fix: handle holiday change

fix #14

tests/test_fetch_holidays.py

@@ -2,11 +2,23 @@
 import json
 import sys
 
-from fetch_holidays import CustomJSONEncoder, DescriptionParser
+from fetch_holidays import CustomJSONEncoder, DescriptionParser, get_paper_urls, get_rules, get_paper
 
 from .filetools import _file_path
 
 
+def test_get_paper_urls():
+    assert get_paper_urls(2019) == [
+        'http://www.gov.cn/zhengce/content/2019-03/22/content_5375877.htm',
+        'http://www.gov.cn/zhengce/content/2018-12/06/content_5346276.htm'
+    ]
+
+
+def test_get_patch_rules():
+    assert(list(get_rules(get_paper('http://www.gov.cn/zhengce/content/2019-03/22/content_5375877.htm')))
+           == [('劳动节', '2019年5月1日至4日放假调休，共4天。4月28日（星期日）、5月5日（星期日）上班。')])
+
+
 def _normalize(iterable):
     return sorted(json.loads(json.dumps(list(iterable), cls=CustomJSONEncoder)),
                   key=lambda x: x['date'])