diff --git a/tests/integration-data/1.txt b/tests/integration-data/1.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/integration-data/1.txt
@@ -0,0 +1 @@
+1
diff --git a/tests/integration.py b/tests/integration.py
new file mode 100644
index 0000000..ed14812
--- /dev/null
+++ b/tests/integration.py
@@ -0,0 +1,81 @@
+import functools
+import http.server
+import pathlib
+import tempfile
+import threading
+import unittest
+import shutil
+import subprocess
+
+ROOT = pathlib.Path(__file__).parent.absolute()
+
+WCURL_PATH = ROOT / '..' / 'wcurl'
+DATA_PATH = ROOT / 'integration-data'
+
+
+class TestWcurl(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        handler = functools.partial(
+            http.server.SimpleHTTPRequestHandler,
+            directory=DATA_PATH,
+        )
+
+        cls.server_addr = '127.0.0.1'
+        cls.server_port = 9080
+
+        cls._server = http.server.ThreadingHTTPServer(
+            (cls.server_addr, cls.server_port),
+            handler
+        )
+
+        def run_server():
+            cls._server.serve_forever()
+
+        cls._server_thread = threading.Thread(target=run_server)
+        cls._server_thread.start()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls._server.shutdown()
+        cls._server_thread.join(timeout=1)
+
+        if cls._server_thread.is_alive():
+            raise RuntimeException('Server thread timed out')
+
+    def setUp(self):
+        self.dir = tempfile.mkdtemp(prefix='wcurl_')
+        self.path = pathlib.Path(self.dir)
+        print(f'Using temporary directory: {self.dir}')
+
+    def url_for(self, path):
+        return f'http://{self.server_addr}:{self.server_port}/{path}'
+
+    def exec_wcurl(self, *options, check=True):
+        result = subprocess.run(
+            args=[WCURL_PATH, *options],
+            cwd=self.dir,
+            capture_output=True,
+            check=check,
+        )
+
+        return result
+
+    def test_single_url(self):
+        result = self.exec_wcurl(self.url_for('1.txt'))
+        files = sorted(p.name for p in self.path.glob('*'))
+        self.assertEqual(files, ['1.txt'])
+
+    def test_repeated_url(self):
+        url = self.url_for('1.txt')
+        result = self.exec_wcurl(url, url)
+        files = sorted(p.name for p in self.path.glob('*'))
+        self.assertEqual(files, ['1.txt', '1.txt.1'])
+
+    def test_fail_exits_with_error(self):
+        url = self.url_for('does-not-exist')
+        with self.assertRaises(subprocess.CalledProcessError):
+            self.exec_wcurl(url)
+
+if __name__ == '__main__':
+    unittest.main()