diff --git a/tests/test_cache.py b/tests/test_cache.py
new file mode 100644
index 0000000..17ecf81
--- /dev/null
+++ b/tests/test_cache.py
@@ -0,0 +1,12 @@
+# MIT licensed
+# Copyright (c) 2018 lilydjwg <lilydjwg@gmail.com>, et al.
+
+import pytest
+pytestmark = pytest.mark.asyncio
+
+async def test_cache(get_version):
+  a = await get_version("a", {"cmd": "date +%%Y-%%m-%%d"})
+  b = await get_version("b", {"cmd": "date +%%Y-%%m-%%d"})
+  c = await get_version("c", {"cmd": "date"})
+  assert a == b
+  assert a != c