Do some checks before adding the filters to allow users to silence these warnings.

Author: ionelmc

CHANGELOG.rst

@@ -13,6 +13,20 @@ Changelog
 
   This fixes most of the bad interactions that are occurring on pytest 8.4 with ``filterwarnings=error``.
 
+  The plugin will check if there already matching rules for the 3 categories
+  (``ResourceWarning``, ``PytestCovWarning``, ``CoverageWarning``) and message (``unclosed database in <sqlite3.Connection object at``) before adding the filters.
+
+  This means you can have this in your pytest configuration for complete oblivion (not recommended, if that is not clear)::
+
+    filterwarnings = [
+        "error",
+        "ignore:unclosed database in <sqlite3.Connection object at:ResourceWarning",
+        "ignore::PytestCovWarning",
+        "ignore::CoverageWarning",
+    ]
+
+
+
 6.1.1 (2025-04-05)
 ------------------
 

src/pytest_cov/plugin.py

@@ -2,6 +2,7 @@
 
 import argparse
 import os
+import re
 import warnings
 from io import StringIO
 from pathlib import Path
@@ -22,6 +23,8 @@
 if TYPE_CHECKING:
     from .engine import CovController
 
+COVERAGE_SQLITE_WARNING_RE = re.compile('unclosed database in <sqlite3.Connection object at', re.I)
+
 
 def validate_report(arg):
     file_choices = ['annotate', 'html', 'xml', 'json', 'lcov']
@@ -315,9 +318,21 @@ def _should_report(self):
     @pytest.hookimpl(hookwrapper=True)
     def pytest_runtestloop(self, session):
         # override some warning configuration to prevent certain warnings to bubble up as errors due to rigid filterwarnings configuration
-        warnings.filterwarnings('default', 'unclosed database in <sqlite3.Connection object at', ResourceWarning)
-        warnings.simplefilter('once', PytestCovWarning)
-        warnings.simplefilter('once', CoverageWarning)
+        for _, message, category, _, _ in warnings.filters:
+            if category is ResourceWarning and message == COVERAGE_SQLITE_WARNING_RE:
+                break
+        else:
+            warnings.filterwarnings('default', 'unclosed database in <sqlite3.Connection object at', ResourceWarning)
+        for _, _, category, _, _ in warnings.filters:
+            if category is PytestCovWarning:
+                break
+        else:
+            warnings.simplefilter('once', PytestCovWarning)
+        for _, _, category, _, _ in warnings.filters:
+            if category is CoverageWarning:
+                break
+        else:
+            warnings.simplefilter('once', CoverageWarning)
 
         yield