Add test for unmatch license-files pattern

Author: abravalheri

setuptools/tests/config/test_apply_pyprojecttoml.py

@@ -448,6 +448,14 @@ def test_default_patterns(self, tmp_path):
         assert (tmp_path / "LICENSE.txt").exists()  # from base example
         assert set(dist.metadata.license_files) == {*license_files, "LICENSE.txt"}
 
+    def test_missing_patterns(self, tmp_path):
+        pyproject = self.base_pyproject_license_pep639(tmp_path)
+        assert list(tmp_path.glob("_FILE*")) == []  # sanity check
+
+        msg = "Cannot find any license files for the given patterns."
+        with pytest.warns(SetuptoolsDeprecationWarning, match=msg):
+            pyprojecttoml.apply_configuration(makedist(tmp_path), pyproject)
+
 
 class TestPyModules:
     # https://github.com/pypa/setuptools/issues/4316