Add unit test for ConvertRST.render_heading method

Conflicts:

	tests/test_simple.py

tests/test_simple.py

@@ -3,6 +3,7 b' import nose.tools as nt'
 
 import os
 import glob
+from IPython.nbformat import current as nbformat
 
 fname = 'tests/test.ipynb'
 out_fname = 'tests/test.rst'
@@ -13,14 +14,12 b' def clean_dir():'
     map(os.remove, glob.glob("./tests/*.rst"))
     map(os.remove, glob.glob("./tests/*.png"))
 
-
 @nt.with_setup(clean_dir, clean_dir)
 def test_simple():
     c = ConverterRST(fname)
     f = c.render()
     nt.assert_true('rst' in f, 'changed file extension to rst')
 
-
 @nt.with_setup(clean_dir, clean_dir)
 def test_main():
     """
@@ -28,3 +27,31 b' def test_main():'
     """
     main(fname)
     nt.assert_true(os.path.exists(out_fname))
+
+def test_render_heading():
+    """ Unit test for cell type "heading" """
+    # Generate and test heading cells level 1-6
+    for level in xrange(1,7):
+        cell = {
+            'cell_type': 'heading',
+            'level'    : level,
+            'source'   :  ['Test for heading type H{0}'.format(level)] 
+            }
+        # Convert cell dictionaries to NotebookNode
+        cell_nb = nbformat.NotebookNode(cell)
+        # Make sure "source" attribute is uniconde not list.
+        # For some reason, creating a NotebookNode manually like
+        # this isn't converting source to a string like using
+        # the create-from-file routine.
+        if type(cell_nb.source) is list:
+            cell_nb.source = '\n'.join(cell_nb.source)
+        # Render to rst
+        c = ConverterRST('')
+        rst_list = c.render_heading(cell_nb)
+        nt.assert_is_instance(rst_list,list) # render should return a list
+        rst_str = "".join(rst_list)
+        # Confirm rst content
+        heading_level = {1:'=', 2:'-', 3:'`', 4:'\'', 5:'.',6:'~'}
+        chk_str = "Test for heading type H{0}\n{1}\n".format(
+             level,heading_level[level]*24)
+        nt.assert_equal(rst_str,chk_str)