(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'Tests rebase performance'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./perf-lib.sh'>})
    (C {<test_perf_default_repo>})
    (C {<test_expect_success>} {(SQ <setup>)} 
      {
        (SQ <'\n'> <'\tgit checkout -f -b base &&\n'> <'\tgit checkout -b to-rebase &&\n'> 
          <'\tgit checkout -b upstream &&\n'> <'\tfor i in $(seq 100)\n'> <'\tdo\n'> <'\t\t# simulate huge diffs\n'> 
          <'\t\techo change$i >unrelated-file$i &&\n'> <'\t\tseq 1000 >>unrelated-file$i &&\n'> <'\t\tgit add unrelated-file$i &&\n'> <'\t\ttest_tick &&\n'> 
          <'\t\tgit commit -m commit$i unrelated-file$i &&\n'> <'\t\techo change$i >unrelated-file$i &&\n'> <'\t\tseq 1000 | tac >>unrelated-file$i &&\n'> 
          <'\t\tgit add unrelated-file$i &&\n'> <'\t\ttest_tick &&\n'> <'\t\tgit commit -m commit$i-reverse unrelated-file$i ||\n'> <'\t\tbreak\n'> 
          <'\tdone &&\n'> <'\tgit checkout to-rebase &&\n'> <'\ttest_commit our-patch interesting-file\n'>
        )
      }
    )
    (C {<test_perf>} {(SQ <'rebase on top of a lot of unrelated changes'>)} 
      {(SQ <'\n'> <'\tgit rebase --onto upstream HEAD^ &&\n'> <'\tgit rebase --onto base HEAD^\n'>)}
    )
    (C {<test_done>})
  ]
)