Merge "Do not assume that greenlet is installed" into main

alembic/testing/requirements.py

@@ -95,6 +95,18 @@ def sqlalchemy_2(self):
             "SQLAlchemy 2.x test",
         )
 
+    @property
+    def asyncio(self):
+        def go(config):
+            try:
+                import greenlet  # noqa: F401
+            except ImportError:
+                return False
+            else:
+                return True
+
+        return self.sqlalchemy_14 + exclusions.only_if(go)
+
     @property
     def comments(self):
         return exclusions.only_if(

tests/test_op.py

@@ -1267,7 +1267,7 @@ async def go(conn):
         ):
             op.run_async(go)
 
-    @config.requirements.sqlalchemy_14
+    @config.requirements.asyncio
     def test_run_async_ok(self):
         from sqlalchemy.ext.asyncio import AsyncConnection
 

tox.ini

@@ -24,7 +24,8 @@ deps=pytest>4.6
      mako
      python-dateutil
      zimports
-     black==22.3.0
+     black==23.3.0
+     greenlet>=1