diff --git a/testr.py b/testr.py
index 530dbfd..695342f 100644
--- a/testr.py
+++ b/testr.py
@@ -1,7 +1,24 @@
+import asyncio
+from pathlib import Path
+from testr.file_data import DirectorySuite, ExecutableRunner
 import argparse
 
 parser = argparse.ArgumentParser()
-parser.add_argument("tests_dir", help="Directory for test cases")
-parser.add_argument("executable", help="Executable to run test cases against")
 
-parser.parse_args()
+test_runner_group = parser.add_mutually_exclusive_group(required=True)
+test_data_group = parser.add_mutually_exclusive_group(required=True)
+
+test_data_group.add_argument("--testdir", help="Directory for test cases")
+test_runner_group.add_argument("--exec", help="Executable to run test cases against")
+
+args = parser.parse_args()
+
+async def main():
+    test_suite = DirectorySuite(Path(args.testdir))
+    test_runner = ExecutableRunner(Path(args.exec))
+
+    async for test_case in test_runner.run_test_suite(test_suite):
+        print(test_case.code)
+
+if __name__ == "__main__":
+    asyncio.run(main())