test(lua/runtime_spec): add test for ftplugin ordering

1 files changed, 24 insertions, 0 deletions

diff --git a/test/functional/lua/runtime_spec.lua b/test/functional/lua/runtime_spec.lua
index cd19ea4e49..e80a65ef3d 100644
--- a/test/functional/lua/runtime_spec.lua
+++ b/test/functional/lua/runtime_spec.lua
@@ -138,6 +138,30 @@ describe('runtime:', function()
       exec [[set filetype=new-ft]]
       eq(1, eval('b:lua_ftplugin'))
     end)
+
+    it("'rtp' order is respected", function()
+      local after_ftplugin_folder = table.concat({plug_dir, 'after', 'ftplugin'}, sep)
+      mkdir_p(table.concat({ftplugin_folder, 'new-ft'}, sep))
+      mkdir_p(table.concat({after_ftplugin_folder, 'new-ft'}, sep))
+      exec('set rtp+=' .. plug_dir .. '/after')
+      exec('let g:seq = ""')
+      -- A .lua file is loaded after a .vim file if they only differ in extension.
+      -- All files in after/ftplugin/ are loaded after all files in ftplugin/.
+      write_file(table.concat({ftplugin_folder, 'new-ft.vim'}, sep), [[let g:seq ..= 'A']])
+      write_file(table.concat({ftplugin_folder, 'new-ft.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'B']])
+      write_file(table.concat({ftplugin_folder, 'new-ft_a.vim'}, sep), [[let g:seq ..= 'C']])
+      write_file(table.concat({ftplugin_folder, 'new-ft_a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'D']])
+      write_file(table.concat({ftplugin_folder, 'new-ft', 'a.vim'}, sep), [[let g:seq ..= 'E']])
+      write_file(table.concat({ftplugin_folder, 'new-ft', 'a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'F']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft.vim'}, sep), [[let g:seq ..= 'a']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'b']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft_a.vim'}, sep), [[let g:seq ..= 'c']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft_a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'd']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft', 'a.vim'}, sep), [[let g:seq ..= 'e']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft', 'a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'f']])
+      exec('setfiletype new-ft')
+      eq('ABCDEFabcdef', eval('g:seq'))
+    end)
   end)
 
   describe('indent', function()