Move logic to error out on deprecation warnings into conftest (#14902)

Author: carmocca

setup.cfg

@@ -33,8 +33,6 @@ addopts =
 markers =
     cloud:Run the cloud tests for example
 filterwarnings =
-    # error out on our deprecation warnings - ensures the code and tests are kept up-to-date
-    error::pytorch_lightning.utilities.rank_zero.LightningDeprecationWarning
     error::FutureWarning
 xfail_strict = true
 junit_duration_report = call

tests/tests_lite/conftest.py

@@ -144,3 +144,10 @@ def pytest_collection_modifyitems(items: List[pytest.Function], config: pytest.C
             bold=True,
             purple=True,  # oh yeah, branded pytest messages
         )
+
+    # error out on our deprecation warnings - ensures the code and tests are kept up-to-date
+    deprecation_error = pytest.mark.filterwarnings(
+        "error::lightning_lite.utilities.rank_zero.LightningDeprecationWarning",
+    )
+    for item in items:
+        item.add_marker(deprecation_error)

tests/tests_pytorch/conftest.py

@@ -260,6 +260,13 @@ def pytest_collection_modifyitems(items: List[pytest.Function], config: pytest.C
             purple=True,  # oh yeah, branded pytest messages
         )
 
+    # error out on our deprecation warnings - ensures the code and tests are kept up-to-date
+    deprecation_error = pytest.mark.filterwarnings(
+        "error::lightning_lite.utilities.rank_zero.LightningDeprecationWarning",
+    )
+    for item in items:
+        item.add_marker(deprecation_error)
+
 
 def pytest_addoption(parser):
     parser.addoption("--hpus", action="store", type=int, default=1, help="Number of hpus 1-8")