23482c8 100644
--- a/tests/panel/deliveryPanel.test.ts
+++ b/tests/panel/deliveryPanel.test.ts
@@ -1,5 +1,11 @@
-import { describe, it, expect } from 'vitest';
-import { escapeHtml, formatPayload, renderHtml } from '../../src/panel/deliveryPanel';
+import { describe, it, expect, vi } from 'vitest';
+import * as vscode from 'vscode';
+import {
+  DeliveryPanel,
+  escapeHtml,
+  formatPayload,
+  renderHtml,
+} from '../../src/panel/deliveryPanel';
 import type { DeliveryDetail } from '../../src/github/webhookClient';
 
 describe('escapeHtml', () => {
@@ -67,4 +73,42 @@ describe('renderHtml', () => {
     );
     expect(html).not.toContain('Branch:');
   });
+
+  it('includes the action and redelivery flag in the metadata line', () => {
+    const html = renderHtml(detail({ action: 'opened', redelivery: true }));
+    expect(html).toContain('push.opened');
+    expect(html).toContain('redelivery');
+  });
+});
+
+describe('DeliveryPanel', () => {
+  it('creates a panel, reuses it on later shows, and recreates after disposal', () => {
+    let disposeCb: () => void = () => {};
+    const panel = {
+      title: '',
+      webview: { html: '' },
+      reveal: vi.fn(),
+      onDidDispose: vi.fn((cb: () => void) => {
+        disposeCb = cb;
+      }),
+      dispose: vi.fn(),
+    };
+    const create = vi.mocked(vscode.window.createWebviewPanel);
+    create.mockReturnValue(panel as unknown as ReturnType<typeof create>);
+    create.mockClear();
+
+    DeliveryPanel.show(detail({ id: 1 }));
+    expect(create).toHaveBeenCalledTimes(1);
+    expect(panel.title).toBe('Delivery #1');
+    expect(panel.webview.html).toContain('Webhook delivery #1');
+
+    DeliveryPanel.show(detail({ id: 2 }));
+    expect(create).toHaveBeenCalledTimes(1); // reused, not recreated
+    expect(panel.reveal).toHaveBeenCalledTimes(1);
+    expect(panel.webview.html).toContain('Webhook delivery #2');
+
+    disposeCb(); // clears the singleton
+    DeliveryPanel.show(detail({ id: 3 }));
+    expect(create).toHaveBeenCalledTimes(2);
+  });
 });
diff --git a/tests/tree/nodes.test.ts b/tests/tree/nodes.test.ts
index 6f8f928..00d7afa 100644
--- a/tests/tree/nodes.test.ts
+++ b/tests/tree/nodes.test.ts
@@ -73,6 +73,18 @@ describe('DeliveryNode', () => {
     expect(node.description).toContain('main');
     expect(node.tooltip).toContain('Branch: main');
   });
+
+  it('uses the error icon for a failed status and includes the action in the tooltip', () => {
+    const node = new DeliveryNode(7, {
+      ...delivery,
+      status_code: 500,
+      status: 'Internal Server Error',
+      action: 'opened',
+    });
+    expect((node.iconPath as { id: string }).id).toBe('error');
+    expect((node.iconPath as { color: { id: string } }).color.id).toBe('testing.iconFailed');
+    expect(node.tooltip).toContain('push.opened');
+  });
 });
 
 describe('BranchNode', () => {
diff --git a/tests/tree/webhookTreeProvider.test.ts b/tests/tree/webhookTreeProvider.test.ts
index a9ed772..b96a6f3 100644
--- a/tests/tree/webhookTreeProvider.test.ts
+++ b/tests/tree/webhookTreeProvider.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from 'vitest';
-import type * as vscode from 'vscode';
+import * as vscode from 'vscode';
 import { WebhookTreeProvider } from '../../src/tree/webhookTreeProvider';
 import { HostNode, WebhookNode, BranchNode, DeliveryNode, MessageNode } from '../../src/tree/nodes';
 import type { WebhookClient } from '../../src/github/webhookClient';
@@ -250,4 +250,99 @@ describe('WebhookTreeProvider', () => {
     expect(labels).toEqual(['(No branch)']); // all deliveries fall back to no-branch group
     warn.mockRestore();
   });
+
+  it('sorts branch groups alphabetically with the branchless group last', async () => {
+    const deliveries = [
+      summary(20, 'push', null),
+      summary(21, 'issues', 'opened'),
+      summary(22, 'push', null),
+      summary(23, 'pull_request', 'opened'),
+    ];
+    const payloads: Record<number, unknown> = {
+      20: { ref: 'refs/heads/zeta' },
+      21: { issue: { number: 1 } },
+      22: { ref: 'refs/heads/alpha' },
+      23: { pull_request: { base: { ref: 'mu' } } },
+    };
+    const client = {
+      listWebhooks: vi
+        .fn()
+        .mockResolvedValue([
+          { id: 1, name: 'web', active: true, events: ['push'], config: { url: 'https://h/hook' } },
+        ]),
+      listDeliveries: vi.fn().mockResolvedValue(deliveries),
+      getDelivery: vi
+        .fn()
+        .mockImplementation((_hookId: number, id: number) =>
+          Promise.resolve({ id, request: { payload: payloads[id] } })
+        ),
+    } as unknown as WebhookClient;
+    const provider = new WebhookTreeProvider(makeLog());
+    provider.setClient(client);
+
+    const webhookNode = await getWebhookNode(provider);
+    const branches = await provider.getChildren(webhookNode);
+
+    expect(branches.map((node) => node.label)).toEqual(['alpha', 'mu', 'zeta', '(No branch)']);
+  });
+
+  it('returns the element itself as its tree item', () => {
+    const provider = new WebhookTreeProvider(makeLog());
+    const node = new MessageNode('hello');
+    expect(provider.getTreeItem(node)).toBe(node);
+  });
+
+  it('groups a webhook whose config has no url under its name', async () => {
+    const provider = new WebhookTreeProvider(makeLog());
+    provider.setClient({
+      listWebhooks: vi
+        .fn()
+        .mockResolvedValue([
+          { id: 1, name: 'named-hook', active: true, events: ['push'], config: {} },
+        ]),
+      listDeliveries: vi.fn(),
+    } as unknown as WebhookClient);
+
+    const roots = await provider.getChildren();
+
+    expect(roots).toHaveLength(1);
+    expect(roots[0].label).toBe('named-hook');
+  });
+
+  it('returns no children for node types that never expand', async () => {
+    const provider = new WebhookTreeProvider(makeLog());
+    provider.setClient(createClient());
+
+    expect(await provider.getChildren(new MessageNode('leaf'))).toEqual([]);
+  });
+
+  it('reports an error and returns no children when listing webhooks fails', async () => {
+    const log = makeLog();
+    const provider = new WebhookTreeProvider(log);
+    provider.setClient({
+      listWebhooks: vi.fn().mockRejectedValue(new Error('api down')),
+      listDeliveries: vi.fn(),
+    } as unknown as WebhookClient);
+
+    const roots = await provider.getChildren();
+
+    expect(roots).toEqual([]);
+    expect(log.error).toHaveBeenCalled();
+    expect(vscode.window.showErrorMessage).toHaveBeenCalled();
+  });
+
+  it('returns an ungrouped delivery list when no cache is present', async () => {
+    const provider = new WebhookTreeProvider(makeLog());
+    const client = createBranchClient();
+    // White-box: bypass setClient so no DeliveryCache is created, exercising the
+    // ungrouped fallback in webhookChildren.
+    (provider as unknown as { client: WebhookClient }).client = client;
+
+    const webhookNode = await getWebhookNode(provider);
+    const children = await provider.getChildren(webhookNode);
+
+    expect(children.every((node) => node instanceof DeliveryNode)).toBe(true);
+    expect(children).toHaveLength(3);
+    expect(client.getDelivery).not.toHaveBeenCalled();
+  });
 });
diff --git a/vitest.config.ts b/vitest.config.ts
index 0058bc2..81809ba 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -11,5 +11,17 @@ export default defineConfig({
     globals: true,
     environment: 'node',
     include: ['tests/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'lcov'],
+      reportsDirectory: './coverage',
+      include: ['src/**/*.ts'],
+      thresholds: {
+        statements: 100,
+        branches: 100,
+        functions: 100,
+        lines: 100,
+      },
+    },
   },
 });