diff --git a/.azure-pipelines/ci.yml b/.azure-pipelines/ci.yml
index c0c6e7b4f99..60b6f456607 100644
--- a/.azure-pipelines/ci.yml
+++ b/.azure-pipelines/ci.yml
@@ -4,13 +4,15 @@ trigger:
     include:
     - master
     - ?.?*  # matches to backport branches, e.g. 3.6
+  tags:
     exclude:
-    - refs/tags/*
+    - '*'
 pr:
   autoCancel: true
   branches:
     include:
     - master
+    - ?.?*  # matches to backport branches, e.g. 3.6
 
 variables:
 - group: codecov
diff --git a/.azure-pipelines/stage-test.yml b/.azure-pipelines/stage-test.yml
index 0bbab56a813..5bf06df19d7 100644
--- a/.azure-pipelines/stage-test.yml
+++ b/.azure-pipelines/stage-test.yml
@@ -77,9 +77,12 @@ stages:
 
     - script: |
         pytest tests -vv
-        python -m coverage xml
       displayName: 'pytest'
 
+    - script: |
+        python -m coverage xml
+      displayName: 'Prepare coverage'
+
     - script: |
         pip install codecov
         python -m codecov -f coverage.xml -X gcov
diff --git a/tests/test_client_functional.py b/tests/test_client_functional.py
index 60217ab4107..6753a6d45d5 100644
--- a/tests/test_client_functional.py
+++ b/tests/test_client_functional.py
@@ -601,9 +601,9 @@ async def test_read_timeout_between_chunks(aiohttp_client, mocker) -> None:
     async def handler(request):
         resp = aiohttp.web.StreamResponse()
         await resp.prepare(request)
-        # write data 4 times, with pauses. Total time 0.4 seconds.
+        # write data 4 times, with pauses. Total time 2 seconds.
         for _ in range(4):
-            await asyncio.sleep(0.1)
+            await asyncio.sleep(0.5)
             await resp.write(b'data\n')
         return resp
 
@@ -611,7 +611,7 @@ async def handler(request):
     app.add_routes([web.get('/', handler)])
 
     # A timeout of 0.2 seconds should apply per read.
-    timeout = aiohttp.ClientTimeout(sock_read=0.2)
+    timeout = aiohttp.ClientTimeout(sock_read=1)
     client = await aiohttp_client(app, timeout=timeout)
 
     res = b''
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index ca6059cb539..a6f96f38fca 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -203,7 +203,7 @@ class TestPyReify(ReifyMixin):
     reify = helpers.reify_py
 
 
-if not helpers.NO_EXTENSIONS and not IS_PYPY:
+if not helpers.NO_EXTENSIONS and not IS_PYPY and hasattr(helpers, 'reify_c'):
     class TestCReify(ReifyMixin):
         reify = helpers.reify_c