minimal notebook rountrip test

IPython/html/tests/casperjs/test_cases/nb_roundtrip.js

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+// Test opening a rich notebook, saving it, and reopening it again.
+//
+//toJSON fromJSON toJSON and do a string comparison
+casper.notebook_test(function () {
+    this.evaluate(function () {
+        var cell = IPython.notebook.get_cell(0);
+        // "we have to make messes to find out who we are"
+        cell.set_text([
+            "%%javascript",
+            "IPython.notebook.insert_cell_above('code')"
+            ].join('\n')
+            );
+
+        cell.execute();
+    });
+    
+    this.wait_for_output(0);
+
+    this.then(function ( ) {
+        var result = this.get_output_cell(1);
+        var num_cells = this.get_cells_length();
+        this.test.assertEquals(num_cells, 2, '%%javascript magic works');
+        this.test.assertTrue(result.hasOwnProperty('application/javascript'), 'JS embeded with mime key');
+    });
+
+
+    //this.thenEvaluate(function () { var cell = IPython.notebook.get_cell(0);
+
+    //    // we have to make messes to find out who we are
+    //    cell.set_text([
+    //        "import IPython.html.tests as t",
+    //        "t.write_test_notebook('rich_output.ipynb')"
+    //        ].join('\n')
+    //        );
+
+    //    cell.execute();
+    //});
+    //
+    //this.wait_for_output(0);
+
+    //this.then(function ( ) {
+    //    var result = this.get_output_cell(0);
+    //    var num_cells = this.get_cells_length();
+    //    this.test.assertEquals(result.text, '10\n', 'opening notebook JSON');
+    //    this.test.assertEquals(num_cells, 2, '              %%javascript magic works')
+    //});
+
+});