bpo-39915: Ensure await_args_list is updated according to the order in which coroutines were awaited (GH-18927)

Create call objects with awaited arguments instead of using call_args which has only last call value.
(cherry picked from commit e553f204bf0e39b1d701a364bc71b286acb9433f)

Co-authored-by: Karthikeyan Singaravelan <tir.karthi@gmail.com>

3 files changed, 16 insertions, 1 deletions

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 204b3e7..a8f74a9 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -2136,7 +2136,7 @@ class AsyncMockMixin(Base):
         # This is nearly just like super(), except for sepcial handling
         # of coroutines
 
-        _call = self.call_args
+        _call = _Call((args, kwargs), two=True)
         self.await_count += 1
         self.await_args = _call
         self.await_args_list.append(_call)
diff --git a/Lib/unittest/test/testmock/testasync.py b/Lib/unittest/test/testmock/testasync.py
index e68022a..e84c66c 100644
--- a/Lib/unittest/test/testmock/testasync.py
+++ b/Lib/unittest/test/testmock/testasync.py
@@ -496,6 +496,17 @@ class AsyncArguments(unittest.IsolatedAsyncioTestCase):
         mock.assert_awaited()
         self.assertTrue(ran)
 
+    async def test_await_args_list_order(self):
+        async_mock = AsyncMock()
+        mock2 = async_mock(2)
+        mock1 = async_mock(1)
+        await mock1
+        await mock2
+        async_mock.assert_has_awaits([call(1), call(2)])
+        self.assertEqual(async_mock.await_args_list, [call(1), call(2)])
+        self.assertEqual(async_mock.call_args_list, [call(2), call(1)])
+
+
 class AsyncMagicMethods(unittest.TestCase):
     def test_async_magic_methods_return_async_mocks(self):
         m_mock = MagicMock()
diff --git a/Misc/NEWS.d/next/Library/2020-03-10-19-38-47.bpo-39915.CjPeiY.rst b/Misc/NEWS.d/next/Library/2020-03-10-19-38-47.bpo-39915.CjPeiY.rst
new file mode 100644
index 0000000..2c36947
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-03-10-19-38-47.bpo-39915.CjPeiY.rst
@@ -0,0 +1,4 @@
+Ensure :attr:`unittest.mock.AsyncMock.await_args_list` has call objects in
+the order of awaited arguments instead of using
+:attr:`unittest.mock.Mock.call_args` which has the last value of the call.
+Patch by Karthikeyan Singaravelan.