Add tests for base_dir reconfiguration

Tests both absolutes and relative paths.

test/rebar_dir_SUITE.erl

@@ -5,7 +5,7 @@
 -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").
@@ -15,7 +15,7 @@
 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].
+          retarget_path, alt_base_dir_abs, alt_base_dir_rel].
 
 init_per_testcase(_, Config) ->
     C = rebar_test_utils:init_rebar_state(Config),
@@ -124,4 +124,41 @@ retarget_path(Config) ->
     ?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")).
+                 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"]))).