anchor.diff:      fastjsonschema
       jsonschema
       numpy
  -    marshmallow
  -    marshmallow-polyfield
       matplotlib
       networkx
       ply
       psutil
       python-constraint
  +    python-dateutil
       retworkx
       scipy
       sympy
  
positive.code:   preCheck = ''
      export PACKAGEDIR=$out/${python.sitePackages}
      echo "Moving Qiskit test files to package directory"
      cp -r $TMP/source/test $PACKAGEDIR
      cp -r $TMP/source/examples $PACKAGEDIR
      cp -r $TMP/source/qiskit/schemas/examples $PACKAGEDIR/qiskit/schemas/
  
      # run pytest from Nix's $out path
      pushd $PACKAGEDIR
  
negative.code: , fastjsonschema
  , jsonschema
  , numpy
  , networkx
  , ply
  , psutil
  , python-constraint
  , python-dateutil
  , retworkx
  , scipy
  , sympy
  