Add async_engine_from_config()

Added :func:`_asyncio.async_engine_config` function to create
an async engine from a configuration dict.  This otherwise
behaves the same as :func:`_sa.engine_from_config`.

Fixes: #7301
Closes: #7302
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/7302
Pull-request-sha: c7c758833b6c37b7509b8c5bed4f26ac0ccc0395

Change-Id: I64feadf95b5015c24fe0fa0dbae6755b72d1713e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ext/asyncio/test_engine_py3k.py b/test/ext/asyncio/test_engine_py3k.py
index c65a51bf7..7e680bd0e 100644
--- a/test/ext/asyncio/test_engine_py3k.py
+++ b/test/ext/asyncio/test_engine_py3k.py
@@ -14,6 +14,7 @@ from sqlalchemy import Table
 from sqlalchemy import testing
 from sqlalchemy import text
 from sqlalchemy import union_all
+from sqlalchemy.ext.asyncio import async_engine_from_config
 from sqlalchemy.ext.asyncio import create_async_engine
 from sqlalchemy.ext.asyncio import engine as _async_engine
 from sqlalchemy.ext.asyncio import exc as asyncio_exc
@@ -588,6 +589,16 @@ class AsyncEngineTest(EngineFixture):
             server_side_cursors=True,
         )
 
+    def test_async_engine_from_config(self):
+        config = {
+            "sqlalchemy.url": str(testing.db.url),
+            "sqlalchemy.echo": "true",
+        }
+        engine = async_engine_from_config(config)
+        assert engine.url == testing.db.url
+        assert engine.echo is True
+        assert engine.dialect.is_async is True
+
 
 class AsyncEventTest(EngineFixture):
     """The engine events all run in their normal synchronous context.