Add missing license header.

Author: david-cattermole

tests/test/test_api/test_marker_attr_mapping.py

@@ -1,3 +1,20 @@
+# Copyright (C) 2019, 2020, 2025 David Cattermole.
+#
+# This file is part of mmSolver.
+#
+# mmSolver is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# mmSolver is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with mmSolver.  If not, see <https://www.gnu.org/licenses/>.
+#
 """
 Test querying DG relationship information between Markers and
 Attributes.