bugfix: only add setup vals to context once

see test case, this was failing before because it was overwriting the
previous context value.

Author: Matt Lyon

lib/vows.js

@@ -220,10 +220,11 @@ vows.tell = function (topic, tests) {
             // functions have access to all the previous context topics in their
             // arguments list.
             // It is defined and invoked at the same time.
-            // If it encouters a `setup` function, it waits for the returned
+            // If it encounters a `setup` function, it waits for the returned
             // promise to emit (the topic), at which point it runs the functions under it,
             // passing the topic as an argument.
             (function run(ctx) {
+                var ctxAdded = false;
                 if (typeof(ctx.tests["setup"]) === 'function') {
                     // Run the setup, passing the previous context topics
                     setup = ctx.tests.setup.apply(this, ctx.topics);
@@ -237,6 +238,13 @@ vows.tell = function (topic, tests) {
                             return function () { emitter.emit("success", val) };
                         }(setup)); setup = emitter;
                     }
+
+                    setup.addListener('success', function (val) {
+                        // Once the setup fires, add the return value
+                        // to the beginning of the topics list, so it
+                        // becomes the first argument for the next setup.
+                        ctx.topics.unshift(val);
+                    });
                 } else { setup = null }
 
                 // Now run the tests, or sub-contexts
@@ -260,10 +268,6 @@ vows.tell = function (topic, tests) {
                         if (setup) {
                             setup.addListener("success", function (vow, ctx) {
                                 return function (val) {
-                                    // Once the setup fires, add the return value
-                                    // to the beginning of the topics list, so it
-                                    // becomes the first argument for the next setup.
-                                    ctx.topics.unshift(val);
                                     return run(new(Context)(vow, ctx));
                                 };
                             }(vow, ctx));

test/vows-test.js

@@ -58,6 +58,14 @@ vows.tell("Vows", {
                     "the parent topics": function (topics) {
                         assert.equal(topics.join(), [4, 3, 2, 1].join());
                     }
+                },
+
+                "from": {
+                    setup: function (c, b, a) { return promiser([4, c, b, a])() },
+
+                    "the parent topics": function(topics) {
+                        assert.equal(topics.join(), [4, 3, 2, 1].join());
+                    }
                 }
             }
         }