refactor app directory structure and add tests

tests/node_modules/nightwatch/lib/api/assertions/urlContains.js

@@ -0,0 +1,35 @@
+/**
+ * Checks if the current URL contains the given value.
+ *
+ * ```
+ *    this.demoTest = function (client) {
+ *      browser.assert.urlContains('google');
+ *    };
+ * ```
+ *
+ * @method urlContains
+ * @param {string} expected The value expected to exist within the current URL.
+ * @param {string} [message] Optional log message to display in the output. If missing, one is displayed by default.
+ * @api assertions
+ */
+
+var util = require('util');
+exports.assertion = function(expected, msg) {
+
+  this.message = msg || util.format('Testing if the URL contains "%s".', expected);
+  this.expected = expected;
+
+  this.pass = function(value) {
+    return value.indexOf(this.expected) > -1;
+  };
+
+  this.value = function(result) {
+    return result.value;
+  };
+
+  this.command = function(callback) {
+    this.api.url(callback);
+    return this;
+  };
+
+};