prepare tests and disable warnings for asyncio unittest cases

shoehorn unittest async results into python test result interpretation

changelog

testing/example_scripts/unittest/test_unittest_asyncio.py

@@ -0,0 +1,15 @@
+from unittest import IsolatedAsyncioTestCase  # type: ignore
+
+
+class AsyncArguments(IsolatedAsyncioTestCase):
+    async def test_something_async(self):
+        async def addition(x, y):
+            return x + y
+
+        self.assertEqual(await addition(2, 2), 4)
+
+    async def test_something_async_fails(self):
+        async def addition(x, y):
+            return x + y
+
+        self.assertEqual(await addition(2, 2), 3)