Add unit tests for calculator

calculator/lib/python3.12/site-packages/coverage/pth_file.py

@@ -0,0 +1,16 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/coveragepy/coveragepy/blob/main/NOTICE.txt
+
+# pylint: disable=missing-module-docstring
+# pragma: exclude file from coverage
+# This will become the .pth file for subprocesses.
+
+import os
+
+if os.getenv("COVERAGE_PROCESS_START") or os.getenv("COVERAGE_PROCESS_CONFIG"):
+    try:
+        import coverage
+    except:  # pylint: disable=bare-except
+        pass
+    else:
+        coverage.process_startup(slug="pth")