diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..e1a5dfb
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,32 @@
+name: test
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install Dependencies
+        run: npm ci
+      
+      - name: Build Registry
+        run: npm run build
+
+      - name: Run Test
+        env:
+          R2_HOSTNAME: ${{ secrets.TEST_R2_HOSTNAME }}
+          S3_ACCESS_KEY_ID: ${{ secrets.TEST_S3_ACCESS_KEY_ID }}
+          S3_BUCKET: ${{ secrets.TEST_S3_BUCKET }}
+          S3_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
+          S3_SECRET_ACCESS_KEY: ${{ secrets.TEST_S3_SECRET_ACCESS_KEY }}
+        run: npm test
diff --git a/package.json b/package.json
index 5b2db4a..be573d3 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,10 @@
   "scripts": {
     "dev": "astro dev",
     "start": "node build/index.cjs",
-    "build": "astro build && esbuild registry/index.ts --bundle --format=cjs --loader:.html=text --loader:.svg=text --external:esbuild --platform=node --outfile=build/index.cjs"
+    "build": "astro build && esbuild registry/index.ts --bundle --format=cjs --loader:.html=text --loader:.svg=text --external:esbuild --platform=node --outfile=build/index.cjs",
+    "pretest": "node build/index.cjs &",
+    "test": "node --test",
+    "posttest": "kill $(lsof -t -i:3000)"
   },
   "dependencies": {
     "@aws-sdk/client-s3": "^3.540.0",
diff --git a/test/registry.test.js b/test/registry.test.js
new file mode 100644
index 0000000..2cbf3c0
--- /dev/null
+++ b/test/registry.test.js
@@ -0,0 +1,67 @@
+import assert from 'node:assert'
+import test from 'node:test'
+
+async function fetchStr(url) {
+  const res = await fetch(url)
+
+  if (!res.ok) {
+    await res.body.cancel()
+
+    return null
+  }
+
+  return await res.text()
+}
+
+async function fetchJson(url) {
+  const res = await fetch(url)
+
+  if (!res.ok) {
+    await res.body.cancel()
+
+    return null
+  }
+
+  return await res.json()
+}
+
+test('latest tag', async () => {
+  const latestTag = (await fetchJson('https://api.github.com/repos/esbuild/deno-esbuild/tags'))[0].name
+
+  const res = await fetch('http://localhost:3000/esbuild/deno-esbuild/mod.js', {
+    redirect: 'manual'
+  })
+
+  await res.body.cancel()
+
+  assert.strictEqual(res.headers.get('location', `https://deno.re/esbuild/deno-esbuild@${latestTag}/mod.js`), expected)
+})
+
+test('specific commit', async () => {
+  const actual = await fetchStr('http://localhost:3000/esbuild/deno-esbuild@d4ebc0f33d39d5b8cc94eec4b1a94ce5b388cd6f/mod.js')
+  const expected = await fetchStr('https://raw.githubusercontent.com/esbuild/deno-esbuild/d4ebc0f33d39d5b8cc94eec4b1a94ce5b388cd6f/mod.js')
+
+  assert.strictEqual(actual, expected)
+})
+
+test('specific tag', async () => {
+  const actual = await fetchStr('http://localhost:3000/esbuild/deno-esbuild@v0.19.0/mod.js')
+  const expected = await fetchStr('https://raw.githubusercontent.com/esbuild/deno-esbuild/v0.19.0/mod.js')
+
+  assert.strictEqual(actual, expected)
+})
+
+test('omit entry point', async () => {
+  const actual = await fetchStr('http://localhost:3000/esbuild/deno-esbuild@v0.20.0')
+  const expected = await fetchStr('https://raw.githubusercontent.com/esbuild/deno-esbuild/v0.20.0/mod.js')
+
+  assert.strictEqual(actual, expected)
+})
+
+test('type header', async () => {
+  const res = await fetch('http://localhost:3000/esbuild/deno-esbuild@v0.20.0/mod.js')
+
+  await res.body.cancel()
+
+  assert.strictEqual(res.headers.get('x-typescript-types'), `https://deno.re/esbuild/deno-esbuild@v0.20.0/mod.d.ts`)
+})