(command.CommandList
  children: [
    (command.Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (lhs_expr.LhsName name:test_description spids:[20])
          op: Equal
          rhs: {(SQ <'diff honors config option, diff.suppressBlankEmpty'>)}
          spids: [20]
        )
      ]
      spids: [20]
    )
    (C {(.)} {(./test-lib.sh)})
    (command.AndOr
      ops: [Op_DPipe]
      children: [
        (command.SimpleCommand
          words: [{(cat)}]
          redirects: [
            (redir.HereDoc
              op: <Redir_DLess '<<'>
              fd: 16777215
              here_begin: {(word_part.EscapedLiteralPart token:<Lit_EscapedChar '\\E'>) (OF)}
              here_end_span_id: 51
              stdin_parts: [
                ('diff --git a/f b/f\n')
                ('index 5f6a263..8cb8bae 100644\n')
                ('--- a/f\n')
                ('+++ b/f\n')
                ('@@ -1,2 +1,2 @@\n')
                ('\n')
                ('-x\n')
                ('+y\n')
              ]
            )
            (redir.Redir op:<Redir_Great '>'> fd:16777215 arg_word:{(exp)})
          ]
        )
        (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
      ]
    )
    (C {(test_expect_success)} {(DQ ($ VSub_Name '$test_description'))} 
      {
        (SQ <'printf "\\nx\\n" > f &&\n'> <'     git add f &&\n'> <'     git commit -q -m. f &&\n'> 
          <'     printf "\\ny\\n" > f &&\n'> <'     git config --bool diff.suppressBlankEmpty true &&\n'> <'     git diff f > actual &&\n'> 
          <'     test_cmp exp actual &&\n'> <'     perl -i.bak -p -e "s/^\\$/ /" exp &&\n'> 
          <'     git config --bool diff.suppressBlankEmpty false &&\n'> <'     git diff f > actual &&\n'> <'     test_cmp exp actual &&\n'> 
          <'     git config --bool --unset diff.suppressBlankEmpty &&\n'> <'     git diff f > actual &&\n'> <'     test_cmp exp actual\n'> <'     '>
        )
      }
    )
    (C {(test_done)})
  ]
)