initial concept

src/scenario/Future.js

@@ -0,0 +1,57 @@
+function Future(name, behavior) {
+  this.value = undefined;
+  this.name = name;
+  this.behavior = behavior;
+  this.fulfilled = false;
+}
+
+Future.prototype = {
+  fulfill: function(value){
+    this.fulfilled = true;
+    this.value = value;
+  }
+};
+
+function future(name, behavior) {
+  return new Future(name, behavior);
+};
+
+function repeater(selector) {
+  var repeaterFuture = future('repeater ' + selector, function(done) {
+    done($(selector));
+  });
+
+  repeaterFuture.count =  function(){
+    return future(repeaterFuture.name + ' count', function(done) {
+      done(repeaterFuture.value.size());
+    });
+  };
+
+  return repeaterFuture;
+}
+
+function Matcher(future, logger) {
+  var self = this;
+  this.logger = logger;
+  this.future = future;
+}
+
+Matcher.addMatcher = function(name, matcher){
+  Matcher.prototype[name] = function(expected) {
+    var future = this.future;
+    $scenario.addFuture(
+      'expect ' + future.name + ' ' + name + ' ' + expected,
+      function(done){
+        if (matcher(future.value, expected))
+          throw "Expected " + expected + ' but was ' + future.value;
+        done();
+      }
+    );
+  };
+};
+
+Matcher.addMatcher('toEqual', function(a,b){ return a == b; });
+
+function expect(future) {
+  return new Matcher(future, window.alert);
+}