(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'histogram diff algorithm'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./test-lib.sh'>})
    (C {<.>} {(DQ ($ Id.VSub_DollarName '$TEST_DIRECTORY')) <'/lib-diff-alternative.sh'>})
    (C {<test_diff_frobnitz>} {(DQ <histogram>)})
    (C {<test_diff_unique>} {(DQ <histogram>)})
    (C {<test_done>})
  ]
)