The main annoyance cleaned up here is the need to modify the test whenever unit tests for Utilities are added or removed.

Also runs the test in a temporary directory to simplify cleanup and not have to guess at nonexistent file names, and factors out some repeated code.

Proposed changes

Upgrade instructions

Code review checklist

• The code is documented and the documentation renders correctly. Run
  make doc to generate the documentation locally into BUILD_DIR/docs/html.
  Then open index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.
• The PR lists upgrade instructions and is labeled bugfix or
  new feature if appropriate.

Further comments