Added test

IPython/html/tests/widgets/widget_int.js

@@ -154,4 +154,24 @@ casper.notebook_test(function () {
         this.test.assertEquals(this.get_output_cell(index).text, '50\n', 
             'Invalid int textbox characters ignored');
     });    
+
+    index = this.append_cell(
+        'a = widgets.IntSlider()\n' +
+        'display(a)\n' +
+        'a.max = -1\n' +
+        'print("Success")\n');
+    this.execute_cell_then(index, function(index){
+        this.test.assertEquals(this.get_output_cell(index).text, 'Success\n', 
+            'Invalid int range max bound does not cause crash.');
+    }); 
+
+    index = this.append_cell(
+        'a = widgets.IntSlider()\n' +
+        'display(a)\n' +
+        'a.min = 101\n' +
+        'print("Success")\n');
+    this.execute_cell_then(index, function(index){
+        this.test.assertEquals(this.get_output_cell(index).text, 'Success\n', 
+            'Invalid int range min bound does not cause crash.');
+    });
 });