temporarily exclude pytest-asyncio 1.0.0

Author: parthea

noxfile.py

@@ -392,7 +392,9 @@ def showcase(
     """Run the Showcase test suite."""
 
     with showcase_library(session, templates=templates, other_opts=other_opts):
-        session.install("pytest", "pytest-asyncio")
+        # Exclude pytest-asyncio==1.0.0 while we investigate the recent failure described in
+        # https://github.com/googleapis/gapic-generator-python/issues/2399
+        session.install("pytest", "pytest-asyncio!=1.0.0")
         test_directory = Path("tests", "system")
         ignore_file = env.get("IGNORE_FILE")
         pytest_command = [