diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..867cd4d
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,32 @@
+name: Run unit tests
+
+on:
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
+          - "3.13"
+          - "3.14"
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Run unit tests
+        run: |
+          python -m unittest discover -s test -v
diff --git a/pysteamsignin/steamsignin.py b/pysteamsignin/steamsignin.py
index a8bbb7b..e6e02b4 100644
--- a/pysteamsignin/steamsignin.py
+++ b/pysteamsignin/steamsignin.py
@@ -131,9 +131,13 @@ def ValidateResults(self, results):
         parsedArgs = urlencode(validationArgs).encode("utf-8")
         logger.info('Encoded the validation arguments, prepped to send.')
 
-        with urllib.request.urlopen(self._provider, parsedArgs, timeout = OPENID_TIMEOUT) as requestData:
-            responseData = requestData.read().decode('utf-8')
-            logger.info(f"Sent request to {self._provider}, got back a response.")
+        try:
+            with urllib.request.urlopen(self._provider, parsedArgs, timeout = OPENID_TIMEOUT) as requestData:
+                responseData = requestData.read().decode("utf-8")
+                logger.info(f"Sent request to {self._provider}, got back a response.")
+        except Exception as e:
+            logger.warning(f"Steam OpenID verification failed: {e}")
+            return False
 
         fields = {}
 
diff --git a/setup.py b/setup.py
index b86008a..1da7f6f 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="steamsignin",
-    version="1.1.2",
+    version="1.1.3",
     author="TeddiO",
     author_email="",
     description="OpenID 2.0 sign in for Steam",
@@ -20,6 +20,6 @@
         "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
         "Operating System :: OS Independent",
     ],
-    packages=setuptools.find_packages(exclude=('samples')),
+    packages=setuptools.find_packages(exclude=('samples', '.github')),
     python_requires=">=3.6"
 )
\ No newline at end of file
diff --git a/test/tests.py b/test/tests.py
new file mode 100644
index 0000000..a2b6f1a
--- /dev/null
+++ b/test/tests.py
@@ -0,0 +1,93 @@
+import unittest
+import sys
+import os
+import logging
+from unittest.mock import patch
+import urllib.error
+import socket
+
+sys.path.append(os.path.join(os.path.dirname(os.path.dirname(__file__))))
+from pysteamsignin.steamsignin import SteamSignIn
+
+
+def valid_results():
+    steam_id = "12345678901234567"
+    claimed = f"https://steamcommunity.com/openid/id/{steam_id}"
+
+    return {
+        "openid.assoc_handle": "assoc",
+        "openid.signed": "claimed_id,identity",
+        "openid.sig": "sig",
+        "openid.ns": "http://specs.openid.net/auth/2.0",
+        "openid.claimed_id": claimed,
+        "openid.identity": claimed,
+    }
+
+
+class FakeSteamResponse:
+    def __init__(self, body):
+        self._body = body.encode("utf-8")
+
+    def read(self):
+        return self._body
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc, tb):
+        pass
+
+
+class TestSteamSignIn(unittest.TestCase):
+
+    @patch("urllib.request.urlopen")
+    def test_valid_openid_response_returns_steamid_string(self, mock_urlopen):
+        mock_urlopen.return_value = FakeSteamResponse("is_valid:true\n")
+
+        signin = SteamSignIn()
+        result = signin.ValidateResults(valid_results())
+
+        self.assertEqual(result, "12345678901234567")
+
+    @patch("urllib.request.urlopen")
+    def test_steam_is_valid_false_denies_login(self, mock_urlopen):
+        mock_urlopen.return_value = FakeSteamResponse("is_valid:false\n")
+
+        signin = SteamSignIn()
+        result = signin.ValidateResults(valid_results())
+
+        self.assertFalse(result)
+
+    @patch("urllib.request.urlopen", side_effect = socket.timeout("timed out"))
+    def test_openid_timeout_fails_closed_and_logs_warning(self, mock_urlopen):
+        with self.assertLogs("pysteamsignin.steamsignin", level = logging.WARNING) as logs:
+            signin = SteamSignIn()
+            result = signin.ValidateResults(valid_results())
+
+        self.assertFalse(result)
+        self.assertIn("Steam OpenID verification failed", logs.output[0])
+
+    @patch("urllib.request.urlopen", side_effect = urllib.error.URLError("connection failed"))
+    def test_network_error_fails_closed_and_logs_warning(self, mock_urlopen):
+        with self.assertLogs("pysteamsignin.steamsignin", level = logging.WARNING) as logs:
+            signin = SteamSignIn()
+            result = signin.ValidateResults(valid_results())
+
+        self.assertFalse(result)
+        self.assertIn("Steam OpenID verification failed", logs.output[0])
+
+    @patch("urllib.request.urlopen")
+    def test_claimed_id_identity_mismatch_fails_validation(self, mock_urlopen):
+        mock_urlopen.return_value = FakeSteamResponse("is_valid:true\n")
+
+        results = valid_results()
+        results["openid.identity"] = "https://steamcommunity.com/openid/id/DIFFERENT"
+
+        signin = SteamSignIn()
+        result = signin.ValidateResults(results)
+
+        self.assertFalse(result)
+
+
+if __name__ == "__main__":
+    unittest.main()