Replace asyncio.async() by asyncio.ensure_future() in tests. Ref #2566.

tests/utils/test_asyncio.py

@@ -31,7 +31,7 @@ def test_wait_run_in_executor(loop):
         return param
 
     exec = wait_run_in_executor(change_var, "test")
-    result = loop.run_until_complete(asyncio.async(exec))
+    result = loop.run_until_complete(asyncio.ensure_future(exec))
     assert result == "test"
 
 
@@ -42,7 +42,7 @@ def test_exception_wait_run_in_executor(loop):
 
     exec = wait_run_in_executor(raise_exception)
     with pytest.raises(Exception):
-        result = loop.run_until_complete(asyncio.async(exec))
+        result = loop.run_until_complete(asyncio.ensure_future(exec))
 
 
 @pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
@@ -52,7 +52,7 @@ def test_subprocess_check_output(loop, tmpdir, restore_original_path):
     with open(path, "w+") as f:
         f.write("TEST")
     exec = subprocess_check_output("cat", path)
-    result = loop.run_until_complete(asyncio.async(exec))
+    result = loop.run_until_complete(asyncio.ensure_future(exec))
     assert result == "TEST"
 
 
@@ -64,13 +64,13 @@ def test_wait_for_process_termination(loop):
     process = MagicMock()
     process.returncode = 0
     exec = wait_for_process_termination(process)
-    loop.run_until_complete(asyncio.async(exec))
+    loop.run_until_complete(asyncio.ensure_future(exec))
 
     process = MagicMock()
     process.returncode = None
     exec = wait_for_process_termination(process, timeout=0.5)
     with pytest.raises(asyncio.TimeoutError):
-        loop.run_until_complete(asyncio.async(exec))
+        loop.run_until_complete(asyncio.ensure_future(exec))
 
 
 def test_lock_decorator(loop):