Add NeoVim test runner

For the queries that can't be tested with `tree-sitter` itself.

scripts/minimal_init.lua

@@ -0,0 +1,32 @@
+local project_root =  "." -- FIXME: relies on current working directory
+
+vim.opt.runtimepath:append(vim.env.NVIM_PLENARY)
+vim.opt.runtimepath:append(vim.env.NVIM_TREESITTER)
+vim.opt.runtimepath:append(vim.env.NVIM_TREESITTER_TEXTOBJECTS)
+vim.opt.runtimepath:append(vim.env.NVIM_TREESITTER_PARSER)
+
+vim.cmd.runtime { "plugin/plenary.vim", bang = true }
+vim.cmd.runtime { "plugin/nvim-treesitter.lua", bang = true }
+vim.cmd.runtime { "plugin/nvim-treesitter-textobjects.lua", bang = true }
+
+vim.filetype.add({
+  extension = {
+    bp = "bp",
+  },
+})
+
+vim.o.swapfile = false
+vim.bo.swapfile = false
+
+local parser_config = require("nvim-treesitter.parsers").get_parser_configs()
+parser_config.bp = {
+  install_info = {
+    url = project_root,
+    files = {"src/parser.c"}, -- note that some parsers also require src/scanner.c or src/scanner.cc
+  },
+}
+
+require("nvim-treesitter.configs").setup({
+  indent = { enable = true },
+  highlight = { enable = true },
+})