functests: Add tests for ShaDa variables dumping/reading

test/functional/shada/helpers.lua

@@ -0,0 +1,53 @@
+local helpers = require('test.functional.helpers')
+local spawn, set_session, nvim, nvim_prog =
+  helpers.spawn, helpers.set_session, helpers.nvim, helpers.nvim_prog
+
+local tmpname = os.tmpname()
+local additional_cmd = ''
+
+local function nvim_argv()
+  local ret
+  local nvim_argv = {nvim_prog, '-u', 'NONE', '-i', tmpname, '-N',
+                     '--cmd', 'set shortmess+=I background=light noswapfile',
+                     '--cmd', additional_cmd,
+                     '--embed'}
+  if helpers.prepend_argv then
+    ret = {}
+    for i, v in ipairs(helpers.prepend_argv) do
+      ret[i] = v
+    end
+    local shift = #ret
+    for i, v in ipairs(nvim_argv) do
+      ret[i + shift] = v
+    end
+  else
+    ret = nvim_argv
+  end
+  return ret
+end
+
+local session = nil
+
+local reset = function()
+  if session then
+    session:exit(0)
+  end
+  session = spawn(nvim_argv())
+  set_session(session)
+  nvim('set_var', 'tmpname', tmpname)
+end
+
+local set_additional_cmd = function(s)
+  additional_cmd = s
+end
+
+local clear = function()
+  os.remove(tmpname)
+  set_additional_cmd('')
+end
+
+return {
+  reset=reset,
+  set_additional_cmd=set_additional_cmd,
+  clear=clear,
+}