Use Python 3 compatible syntax in tests

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

@@ -4,7 +4,7 b''
 casper.notebook_test(function () {
     this.evaluate(function () {
         var cell = IPython.notebook.get_cell(0);
-        cell.set_text('a=10; print a');
+        cell.set_text('a=10; print(a)');
         cell.execute();
     });
 

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

@@ -10,7 +10,7 b' casper.notebook_test(function() {'
             
             IPython.notebook.insert_cell_below('code');
             var cell_two = IPython.notebook.get_selected_cell();
-            cell_two.set_text('print a');
+            cell_two.set_text('print(a)');
         };
         
         // merge_cell_above()
@@ -30,8 +30,8 b' casper.notebook_test(function() {'
         };
     });
     
-    this.test.assertEquals(output.above, 'a = 5\nprint a',
+    this.test.assertEquals(output.above, 'a = 5\nprint(a)',
                            'Successful insert_cell_above().');
-    this.test.assertEquals(output.below, 'a = 5\nprint a',
+    this.test.assertEquals(output.below, 'a = 5\nprint(a)',
                            'Successful insert_cell_below().');
 });