(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'test read-tree into a fresh index file'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./test-lib.sh'>})
    (C {<test_expect_success>} {<setup>} 
      {(SQ <'\n'> <'\techo one >a &&\n'> <'\tgit add a &&\n'> <'\tgit commit -m initial\n'>)}
    )
    (C {<test_expect_success>} {(SQ <'non-existent index file'>)} 
      {(SQ <'\n'> <'\trm -f new-index &&\n'> <'\tGIT_INDEX_FILE=new-index git read-tree master\n'>)}
    )
    (C {<test_expect_success>} {(SQ <'empty index file'>)} 
      {
        (SQ <'\n'> <'\trm -f new-index &&\n'> <'\t> new-index &&\n'> 
          <'\tGIT_INDEX_FILE=new-index git read-tree master\n'>
        )
      }
    )
    (C {<test_done>})
  ]
)