diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..d85e73ef
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,23 @@
+name: Pull Request Check
+
+on:
+  pull_request:
+    branches:
+      - main 
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Validate code
+      uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+    - name: Install the latest version of uv
+      uses: astral-sh/setup-uv@v3
+      with:
+        version: "latest"
+    - name: Run test script
+      run: uv run test/run_test.py
\ No newline at end of file
diff --git a/helloworld.py b/helloworld.py
index 59701dbe..b5d1f20e 100755
--- a/helloworld.py
+++ b/helloworld.py
@@ -6,4 +6,4 @@
 import helloworld.main
 
 if __name__ == '__main__':
-    sys.exit(helloworld.main.main())
+    sys.exit(helloworld.main.main())
\ No newline at end of file
diff --git a/helloworld/main.py b/helloworld/main.py
index 10567a62..5d6f071b 100644
--- a/helloworld/main.py
+++ b/helloworld/main.py
@@ -21,6 +21,6 @@ def main(argv=None):
     # ensures the user hasn't passed any other unrecognized arguments.
     parser.parse_args(argv[1:])
 
-    print("Hello, world")
+    return "Hello, world2"
 
-    return 0
+#     return 0
diff --git a/test/run_test.py b/test/run_test.py
new file mode 100644
index 00000000..abfca175
--- /dev/null
+++ b/test/run_test.py
@@ -0,0 +1,5 @@
+import helloworld.main
+
+# print(helloworld.main.main())
+
+assert  helloworld.main.main() == 'Hello, world'
\ No newline at end of file