Introduce Hypothesis for testing (#191)

CHANGES.rst

@@ -15,8 +15,8 @@ New features:
 
 Bug fixes:
 
-- *add item here*
-
+- Don't split content lines on the unicode ``LINE SEPARATOR`` character
+  ``\u2028`` but only on ``CRLF`` or ``LF``.
 
 3.11.2 (2017-01-12)
 -------------------

setup.cfg

@@ -10,3 +10,6 @@ create-wheel = yes
 
 [wheel]
 universal = 1
+
+[tool:pytest]
+norecursedirs = .* env* docs *.egg src/icalendar/tests/hypothesis

src/icalendar/parser.py

@@ -380,7 +380,7 @@ class Contentlines(list):
             # a fold is carriage return followed by either a space or a tab
             unfolded = uFOLD.sub('', st)
             lines = cls(Contentline(line) for
-                        line in unfolded.splitlines() if line)
+                        line in NEWLINE.split(unfolded) if line)
             lines.append('')  # '\r\n' at the end of every content line
             return lines
         except:

src/icalendar/tests/hypothesis/test_fuzzing.py

@@ -0,0 +1,35 @@
+import string
+
+from hypothesis import given, settings
+import hypothesis.strategies as st
+
+from icalendar.parser import Contentline, Contentlines, Parameters
+from icalendar.tests import unittest
+
+
+def printable_characters(**kw):
+    return st.text(
+        st.characters(blacklist_categories=(
+            'Cc', 'Cs'
+        ), **kw)
+    )
+
+key = st.text(string.ascii_letters + string.digits, min_size=1)
+value = printable_characters(blacklist_characters=u'\\;:\"')
+
+
+class TestFuzzing(unittest.TestCase):
+
+    @given(lines=st.lists(
+        st.tuples(key, st.dictionaries(key, value), value),
+        min_size=1
+    ))
+    @settings(max_examples=10**9)
+    def test_main(self, lines):
+        cl = Contentlines()
+        for key, params, value in lines:
+            params = Parameters(**params)
+            cl.append(Contentline.from_parts(key, params, value))
+        cl.append('')
+
+        assert Contentlines.from_ical(cl.to_ical()) == cl

tox.ini

@@ -6,8 +6,10 @@ envlist = py26,py27,py33,py34,py35,py36
 deps =
     pytest
     coverage
+    py{27,33,34,35,36}: hypothesis>=3.0
     icalendar [test]
 commands =
-    coverage run --source=src/icalendar --omit=*/tests/* --module pytest [] src/icalendar
+    coverage run --source=src/icalendar --omit=*/tests/* --module pytest []
+    py{27,33,34,35,36}: coverage run --append --source=src/icalendar --omit=*/tests/* --module pytest [] src/icalendar/tests/hypothesis/
     coverage report
     coverage html