diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
new file mode 100644
index 0000000..e36bf58
--- /dev/null
+++ b/.github/workflows/unittest.yml
@@ -0,0 +1,54 @@
+name: Unit Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.3"
+          extensions: brotli zstd zlib
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: |
+            composer install --prefer-dist
+            sudo apt-get install brotli zstd gzip -y
+
+      - name: Start the server
+        working-directory: tests
+        run: nohup php -S localhost:8000
+
+      - name: Test gzip
+        run: |
+            output=$(curl localhost:8000 -s -H "Accept-Encoding: gzip" | gzip -d -)
+            echo "$output"
+
+      - name: Test brotli
+        run: |
+            output=$(curl localhost:8000 -s -H "Accept-Encoding: br" | brotli -d -)
+            echo "$output"
+
+      - name: Test zstd
+        run: |
+            output=$(curl localhost:8000 -s -H "Accept-Encoding: zstd" | zstd -d -)
+            echo "$output"
diff --git a/index.php b/tests/index.php
similarity index 65%
rename from index.php
rename to tests/index.php
index e37d255..5fd7035 100644
--- a/index.php
+++ b/tests/index.php
@@ -2,11 +2,11 @@
 
 use HostByBelle\CompressionBuffer;
 
-require 'vendor/autoload.php';
+require dirname(__DIR__) . '/vendor/autoload.php';
 
 CompressionBuffer::setUp();
 ob_start([CompressionBuffer::class, 'handler']);
 
-echo "If you can read this, it works!";
+echo "Hello, world!";
 
 ob_end_flush();