refs #240 - added assertNotVisible

@@ -20,6 +20,7 @@ XXXX-XX-XX, v1.0.0
 - fixed [#231](https://github.com/n1k0/casperjs/pull/231) - added `--pre` and `--post` options to the `casperjs test` command to load test files before and after the execution of testsuite 
 - fixed [#222](https://github.com/n1k0/casperjs/pull/222) & [#211](https://github.com/n1k0/casperjs/issues/211) - Change mouse event to include an X + Y value for click position
 - fixed [#232](https://github.com/n1k0/casperjs/issues/232) - symlink resolution in the ruby version of the `casperjs` executable
+- fixed [#240](https://github.com/n1k0/casperjs/pull/240/) - added new tester methods: `assertVisible` and `assertNotVisible`
 - added [`ClientUtils.getDocumentHeight()`](http://casperjs.org/api.html#clientutils.getDocumentHeight)
 - added a `--no-colors` option to the `casper test` command to skip output coloration
 

@@ -353,6 +353,23 @@ var Tester = function Tester(casper, options) {
     };
 
     /**
+     * Asserts that a selector expression is not currently visible.
+     *
+     * @param  String  expected  selector expression
+     * @param  String  message   Test description
+     * @return Object            An assertion result object
+     */
+    this.assertNotVisible = this.assertInvisible = function assertNotVisible(selector, message) {
+        return this.assert(!casper.visible(selector), message, {
+            type: "assertVisible",
+            standard: "Selector is not visible",
+            values: {
+                selector: selector
+            }
+        });
+    };
+
+    /**
      * Asserts that the provided function called with the given parameters
      * will raise an exception.
      *

@@ -15,5 +15,6 @@
         </ul>
         <input type="text" name="dummy_name" value="dummy_value" />
         <h1>Title</h1>
+        <p id="hidden" style="display:none">I'm hidden.</p>
     </body>
 </html>

@@ -113,6 +113,12 @@ casper.then(function() {
 
     t.comment('Tester.assertUrlMatch()');
     t.assertUrlMatch(/index\.html$/, "Tester.assertUrlMatch() works as expected");
+
+    t.comment('Tester.assertVisible()');
+    t.assertVisible('img', 'Tester.assertVisible() works as expected');
+
+    t.comment('Tester.assertNotVisible()');
+    t.assertNotVisible('p#hidden', 'Tester.assertNotVisible() works as expected');
 });
 
 casper.then(function() {