Test ignore_weekends clause in Importance

Also introduce freezegun.freeze_time decorator.

setup.py

@@ -37,7 +37,7 @@ setup(
         ':python_version=="2.7"': ['ushlex'],
         'ical': ['icalendar'],
         'prompt-toolkit': ['prompt-toolkit >= 0.53'],
-        'test': ['green', 'coverage'],
+        'test': ['freezegun', 'coverage', 'green'],
         'test:python_version=="2.7"': ['mock'],
         'test:python_version!="3.2"': ['pylint'],
     },

test/test_importance.py

@@ -16,6 +16,7 @@
 
 import unittest
 from datetime import date, timedelta
+from freezegun import freeze_time
 
 from test.topydo_testcase import TopydoTest
 from topydo.lib.Config import config
@@ -23,35 +24,37 @@ from topydo.lib.Importance import importance
 from topydo.lib.Todo import Todo
 
 
+@freeze_time("2015, 11, 06")
 class ImportanceTest(TopydoTest):
-    def test_importance1(self):
+    def test_importance01(self):
         todo = Todo("Foo")
         self.assertEqual(importance(todo), 2)
 
-    def test_importance2(self):
+    def test_importance02(self):
         todo = Todo("(A) Foo")
         self.assertEqual(importance(todo), 5)
 
-    def test_importance3(self):
+    def test_importance03(self):
         todo = Todo("(A) Foo " + config().tag_star() + ":1")
         self.assertEqual(importance(todo), 6)
 
-    def test_importance4(self):
+    def test_importance04(self):
         today_str = date.today().isoformat()
         todo = Todo("(C) Foo " + config().tag_due() + ":" + today_str)
         self.assertEqual(importance(todo), 8)
 
-    def test_importance5(self):
-        due = date.today() + timedelta(8)
-        due_str = due.isoformat()
-        todo = Todo("(C) Foo " + config().tag_due() + ":" + due_str)
+    def test_importance05(self):
+        todo = Todo("(C) Foo " + config().tag_due() + ":" + "2015-11-14")
         self.assertEqual(importance(todo), 4)
 
-    def test_importance6(self):
-        due = date.today() + timedelta(4)
-        due_str = due.isoformat()
-        todo = Todo("(C) Foo " + config().tag_due() + ":" + due_str)
+    def test_importance06(self):
+        todo = Todo("(C) Foo " + config().tag_due() + ":" + "2015-11-10")
         self.assertEqual(importance(todo), 5)
 
+    def test_importance07(self):
+        config(p_overrides={('sort', 'ignore_weekends'): '1'})
+        todo = Todo("(C) Foo " + config().tag_due() + ":" + "2015-11-09")
+        self.assertEqual(importance(todo), 6)
+
 if __name__ == '__main__':
     unittest.main()