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/pickers/_test_helpers.lua

@@ -1,56 +0,0 @@
-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