add xfailing test case for aio-libs#635

tests/test_sscursor.py

@@ -1,7 +1,7 @@
 import asyncio
 
 import pytest
-from pymysql import NotSupportedError
+from pymysql import NotSupportedError, InternalError
 
 from aiomysql import ProgrammingError, InterfaceError
 from aiomysql.cursors import SSCursor
@@ -188,3 +188,19 @@ async def read_cursor():
 
     with pytest.raises(InterfaceError):
         await conn.cursor(SSCursor)
+
+
+@pytest.mark.xfail(
+    reason="https://github.com/aio-libs/aiomysql/issues/635",
+    raises=InternalError,
+    strict=True,
+)
+@pytest.mark.run_loop
+async def test_sscursor_scroll_absolute(connection):
+    conn = connection
+    await _prepare(conn)
+    async with conn.cursor(SSCursor) as cursor:
+        await cursor.execute("select 1")
+        await cursor.execute("select 2")
+        ret = await cursor.fetchone()
+    assert (1,) == ret