fix: ensure Coverage report is combined together (aws#297)

Run coverage in Append mode, so that we build a full coverage report for codecov

fixes: aws#296

Author: antdking

tox.ini

@@ -53,11 +53,12 @@ deps =
     py{35,36,37,38,39}: aiobotocore >= 0.10.0
 
 commands =
-    py{27,34}-default: coverage run --source aws_xray_sdk -m py.test tests --ignore tests/ext/aiohttp --ignore tests/ext/aiobotocore --ignore tests/ext/django --ignore tests/test_async_local_storage.py --ignore tests/test_async_recorder.py --ignore tests/ext/sqlalchemy_core
-    py{35,36,37,38,39}-default: coverage run --source aws_xray_sdk -m py.test tests --ignore tests/ext/django --ignore tests/ext/sqlalchemy_core
-    py{27,36,37,38,39}-default: coverage run --source aws_xray_sdk -m py.test tests/ext/sqlalchemy_core
-    py{34,35}-default: coverage run --source aws_xray_sdk -m py.test tests/ext/sqlalchemy_core/ --ignore tests/ext/sqlalchemy_core/test_sqlalchemy_core_2.py
-    django{22,30,31,32}: coverage run --source aws_xray_sdk -m py.test tests/ext/django
+    coverage erase
+    py{27,34}-default: coverage run --append --source aws_xray_sdk -m py.test tests --ignore tests/ext/aiohttp --ignore tests/ext/aiobotocore --ignore tests/ext/django --ignore tests/test_async_local_storage.py --ignore tests/test_async_recorder.py --ignore tests/ext/sqlalchemy_core
+    py{35,36,37,38,39}-default: coverage run --append --source aws_xray_sdk -m py.test tests --ignore tests/ext/django --ignore tests/ext/sqlalchemy_core
+    py{27,36,37,38,39}-default: coverage run --append --source aws_xray_sdk -m py.test tests/ext/sqlalchemy_core
+    py{34,35}-default: coverage run --append --source aws_xray_sdk -m py.test tests/ext/sqlalchemy_core/ --ignore tests/ext/sqlalchemy_core/test_sqlalchemy_core_2.py
+    django{22,30,31,32}: coverage run --append --source aws_xray_sdk -m py.test tests/ext/django
     codecov
 
 setenv =