Add a few more edge cases for prompt numbers in nbconvert

IPython/nbconvert/exporters/tests/files/notebook2.ipynb

@@ -178,6 +178,24 b''
      "metadata": {},
      "outputs": [],
      "prompt_number": null
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 0
     }
    ],
    "metadata": {}

IPython/nbconvert/exporters/tests/test_html.py

@@ -69,7 +69,7 b' class TestHTMLExporter(ExportersTestsBase):'
         in_regex = r"In \[(.*)\]:"
         out_regex = r"Out\[(.*)\]:"
 
-        ins = ["1", "2", "6", "7", "8", "10", "14", " ", " "]
+        ins = ["1", "2", "6", "7", "8", "10", "14", " ", " ", "*", "0"]
         outs = ["7", "10", "14"]
 
         assert re.findall(in_regex, output) == ins

IPython/nbconvert/exporters/tests/test_latex.py

@@ -110,7 +110,7 b' class TestLatexExporter(ExportersTestsBase):'
         in_regex = r"In \[\{\\color\{incolor\}(.*)\}\]:"
         out_regex = r"Out\[\{\\color\{outcolor\}(.*)\}\]:"
 
-        ins = ["1", "2", "6", "7", "8", "10", "14", " ", " "]
+        ins = ["1", "2", "6", "7", "8", "10", "14", " ", " ", "*", "0"]
         outs = ["7", "10", "14"]
 
         assert re.findall(in_regex, output) == ins