Fix ruff and license header issues

Author: alisha-10000

testing/qumat/test_qdp_module.py

@@ -1,3 +1,19 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import sys
 import builtins
 import pytest
@@ -24,7 +40,7 @@ def fake_import(name, *args, **kwargs):
     monkeypatch.setattr(builtins, "__import__", fake_import)
 
     with pytest.warns(ImportWarning):
-        import qumat.qdp
+        pass
 
 
 def test_qdp_engine_stub_raises_import_error():
@@ -57,4 +73,4 @@ def test_make_stub_direct_call():
     StubClass = qdp._make_stub("TestStub")
 
     with pytest.raises(ImportError):
-        StubClass()
+        StubClass()