Update LPiCal.to_ical.

* lps_gen.py (LPiCal.to_ical): Use format for formatted string.
* tests/test_lps_gen.py (TestLPiCal.test_to_ical): Update test.

2 files changed, 5 insertions, 2 deletions

diff --git a/lps_gen.py b/lps_gen.py
index 6c2bf8e..bd410c1 100644
--- a/lps_gen.py
+++ b/lps_gen.py
@@ -267,7 +267,7 @@ class LPiCal(object):
     def to_ical(self):
         """Writes iCal to disk.
         """
-        filename = 'lp%s-schedule.ics' % self.lp_year
+        filename = 'lp{}-schedule.ics'.format(self.lp_year)
         write_file(filename, self.gen_ical())
 
         return filename
diff --git a/tests/test_lps_gen.py b/tests/test_lps_gen.py
index 41f6803..829248e 100644
--- a/tests/test_lps_gen.py
+++ b/tests/test_lps_gen.py
@@ -331,7 +331,10 @@ class TestLPiCal(object):
     def test_to_ical(self):
         """Testing LPiCal.to_ical.
         """
-        self.purge_list.append(self.lp_ical.to_ical())
+        filename = self.lp_ical.to_ical()
+        assert_equal(filename, 'lp2019-schedule.ics')
+
+        self.purge_list.append(filename)
 
 
     @classmethod