test rst export with empty code cells

IPython/nbconvert/exporters/tests/test_rst.py

@@ -1,42 +1,65 b''
 """Tests for RSTExporter"""
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
+import io
+
+from IPython.nbformat import current
+
 from .base import ExportersTestsBase
 from ..rst import RSTExporter
 from IPython.testing.decorators import onlyif_cmds_exist
 
 #-----------------------------------------------------------------------------
 # Class
 #-----------------------------------------------------------------------------
 
 class TestRSTExporter(ExportersTestsBase):
     """Tests for RSTExporter"""
 
     exporter_class = RSTExporter
     should_include_raw = ['rst']
 
     def test_constructor(self):
         """
         Can a RSTExporter be constructed?
         """
         RSTExporter()
 
 
     @onlyif_cmds_exist('pandoc')
     def test_export(self):
         """
         Can a RSTExporter export something?
         """
         (output, resources) = RSTExporter().from_filename(self._get_notebook())
         assert len(output) > 0
+        
+    @onlyif_cmds_exist('pandoc')
+    def test_empty_code_cell(self):
+        """No empty code cells in rst"""
+        nbname = self._get_notebook()
+        with io.open(nbname, encoding='utf8') as f:
+            nb = current.read(f, 'json')
+        
+        exporter = self.exporter_class()
+        
+        (output, resources) = exporter.from_notebook_node(nb)
+        # add an empty code cell
+        nb.worksheets[0].cells.append(
+            current.new_code_cell(input="")
+        )
+        (output2, resources) = exporter.from_notebook_node(nb)
+        # adding an empty code cell shouldn't change output
+        self.assertEqual(output.strip(), output2.strip())
+