build: treat warnings as errors (#564)

* build: treat warnings as errors

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* lint

* add pytest.ini

* add line break

* filter warning which appears only in python 3.7

* filter deprecation warning for grpcio-gcp

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

pytest.ini

@@ -0,0 +1,21 @@
+[pytest]
+filterwarnings =
+    # treat all warnings as errors
+    error
+    # Remove once https://github.com/pytest-dev/pytest-cov/issues/621 is fixed
+    ignore:.*The --rsyncdir command line argument and rsyncdirs config variable are deprecated:DeprecationWarning
+    # Remove once https://github.com/protocolbuffers/protobuf/issues/12186 is fixed
+    ignore:.*custom tp_new.*in Python 3.14:DeprecationWarning
+    # Remove once support for python 3.7 is dropped
+    # This warning only appears when using python 3.7
+    ignore:.*Using or importing the ABCs from.*collections:DeprecationWarning
+    # Remove once support for grpcio-gcp is deprecated
+    # See https://github.com/googleapis/python-api-core/blob/42e8b6e6f426cab749b34906529e8aaf3f133d75/google/api_core/grpc_helpers.py#L39-L45
+    ignore:.*Support for grpcio-gcp is deprecated:DeprecationWarning
+    # Remove once https://github.com/googleapis/python-api-common-protos/pull/187/files is merged
+    ignore:.*pkg_resources.declare_namespace:DeprecationWarning
+    ignore:.*pkg_resources is deprecated as an API:DeprecationWarning
+    # Remove once release PR https://github.com/googleapis/proto-plus-python/pull/391 is merged
+    ignore:datetime.datetime.utcfromtimestamp\(\) is deprecated:DeprecationWarning:proto.datetime_helpers
+    # Remove once https://github.com/grpc/grpc/issues/35086 is fixed
+    ignore:There is no current event loop:DeprecationWarning

tests/unit/test_iam.py

@@ -167,14 +167,15 @@ def test_owners_getter(self):
         assert policy.owners == expected
 
     def test_owners_setter(self):
-        import warnings
         from google.api_core.iam import OWNER_ROLE
 
         MEMBER = "user:phred@example.com"
         expected = set([MEMBER])
         policy = self._make_one()
 
-        with warnings.catch_warnings(record=True) as warned:
+        with pytest.warns(
+            DeprecationWarning, match="Assigning to 'owners' is deprecated."
+        ) as warned:
             policy.owners = [MEMBER]
 
         (warning,) = warned
@@ -191,14 +192,15 @@ def test_editors_getter(self):
         assert policy.editors == expected
 
     def test_editors_setter(self):
-        import warnings
         from google.api_core.iam import EDITOR_ROLE
 
         MEMBER = "user:phred@example.com"
         expected = set([MEMBER])
         policy = self._make_one()
 
-        with warnings.catch_warnings(record=True) as warned:
+        with pytest.warns(
+            DeprecationWarning, match="Assigning to 'editors' is deprecated."
+        ) as warned:
             policy.editors = [MEMBER]
 
         (warning,) = warned
@@ -215,14 +217,15 @@ def test_viewers_getter(self):
         assert policy.viewers == expected
 
     def test_viewers_setter(self):
-        import warnings
         from google.api_core.iam import VIEWER_ROLE
 
         MEMBER = "user:phred@example.com"
         expected = set([MEMBER])
         policy = self._make_one()
 
-        with warnings.catch_warnings(record=True) as warned:
+        with pytest.warns(
+            DeprecationWarning, match="Assigning to 'viewers' is deprecated."
+        ) as warned:
             policy.viewers = [MEMBER]
 
         (warning,) = warned
@@ -337,12 +340,13 @@ def test_to_api_repr_binding_wo_members(self):
         assert policy.to_api_repr() == {}
 
     def test_to_api_repr_binding_w_duplicates(self):
-        import warnings
         from google.api_core.iam import OWNER_ROLE
 
         OWNER = "group:cloud-logs@google.com"
         policy = self._make_one()
-        with warnings.catch_warnings(record=True):
+        with pytest.warns(
+            DeprecationWarning, match="Assigning to 'owners' is deprecated."
+        ):
             policy.owners = [OWNER, OWNER]
         assert policy.to_api_repr() == {
             "bindings": [{"role": OWNER_ROLE, "members": [OWNER]}]