Try to add codecov.

.github/workflows/ci.yml

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+name: Codecov
+on:
+  push:
+    branches: [ "*" ]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests and generate coverage
+        run: npm run test -- --coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}  # Required if the repo is private
+          files: ./coverage/lcov.info           # Path to the lcov report
+          flags: unittests                      # Optional: Flag for specific test type
+          name: codecov-umbrella                # Optional: Custom name for coverage report
+          fail_ci_if_error: true                # Optional: Fail CI if upload fails

package.json

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+{
+  "devDependencies": {
+    "@vitest/coverage-v8": "^2.1.4",
+    "vitest": "^2.1.4"
+  },
+  "scripts": {
+    "test": "vitest"
+  }
+}

tests/sample.test.ts

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+import { describe, it, expect } from 'vitest';
+
+describe('Sample Test', () => {
+    it('should pass', () => {
+        expect(true).toBe(true);
+    });
+});

vite.config.ts

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+import { defineConfig } from 'vite';
+import { configDefaults } from 'vitest/config';
+
+export default defineConfig({
+    test: {
+        include: ['tests/**/*.test.ts'], // Adjust this to your test file location
+        coverage: {
+            provider: 'v8',
+            reporter: ['text', 'json', 'lcov'],
+            reportsDirectory: './coverage',
+        },
+    },
+});