Add regression test for latex color prompts

IPython/nbconvert/exporters/tests/test_latex.py

@@ -1,101 +1,117 b''
 """Tests for Latex exporter"""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import os.path
 import textwrap
+import re
 
 from .base import ExportersTestsBase
 from ..latex import LatexExporter
 from IPython.nbformat import current
 from IPython.testing.decorators import onlyif_cmds_exist
 from IPython.utils.tempdir import TemporaryDirectory
 
 
 class TestLatexExporter(ExportersTestsBase):
     """Contains test functions for latex.py"""
 
     exporter_class = LatexExporter
     should_include_raw = ['latex']
 
     def test_constructor(self):
         """
         Can a LatexExporter be constructed?
         """
         LatexExporter()
 
 
     @onlyif_cmds_exist('pandoc')
     def test_export(self):
         """
         Can a LatexExporter export something?
         """
         (output, resources) = LatexExporter().from_filename(self._get_notebook())
         assert len(output) > 0
 
 
     @onlyif_cmds_exist('pandoc')
     def test_export_book(self):
         """
         Can a LatexExporter export using 'report' template?
         """
         (output, resources) = LatexExporter(template_file='report').from_filename(self._get_notebook())
         assert len(output) > 0
 
 
     @onlyif_cmds_exist('pandoc')
     def test_export_basic(self):
         """
         Can a LatexExporter export using 'article' template?
         """
         (output, resources) = LatexExporter(template_file='article').from_filename(self._get_notebook())
         assert len(output) > 0
 
 
     @onlyif_cmds_exist('pandoc')
     def test_export_article(self):
         """
         Can a LatexExporter export using 'article' template?
         """
         (output, resources) = LatexExporter(template_file='article').from_filename(self._get_notebook())
         assert len(output) > 0
 
     @onlyif_cmds_exist('pandoc')
     def test_very_long_cells(self):
         """
         Torture test that long cells do not cause issues
         """
         lorem_ipsum_text = textwrap.dedent("""\
           Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec
           dignissim, ipsum non facilisis tempus, dui felis tincidunt metus,
           nec pulvinar neque odio eget risus. Nulla nisi lectus, cursus
           suscipit interdum at, ultrices sit amet orci. Mauris facilisis
           imperdiet elit, vitae scelerisque ipsum dignissim non. Integer
           consequat malesuada neque sit amet pulvinar. Curabitur pretium
           ut turpis eget aliquet. Maecenas sagittis lacus sed lectus
           volutpat, eu adipiscing purus pulvinar. Maecenas consequat
           luctus urna, eget cursus quam mollis a. Aliquam vitae ornare
           erat, non hendrerit urna. Sed eu diam nec massa egestas pharetra
           at nec tellus. Fusce feugiat lacus quis urna sollicitudin volutpat.
           Quisque at sapien non nibh feugiat tempus ac ultricies purus.
            """)
         lorem_ipsum_text = lorem_ipsum_text.replace("\n"," ") + "\n\n"
         large_lorem_ipsum_text = "".join([lorem_ipsum_text]*3000)
 
         notebook_name = "lorem_ipsum_long.ipynb"
         nb = current.new_notebook(
             worksheets=[
                 current.new_worksheet(cells=[
                     current.new_text_cell('markdown',source=large_lorem_ipsum_text)
                 ])
             ]
         )
 
         with TemporaryDirectory() as td:
             nbfile = os.path.join(td, notebook_name)
             with open(nbfile, 'w') as f:
                 current.write(nb, f, 'ipynb')
 
             (output, resources) = LatexExporter(template_file='article').from_filename(nbfile)            
             assert len(output) > 0
+
+    @onlyif_cmds_exist('pandoc')
+    def test_prompt_number_color(self):
+        """
+        Does LatexExporter properly format input and output prompts in color?
+        """
+        (output, resources) = LatexExporter().from_filename(self._get_notebook())
+        in_regex = r"In \[\{\\color\{incolor\}(.*)\}\]:"
+        out_regex = r"Out\[\{\\color\{outcolor\}(.*)\}\]:"
+
+        ins = ["1", "2", "6", "7", "8", "10", "14", " ", " "]
+        outs = ["7", "10", "14"]
+
+        assert re.findall(in_regex, output) == ins
+        assert re.findall(out_regex, output) == outs