diff --git a/tests/test_should_ignore_error.py b/tests/test_should_ignore_error.py
new file mode 100644
index 00000000..fd06436b
--- /dev/null
+++ b/tests/test_should_ignore_error.py
@@ -0,0 +1,7 @@
+import pytest
+from flask import Flask
+
+def test_should_ignore_error_deprecation_warning():
+    app = Flask(__name__)
+    with pytest.warns(DeprecationWarning):
+        assert app.should_ignore_error(None) is False
\ No newline at end of file