anchor.diff:  -export([default_src_dirs/1, default_extra_src_dirs/1, default_all_src_dirs/1]).
   -export([src_dirs/1, extra_src_dirs/1, all_src_dirs/1]).
   -export([profile_src_dirs/1, profile_extra_src_dirs/1, profile_all_src_dirs/1]).
  --export([retarget_path/1]).
  +-export([retarget_path/1, alt_base_dir_abs/1, alt_base_dir_rel/1]).
   
   -include_lib("common_test/include/ct.hrl").
   -include_lib("eunit/include/eunit.hrl").
  
positive.code: all() -> [default_src_dirs, default_extra_src_dirs, default_all_src_dirs,
            src_dirs, extra_src_dirs, all_src_dirs,
            profile_src_dirs, profile_extra_src_dirs, profile_all_src_dirs,
            retarget_path].
  
  init_per_testcase(_, Config) ->
      C = rebar_test_utils:init_rebar_state(Config),
  
negative.code:     ?assertEqual(filename:join([BaseDir, "some_other_dir"]),
                   rebar_dir:retarget_path(State, filename:join([rebar_dir:root_dir(State), "some_other_dir"]))),
      ?assertEqual("/somewhere/outside/the/project",
                   rebar_dir:retarget_path(State, "/somewhere/outside/the/project")).
  
  alt_base_dir_abs(Config) ->
      AltName = lists:flatten(io_lib:format("~p", [os:timestamp()])),
      AltBaseDir = filename:join(?config(priv_dir, Config), AltName),
      RebarConfig = [{base_dir, AltBaseDir}],
      {ok, State} = rebar_test_utils:run_and_check(Config, RebarConfig, ["compile"], return),
  
      BaseDir = rebar_dir:base_dir(State),
      ?assertEqual(filename:join(AltBaseDir, "default"), BaseDir),
  
      Name1 = ?config(app_one, Config),
      Name2 = ?config(app_two, Config),
  
      ?assert(filelib:is_dir(filename:join([BaseDir, "lib", Name1, "ebin"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name1, "ebin", Name1++".app"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name1, "ebin", Name1++".beam"]))),
      ?assert(filelib:is_dir(filename:join([BaseDir, "lib", Name2, "ebin"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name2, "ebin", Name2++".app"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name2, "ebin", Name2++".beam"]))).
  
  alt_base_dir_rel(Config) ->
      AltName = lists:flatten(io_lib:format("~p", [os:timestamp()])),
      AltBaseDir = filename:join("..", AltName),
      RebarConfig = [{base_dir, AltBaseDir}],
      {ok, State} = rebar_test_utils:run_and_check(Config, RebarConfig, ["compile"], return),
  
      BaseDir = rebar_dir:base_dir(State),
  
      Name1 = ?config(app_one, Config),
      Name2 = ?config(app_two, Config),
  
      ?assert(filelib:is_dir(filename:join([BaseDir, "lib", Name1, "ebin"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name1, "ebin", Name1++".app"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name1, "ebin", Name1++".beam"]))),
      ?assert(filelib:is_dir(filename:join([BaseDir, "lib", Name2, "ebin"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name2, "ebin", Name2++".app"]))),
      ?assert(filelib:is_file(filename:join([BaseDir, "lib", Name2, "ebin", Name2++".beam"]))).
  