[test] Added failing test for `.save()` regression introduced by @russfrank in 36e061c4bd

test/mocks/mock-store.js

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+/*
+ * mock-store.js: Mock store for ensuring certain operations are actually called.
+ *
+ * (C) 2011, Nodejitsu Inc.
+ *
+ */
+
+var util = require('util'),
+    events = require('events'),
+    nconf = require('../../lib/nconf');
+
+var Mock = nconf.Mock = function () {
+  events.EventEmitter.call(this);
+  this.type = 'mock';
+};
+
+// Inherit from Memory store.
+util.inherits(Mock, events.EventEmitter);
+
+//
+// ### function save (value, callback)
+// #### @value {Object} _Ignored_ Left here for consistency
+// #### @callback {function} Continuation to respond to when complete.
+// Waits `1000ms` and then calls the callback and emits the `save` event.
+//
+Mock.prototype.save = function (value, callback) {
+  if (!callback && typeof value === 'function') {
+    callback = value;
+    value = null;
+  }
+  
+  var self = this;
+  
+  setTimeout(function () {
+    self.emit('save');
+    callback();
+  }, 1000);
+};

test/provider-save-test.js

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+/*
+ * provider-save-test.js: Ensures consistency for Provider `save` operations.
+ *
+ * (C) 2011, Nodejitsu Inc.
+ *
+ */
+
+var assert = require('assert'),
+    vows = require('vows'),
+    nconf = require('../lib/nconf');
+    
+//
+// Expose `nconf.Mock`
+//
+require('./mocks/mock-store');
+    
+vows.describe('nconf/provider').addBatch({
+  "When using nconf": {
+    "an instance of 'nconf.Provider'": {
+      "with a Mock store": {
+        topic: function () {
+          return nconf.use('mock');
+        },
+        "the save() method": {
+          topic: function () {
+            var mock = nconf.stores.mock,
+                that = this;
+                
+            mock.on('save', function () { that.saved = true });
+            nconf.save(this.callback);
+          },
+          "should actually save before responding": function () {
+            assert.isTrue(this.saved);
+          }
+        }
+      }
+    }
+  }
+}).export(module);