make the JS test fail

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

@@ -1,23 +1,23 b''
 //
 // Test robustness about JS injection in different place
 //
 // This assume malicious document arrive to the frontend.
 //
 
 casper.notebook_test(function () {
     var messages = [];
     this.on('remote.alert', function (msg) {
         messages.push(msg);
     });
     
     this.evaluate(function () {
         var cell = IPython.notebook.get_cell(0);
-        var json = cell.toJSON()
-        json.prompt_number = "<script> alert('hello from input prompts !')</script>"
-        cell.fromJSON(j)
+        var json = cell.toJSON();
+        json.prompt_number = "<script> alert('hello from input prompts !')</script>";
+        cell.fromJSON(json);
     });
 
     this.then(function () {
         this.test.assert(messages.length == 0, "Captured log message from script tag injection !");
     });
 });