make run the default action of a test in tester

tests/async/tasyncssl.nim

@@ -63,5 +63,3 @@ when defined(ssl):
 
   assert msgCount == swarmSize * messagesToSend
   echo msgCount
-
-

tests/async/tfuturevar.nim

@@ -1,3 +1,8 @@
+discard """
+action: compile
+"""
+# XXX: action should be run!
+
 import asyncdispatch
 
 proc completeOnReturn(fut: FutureVar[string], x: bool) {.async.} =
@@ -44,4 +49,3 @@ proc main() {.async.} =
 
 
 waitFor main()
-