Fix eafc8cb070: highlight tests should now pass a cell object

IPython/nbconvert/filters/highlight.py

@@ -95,4 +95,4 b" def _pygment_highlight(cell, output_formatter, language='ipython'):"
     else:
         lexer = get_lexer_by_name(language, stripall=True)
 
-    return pygements_highlight(cell, lexer, output_formatter)
+    return pygements_highlight(cell['input'], lexer, output_formatter)

IPython/nbconvert/filters/tests/test_highlight.py

@@ -60,6 +60,6 b' class TestHighlight(TestsBase):'
 
     def _try_highlight(self, method, test, tokens):
         """Try highlighting source, look for key tokens"""
-        results = method(test)
+        results = method({'input': test})
         for token in tokens:
             assert token in results