Tmain(client): add test for vista.vim

Tmain/client-vista-vim-fields-expectation.d/README.md

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+If your change breaks this test case, notify the change
+to https://github.com/liuchengxu/vista.vim.

Tmain/client-vista-vim-fields-expectation.d/exit-expected.txt

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+0

Tmain/client-vista-vim-fields-expectation.d/run.sh

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+# Copyright: 2021 <https://github.com/liuchengxu>
+# License: GPL-2
+
+CTAGS=$1
+
+. ../utils.sh
+
+is_feature_available "${CTAGS}" json
+
+$CTAGS --format=2 --excmd=pattern --fields=+nksSaf --extras=+F --sort=no --append=no --extras=  --language-force=vim --vim-kinds=acfvmn --output-format=json --fields=-PF -f- test.vim
+
+exit $?

Tmain/client-vista-vim-fields-expectation.d/stdout-expected.txt

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+{"_type": "tag", "name": "s:cur_dir", "line": 1, "kind": "variable"}
+{"_type": "tag", "name": "vista#FindItemsUnderDirectory", "line": 3, "signature": "(dir)", "kind": "function"}

Tmain/client-vista-vim-fields-expectation.d/test.vim

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+let s:cur_dir = fnamemodify(resolve(expand('<sfile>:p')), ':h')
+
+function! vista#FindItemsUnderDirectory(dir) abort
+  return map(split(globpath(a:dir, '*'), '\n'), 'fnamemodify(v:val, '':t:r'')')
+endfunction