Add more kernel message buffer tests.

Author: jasongrout

notebook/tests/notebook/buffering.js

@@ -2,10 +2,17 @@
 // Test buffering for execution requests.
 //
 casper.notebook_test(function () {
-    this.evaluate(function () {
+    this.then(function() {
+      // make sure there are at least three cells for the tests below.
+      this.append_cell();
+      this.append_cell();
+      this.append_cell();
+    })
+
+    this.thenEvaluate(function () {
+        IPython.notebook.kernel.stop_channels();
         var cell = IPython.notebook.get_cell(0);
         cell.set_text('a=10; print(a)');
-        IPython.notebook.kernel.stop_channels();
         IPython.notebook.execute_cells([0]);
         IPython.notebook.kernel.reconnect(1);
     });
@@ -14,23 +21,36 @@ casper.notebook_test(function () {
 
     this.then(function () {
         var result = this.get_output_cell(0);
-        this.test.assertEquals(result.text, '10\n', 'kernels buffer execution requests if connection is down');
+        this.test.assertEquals(result.text, '10\n', 'kernels buffer messages if connection is down');
     });
-    
+
     this.thenEvaluate(function () {
         var cell = IPython.notebook.get_cell(0);
-        cell.set_text('a=11; print(a)');
-        cell.kernel = null;
-        IPython.notebook.kernel = null;
+        var cellplus = IPython.notebook.get_cell(1);
+        var cellprint = IPython.notebook.get_cell(2);
+        cell.set_text('k=1');
+        cellplus.set_text('k+=1');
+        cellprint.set_text('k*=2')
+
+        IPython.notebook.kernel.stop_channels();
+
+        // Repeated execution of cell queued up in the kernel executes
+        // each execution request in order.
         IPython.notebook.execute_cells([0]);
-        IPython.notebook._session_started();
+        IPython.notebook.execute_cells([2]);
+        IPython.notebook.execute_cells([1]);
+        IPython.notebook.execute_cells([1]);
+        IPython.notebook.execute_cells([1]);
+        cellprint.set_text('print(k)')
+        IPython.notebook.execute_cells([2]);
+
+        IPython.notebook.kernel.reconnect(1);
     });
 
-    this.wait_for_output(0);
+    this.wait_for_output(2);
 
     this.then(function () {
-        var result = this.get_output_cell(0);
-        this.test.assertEquals(result.text, '11\n', 'notebooks buffer cell execution requests if kernel is not set');
+        var result = this.get_output_cell(2);
+        this.test.assertEquals(result.text, '5\n', 'kernels send buffered messages in order');
     });
-    
 });