ci(tests): use minimal init.lua for tests

.github/workflows/test.yaml

@@ -21,12 +21,6 @@ jobs:
           wget -q https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.deb -O /tmp/nvim.deb
           sudo dpkg -i /tmp/nvim.deb
 
-      - name: Fetch dependencies
-        run: |
-          git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
-          git clone --depth 1 https://github.com/kyazdani42/nvim-web-devicons ~/.local/share/nvim/site/pack/vendor/start/nvim-web-devicons
-          ln -s $(pwd) ~/.local/share/nvim/site/pack/vendor/start
-
       - name: Run tests
         run: |
           nvim --version

.gitignore

@@ -0,0 +1 @@
+.tests/

tests/minimal.vim

@@ -1,3 +0,0 @@
-set rtp+=.
-set rtp+=../plenary.nvim
-runtime! plugin/plenary.vim

tests/minimal_init.lua

@@ -0,0 +1,39 @@
+local M = {}
+
+function M.root(root)
+  local f = debug.getinfo(1, "S").source:sub(2)
+  return vim.fn.fnamemodify(f, ":p:h:h") .. "/" .. (root or "")
+end
+
+---@param plugin string
+function M.load(plugin)
+  local name = plugin:match(".*/(.*)")
+  local package_root = M.root(".tests/site/pack/deps/start/")
+  if not vim.loop.fs_stat(package_root .. name) then
+    print("Installing " .. plugin)
+    vim.fn.mkdir(package_root, "p")
+    vim.fn.system({
+      "git",
+      "clone",
+      "--depth=1",
+      "https://github.com/" .. plugin .. ".git",
+      package_root .. "/" .. name,
+    })
+  end
+end
+
+function M.setup()
+  vim.cmd([[set runtimepath=$VIMRUNTIME]])
+  vim.opt.runtimepath:append(M.root())
+  vim.opt.packpath = { M.root(".tests/site") }
+  M.load("nvim-lua/plenary.nvim")
+  vim.env.XDG_CONFIG_HOME = M.root(".tests/config")
+  vim.env.XDG_DATA_HOME = M.root(".tests/data")
+  vim.env.XDG_STATE_HOME = M.root(".tests/state")
+  vim.env.XDG_CACHE_HOME = M.root(".tests/cache")
+end
+
+vim.o.swapfile = false
+_G.__TEST = true
+
+M.setup()