test: add tests for resume picker: select_pos

lua/tests/automated/pickers/resume_spec.lua

@@ -0,0 +1,12 @@
+-- Just skip on mac, it has flaky CI for some reason
+if vim.fn.has "mac" == 1 or require("telescope.utils").iswin then
+  return
+end
+
+local tester = require "telescope.testharness"
+
+describe("builtin.resume", function()
+  it("should select and open the file", function()
+    tester.run_file "resume__select_pos"
+  end)
+end)