add aio module for async I/O support

Author: chrissimpkins

lib/fdiff/aio.py

@@ -0,0 +1,7 @@
+import aiofiles
+
+
+async def async_write_bin(path, binary):
+    """Asynchronous IO writes of binary data `binary` to disk on the file path `path`"""
+    async with aiofiles.open(path, "wb") as f:
+        await f.write(binary)

tests/test_aio.py

@@ -0,0 +1,17 @@
+import os
+import tempfile
+
+import pytest
+
+from fdiff.aio import async_write_bin
+
+
+@pytest.mark.asyncio
+async def test_async_write():
+    with tempfile.TemporaryDirectory() as tmpdirname:
+        test_path = os.path.join(tmpdirname, "test.bin")
+        await async_write_bin(test_path, b"test")
+        assert os.path.exists(test_path) is True
+        with open(test_path, "rb") as f:
+            res = f.read()
+            assert res == b"test"