(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'Test --follow should always find copies hard in git log.\n'> <'\n'>)}
          spids: [13]
        )
      ]
    )
    (C {<.>} {<./test-lib.sh>})
    (C {<.>} {(DQ ($ Id.VSub_DollarName '$TEST_DIRECTORY')) </diff-lib.sh>})
    (command.Simple
      words: [{<echo>} {(SQ <'Line 1\n'> <'Line 2\n'> <'Line 3\n'>)}]
      redirects: [(redir.Redir op:<Id.Redir_Great '>'> fd:-1 arg_word:{<path0>})]
    )
    (C {<test_expect_success>} {(SQ <'add a file path0 and commit.'>)} 
      {(SQ <'git add path0 &&\n'> <'     git commit -m "Add path0"'>)}
    )
    (command.Simple
      words: [{<echo>} {(SQ <'New line 1\n'> <'New line 2\n'> <'New line 3\n'>)}]
      redirects: [(redir.Redir op:<Id.Redir_Great '>'> fd:-1 arg_word:{<path0>})]
    )
    (C {<test_expect_success>} {(SQ <'Change path0.'>)} 
      {(SQ <'git add path0 &&\n'> <'     git commit -m "Change path0"'>)}
    )
    (command.Simple
      words: [{<cat>}]
      redirects: [
        (redir.Redir op:<Id.Redir_Less '<'> fd:-1 arg_word:{<path0>})
        (redir.Redir op:<Id.Redir_Great '>'> fd:-1 arg_word:{<path1>})
      ]
    )
    (C {<test_expect_success>} {(SQ <'copy path0 to path1.'>)} 
      {(SQ <'git add path1 &&\n'> <'     git commit -m "Copy path1 from path0"'>)}
    )
    (C {<test_expect_success>} {(SQ <'find the copy path0 -> path1 harder'>)} 
      {(SQ <'git log --follow --name-status --pretty="format:%s"  path1 > current'>)}
    )
    (command.Simple
      words: [{<cat>}]
      redirects: [
        (redir.Redir op:<Id.Redir_Great '>'> fd:-1 arg_word:{<expected>})
        (redir.HereDoc
          op: <Id.Redir_DLess '<<'>
          fd: -1
          here_begin: {(word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\E'>) <OF>}
          here_end_span_id: 142
          stdin_parts: [
            <'Copy path1 from path0\n'>
            <'C100\tpath0\tpath1\n'>
            <'\n'>
            <'Change path0\n'>
            <'M\tpath0\n'>
            <'\n'>
            <'Add path0\n'>
            <'A\tpath0\n'>
          ]
        )
      ]
    )
    (C {<test_expect_success>} {(SQ <'validate the output.'>)} 
      {(SQ <'compare_diff_patch current expected'>)}
    )
    (C {<test_done>})
  ]
)