add test with examples

see collective#356 (comment)

src/icalendar/tests/issue_355_url_unescaping.ics

@@ -0,0 +1,33 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//ical.marudot.com//iCal Event Maker
+CALSCALE:GREGORIAN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+LAST-MODIFIED:20201011T015911Z
+TZURL:http://tzurl.org/zoneinfo-outlook/Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZNAME:CEST
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZNAME:CET
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTAMP:20220822T164528Z
+UID:[email protected]
+DTSTART;TZID=Europe/Berlin:20220822T120000
+DTEND;TZID=Europe/Berlin:20220822T120000
+SUMMARY:test
+DESCRIPTION:https://www.facebook.com/events/756119502186737/?acontext=%7B%22source%22%3A5%2C%22action_history%22%3A[%7B%22surface%22%3A%22page%22%2C%22mechanism%22%3A%22main_list%22%2C%22extra_data%22%3A%22%5C%22[]%5C%22%22%7D]%2C%22has_source%22%3Atrue%7D
+END:VEVENT
+END:VCALENDAR

src/icalendar/tests/test_fixed_issues.py

@@ -6,6 +6,8 @@
 import os
 import pytz
 
+HERE = os.path.dirname(__file__)
+
 
 class TestIssues(unittest.TestCase):
 
@@ -14,8 +16,7 @@ def test_issue_53(self):
         https://github.com/collective/icalendar/issues/53
         """
 
-        directory = os.path.dirname(__file__)
-        ics = open(os.path.join(directory, 'issue_53_parsing_failure.ics'),
+        ics = open(os.path.join(HERE, 'issue_53_parsing_failure.ics'),
                    'rb')
         cal = icalendar.Calendar.from_ical(ics.read())
         ics.close()
@@ -231,8 +232,7 @@ def test_issue_112(self):
         """Issue #112 - No timezone info on EXDATE
         https://github.com/collective/icalendar/issues/112
         """
-        directory = os.path.dirname(__file__)
-        path = os.path.join(directory,
+        path = os.path.join(HERE,
                             'issue_112_missing_tzinfo_on_exdate.ics')
         with open(path, 'rb') as ics:
             cal = icalendar.Calendar.from_ical(ics.read())
@@ -432,6 +432,18 @@ def test_issue_184(self):
                          b'END:VEVENT\r\n'
                          )
 
+    def test_issue_356_url_escaping(self):
+        """Test that the URLs stay intact.
+
+        see https://github.com/collective/icalendar/pull/356
+        see https://github.com/collective/icalendar/issues/355
+        """
+        ics = open(os.path.join(HERE, 'issue_53_parsing_failure.ics'), 'rb')
+        cal = icalendar.Calendar.from_ical(ics)
+        event = cal.walk(name='VEVENT')[0]
+        URL = "https://www.facebook.com/events/756119502186737/?acontext=%7B%22source%22%3A5%2C%22action_history%22%3A[%7B%22surface%22%3A%22page%22%2C%22mechanism%22%3A%22main_list%22%2C%22extra_data%22%3A%22%5C%22[]%5C%22%22%7D]%2C%22has_source%22%3Atrue%7D"
+        self.assertEqual(event["DESCRIPTION"], URL)
+
     def test_issue_237(self):
         """Issue #237 - Fail to parse timezone with non-ascii TZID"""