add tests for cell_type preserving insertion

IPython/html/tests/notebook/dualmode_cellinsert.js

@@ -18,10 +18,25 casper.notebook_test(function () {
         this.select_cell(2);
         this.trigger_keydown('a'); // Creates one cell
         this.test.assertEquals(this.get_cell_text(2), '', 'a; New cell 2 text is empty');
+        this.test.assertEquals(this.get_cell(2).cell_type, 'code', 'a; inserts a code cell when on code cell');
         this.validate_notebook_state('a', 'command', 2);
         this.trigger_keydown('b'); // Creates one cell
         this.test.assertEquals(this.get_cell_text(2), '', 'b; Cell 2 text is still empty');
         this.test.assertEquals(this.get_cell_text(3), '', 'b; New cell 3 text is empty');
+        this.test.assertEquals(this.get_cell(3).cell_type, 'code', 'b; inserts a code cell when on code cell');
         this.validate_notebook_state('b', 'command', 3);
     });
-});
  No newline at end of file
+    this.then(function () {
+        // Cell insertion
+        this.select_cell(2);
+        this.trigger_keydown('m'); // switch it to markdown for the next test
+        this.trigger_keydown('a'); // Creates one cell
+        this.test.assertEquals(this.get_cell_text(2), '', 'a; New cell 2 text is empty');
+        this.test.assertEquals(this.get_cell(2).cell_type, 'markdown', 'a; inserts a markdown cell when on markdown cell');
+        this.validate_notebook_state('a', 'command', 2);
+        this.trigger_keydown('b'); // Creates one cell
+        this.test.assertEquals(this.get_cell_text(2), '', 'b; Cell 2 text is still empty');
+        this.test.assertEquals(this.get_cell(3).cell_type, 'markdown', 'b; inserts a markdown cell when on markdown cell');
+        this.validate_notebook_state('b', 'command', 3);
+    });
+});

IPython/html/tests/util.js

@@ -167,8 +167,6 casper.get_cell_text = function(index){
 casper.insert_cell_at_bottom = function(cell_type){
     // Inserts a cell at the bottom of the notebook
     // Returns the new cell's index.
-    cell_type = cell_type || 'code';
-
     return this.evaluate(function (cell_type) {
         var cell = IPython.notebook.insert_cell_at_bottom(cell_type);
         return IPython.notebook.find_cell_index(cell);