configure pytest to be stricter (#1040)

* fix tests/test_datastructures::TestUploadFile PytestCollectionWarning

enhance pytest strictness to catch warnings that would have prevented
thest TestUploadFile file warning

restore cov-report and require 100% coverage

* Apply suggestions from code review

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

* remove cov-fail-under

* Apply suggestions from code review

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

* Apply suggestions from code review

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

* Update setup.cfg

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

setup.cfg

@@ -16,4 +16,20 @@ profile = black
 combine_as_imports = True
 
 [tool:pytest]
-addopts = --cov-report= --cov=starlette --cov=tests -rxXs
+addopts =
+  --cov-report=term-missing:skip-covered
+  --cov=starlette
+  --cov=tests
+  -rxXs
+  --strict-config
+  --strict-markers
+xfail_strict=True
+filterwarnings=
+    # Turn warnings that aren't filtered into exceptions
+    error
+    # https://github.com/Tinche/aiofiles/issues/81
+    ignore: "@coroutine" decorator is deprecated.*:DeprecationWarning
+    # https://github.com/graphql-python/graphene/issues/1055
+    ignore: Using or importing the ABCs from 'collections' instead of from 'collections\.abc' is deprecated.*:DeprecationWarning
+    ignore: The 'context' alias has been deprecated. Please use 'context_value' instead\.:DeprecationWarning
+    ignore: The 'variables' alias has been deprecated. Please use 'variable_values' instead\.:DeprecationWarning

tests/test_datastructures.py

@@ -213,13 +213,13 @@ def test_queryparams():
     assert QueryParams(q) == q
 
 
-class TestUploadFile(UploadFile):
+class BigUploadFile(UploadFile):
     spool_max_size = 1024
 
 
 @pytest.mark.asyncio
 async def test_upload_file():
-    big_file = TestUploadFile("big-file")
+    big_file = BigUploadFile("big-file")
     await big_file.write(b"big-data" * 512)
     await big_file.write(b"big-data")
     await big_file.seek(0)