Add tests for Path.expand("/") to be "/" (the issue is already fixed).

Author: k14i

lib/elixir/test/elixir/path_test.exs

@@ -94,6 +94,8 @@ defmodule PathTest do
   end
 
   test :expand_path do
+    assert (Path.expand("/") |> strip_drive_letter_if_windows) == "/"
+    assert (Path.expand("/foo") |> strip_drive_letter_if_windows) == "/foo"
     assert (Path.expand("/foo/bar") |> strip_drive_letter_if_windows) == "/foo/bar"
     assert (Path.expand("/foo/bar/") |> strip_drive_letter_if_windows) == "/foo/bar"
     assert (Path.expand("/foo/bar/.") |> strip_drive_letter_if_windows)== "/foo/bar"