upstream/ipython Files · IPython/html/tests/notebook/empty_arrow_keys.js

Handle kernel messages synchronously...

Handle kernel messages synchronously A problem can happen when two messages come in for different comms, where the second depends on the first (for example, the first might be a message setting the state of a widget, and the second triggering a view creation for the widget). Since comm message queues are independent of each other, the second message could be executed before the first message. This exposes a more fundamental assumption users are likely to have that messages from python are processed synchronously. Thanks to @dmadeka for reporting an error that led to discovering this issue.

Jonathan Frederic - - Load All Authors

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             empty_arrow_keys.js
        
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      //

      // Check for errors with up and down arrow presses in an empty notebook.

      //

      casper.notebook_test(function () {

          var result = this.evaluate(function() {

              var ncells = IPython.notebook.ncells();

              var i;

              // Delete all cells.

              for (i = 0; i < ncells; i++) {

                  IPython.notebook.delete_cell();

              }

              return true;

          });

          // Simulate the "up arrow" and "down arrow" keys.

          this.trigger_keydown('up');

          this.trigger_keydown('down');

          this.test.assertTrue(result, 'Up/down arrow okay in empty notebook.');

      });

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				//
				// Check for errors with up and down arrow presses in an empty notebook.
				//
				casper.notebook_test(function () {
				var result = this.evaluate(function() {
				var ncells = IPython.notebook.ncells();
				var i;

				// Delete all cells.
				for (i = 0; i < ncells; i++) {
				IPython.notebook.delete_cell();
				}

				return true;
				});

				// Simulate the "up arrow" and "down arrow" keys.
				this.trigger_keydown('up');
				this.trigger_keydown('down');
				this.test.assertTrue(result, 'Up/down arrow okay in empty notebook.');
				});