don't filter eunit test modules based on file extension

stops the eunit provider from filtering out test modules based on the
file extension. previously, it was hardcoded to expect all test files
ended in `.erl`. this change allows for endings like `.lfe` and `.beam`

src/rebar_prv_eunit.erl

@@ -198,8 +198,8 @@ dedupe_tests({AppMods, TestMods}) ->
     %% for each modules in TestMods create a test if there is not a module
     %% in AppMods that will trigger it
     F = fun(Mod) ->
-        M = filename:basename(Mod, ".erl"),
-        MatchesTest = fun(Dir) -> filename:basename(Dir, ".erl") ++ "_tests" == M end,
+        M = filename:rootname(filename:basename(Mod)),
+        MatchesTest = fun(Dir) -> filename:rootname(filename:basename(Dir)) ++ "_tests" == M end,
         case lists:any(MatchesTest, AppMods) of
             false -> {true, {module, list_to_atom(M)}};
             true  -> false