fix: restore testing framework to actually work (#2070)

after refactor to some new asynchronous items for finders,
the tests stopped actually doing anything.

now they do things again.

lua/telescope/testharness/helpers.lua

@@ -0,0 +1,56 @@
+local test_helpers = {}
+
+test_helpers.get_picker = function()
+  local state = require "telescope.state"
+  return state.get_status(vim.api.nvim_get_current_buf()).picker
+end
+
+test_helpers.get_results_bufnr = function()
+  local state = require "telescope.state"
+  return state.get_status(vim.api.nvim_get_current_buf()).results_bufnr
+end
+
+test_helpers.get_file = function()
+  return vim.fn.fnamemodify(vim.api.nvim_buf_get_name(0), ":t")
+end
+
+test_helpers.get_prompt = function()
+  return vim.api.nvim_buf_get_lines(0, 0, -1, false)[1]
+end
+
+test_helpers.get_results = function()
+  return vim.api.nvim_buf_get_lines(test_helpers.get_results_bufnr(), 0, -1, false)
+end
+
+test_helpers.get_best_result = function()
+  local results = test_helpers.get_results()
+  local picker = test_helpers.get_picker()
+
+  if picker.sorting_strategy == "ascending" then
+    return results[1]
+  else
+    return results[#results]
+  end
+end
+
+test_helpers.get_selection = function()
+  local state = require "telescope.state"
+  return state.get_global_key "selected_entry"
+end
+
+test_helpers.get_selection_value = function()
+  return test_helpers.get_selection().value
+end
+
+test_helpers.make_globals = function()
+  GetFile = test_helpers.get_file -- luacheck: globals GetFile
+  GetPrompt = test_helpers.get_prompt -- luacheck: globals GetPrompt
+
+  GetResults = test_helpers.get_results -- luacheck: globals GetResults
+  GetBestResult = test_helpers.get_best_result -- luacheck: globals GetBestResult
+
+  GetSelection = test_helpers.get_selection -- luacheck: globals GetSelection
+  GetSelectionValue = test_helpers.get_selection_value -- luacheck: globals GetSelectionValue
+end
+
+return test_helpers