Tests

improve format_items #154

Job	Run time
unit tests (ubuntu-22.04, https://github.com/neovim/neovim/releases/download/stable/nvim-linux-x8...	59s
unit tests (ubuntu-latest, https://github.com/neovim/neovim/releases/download/nightly/nvim-linux-...	1m 6s
unit tests (ubuntu-22.04, https://github.com/neovim/neovim/releases/download/v0.10.4/nvim-linux-x...	54s
	2m 59s

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