refactor app directory structure and add tests

tests/node_modules/nightwatch/lib/api/expect/visible.js

@@ -0,0 +1,49 @@
+/**
+ * Property that asserts the visibility of a specified element.
+ *
+ * ```
+ * this.demoTest = function (browser) {
+ *   browser.expect.element('#main').to.be.visible;
+ *   browser.expect.element('#main').to.not.be.visible;
+ *   browser.expect.element('#main').to.be.visible.before(100);
+ * };
+ * ```
+ *
+ * @display .visible
+ * @method visible
+ * @api expect
+ */
+var util = require('util');
+var BaseAssertion = require('./_baseAssertion.js');
+
+function VisibleAssertion() {
+  BaseAssertion.call(this);
+
+  this.message = 'Expected element <%s> to ' + (this.negate ? 'not be visible' : 'be visible');
+  this.start();
+}
+
+util.inherits(VisibleAssertion, BaseAssertion);
+
+VisibleAssertion.prototype.executeCommand = function(callback) {
+  this.protocol.elementIdDisplayed(this.elementResult.ELEMENT, callback);
+};
+
+VisibleAssertion.prototype.elementFound = function() {
+  this.passed = this.negate ? this.resultValue === false : this.resultValue;
+  this.expected = this.negate ? 'not visible' : 'visible';
+  this.actual = this.resultValue ? 'visible' : 'not visible';
+
+  if (this.passed && this.waitForMs) {
+    this.elapsedTime = this.getElapsedTime();
+    this.messageParts.push(' - condition was met in ' + this.elapsedTime + 'ms');
+  }
+};
+
+VisibleAssertion.prototype.elementNotFound = function() {
+  this.passed = false;
+  this.expected = this.negate ? 'not visible' : 'visible';
+  this.actual = 'not found';
+};
+
+module.exports = VisibleAssertion;