refactor app directory structure and add tests

tests/node_modules/nightwatch/lib/api/client-commands/end.js

@@ -0,0 +1,70 @@
+var util = require('util');
+var events = require('events');
+var Utils = require('../../util/utils.js');
+var Logger = require('../../util/logger.js');
+
+/**
+ * Ends the session. Uses session protocol command.
+ *
+ * ```
+ * this.demoTest = function (browser) {
+ *   browser.end();
+ * };
+ * ```
+ *
+ * @method end
+ * @param {function} [callback] Optional callback function to be called when the command finishes.
+ * @see session
+ * @api commands
+ */
+function End() {
+  events.EventEmitter.call(this);
+}
+
+util.inherits(End, events.EventEmitter);
+
+End.prototype.command = function(callback) {
+  var self = this;
+  var client = this.client;
+
+  if (client.sessionId) {
+    if (this.testFailuresExist() && this.shouldTakeScreenshot()) {
+      var fileNamePath = Utils.getScreenshotFileName(client.api.currentTest, false, client.options.screenshots.path);
+      Logger.info('We have failures in "' + client.api.currentTest.name + '". Taking screenshot...');
+
+      client.api.saveScreenshot(fileNamePath, function(result, err) {
+        if (err || result.status !== 0)  {
+          Logger.warn('Error saving screenshot...', err || result);
+        }
+      });
+    }
+
+    client.api.session('delete', function(result) {
+      client.sessionId = client.api.sessionId = null;
+      self.complete(callback, result);
+    });
+  } else {
+    setImmediate(function() {
+      self.complete(callback, null);
+    });
+  }
+
+  return this.client.api;
+};
+
+End.prototype.testFailuresExist = function() {
+  return this.client.results.errors > 0 || this.client.results.failed > 0;
+};
+
+End.prototype.shouldTakeScreenshot = function() {
+  return this.client.options.screenshots.enabled && this.client.options.screenshots.on_failure;
+};
+
+End.prototype.complete = function(callback, result) {
+  if (typeof callback === 'function') {
+    callback.call(this, result);
+  }
+  this.emit('complete');
+};
+
+module.exports = End;