Mock the response from the snuggletex server, and unskip the SymbolicResponse test.

common/lib/capa/capa/tests/test_responsetypes.py

@@ -10,6 +10,7 @@ import os
 import random
 import unittest
 import textwrap
+import mock
 
 from . import test_system
 
@@ -186,7 +187,6 @@ class ImageResponseTest(ResponseTest):
 
 class SymbolicResponseTest(unittest.TestCase):
     def test_sr_grade(self):
-        raise SkipTest()  # This test fails due to dependencies on a local copy of snuggletex-webapp. Until we have figured that out, we'll just skip this test
         symbolicresponse_file = os.path.dirname(__file__) + "/test_files/symbolicresponse.xml"
         test_lcp = lcp.LoncapaProblem(open(symbolicresponse_file).read(), '1', system=test_system)
         correct_answers = {'1_2_1': 'cos(theta)*[[1,0],[0,1]] + i*sin(theta)*[[0,1],[1,0]]',
@@ -270,7 +270,18 @@ class SymbolicResponseTest(unittest.TestCase):
                             </mstyle>
                             </math>''',
                         }
+
+        import requests
+        d = os.path.dirname(__file__)
+        correct_snuggletex_response = open(os.path.join(d, "test_files/snuggletex_correct.html")).read().decode('utf8')
+        wrong_snuggletex_response = open(os.path.join(d, "test_files/snuggletex_wrong.html")).read().decode('utf8')
+
+        with mock.patch.object(requests, 'post') as mock_post:
+            mock_post.return_value.text = correct_snuggletex_response
             self.assertEquals(test_lcp.grade_answers(correct_answers).get_correctness('1_2_1'), 'correct')
+
+        with mock.patch.object(requests, 'post') as mock_post:
+            mock_post.return_value.text = wrong_snuggletex_response
             self.assertEquals(test_lcp.grade_answers(wrong_answers).get_correctness('1_2_1'), 'incorrect')