Implement couch_tests:setup/1
diff --git a/src/couch_tests.erl b/src/couch_tests.erl
index 3d53d31..5dff3c5 100644
--- a/src/couch_tests.erl
+++ b/src/couch_tests.erl
@@ -14,6 +14,7 @@
 
 -export([
     new/4,
+    setup/1,
     setup/3,
     teardown/1
 ]).
@@ -53,6 +54,9 @@
         teardown = Teardown
     }.
 
+setup(Chain) ->
+    setup(Chain, [], []).
+
 setup(Chain, Args, Opts) ->
     Ctx = #couch_tests_ctx{chain = Chain, args = Args, opts = Opts},
     do_setup(Chain, Ctx, []).