diff --git a/tests/test_pyfacts.py b/tests/test_pyfacts.py
index aab530a..2d04b36 100644
--- a/tests/test_pyfacts.py
+++ b/tests/test_pyfacts.py
@@ -30,7 +30,7 @@ class TestDateSeries:
     def test_monthly(self):
         start_date = datetime.datetime(2020, 1, 1)
         end_date = datetime.datetime(2020, 12, 31)
-        d = create_date_series(start_date, end_date, frequency="M")
+        d = create_date_series(start_date, end_date, frequency="M", ensure_coverage=False)
         assert len(d) == 12
 
         d = create_date_series(start_date, end_date, frequency="M", eomonth=True)
@@ -327,7 +327,7 @@ class TestExpand:
         ts_data = create_test_data(AllFrequencies.M, num=6)
         ts = TimeSeries(ts_data, "M")
         expanded_ts = ts.expand("W", "ffill")
-        assert len(expanded_ts) == 22
+        assert len(expanded_ts) == 23
         assert expanded_ts.frequency.name == "weekly"
         assert expanded_ts.iloc[0][1] == expanded_ts.iloc[1][1]
 
@@ -346,7 +346,7 @@ class TestShrink:
         ts = TimeSeries(ts_data, "D")
         shrunk_ts_w = ts.shrink("W", "ffill")
         shrunk_ts_m = ts.shrink("M", "ffill")
-        assert len(shrunk_ts_w) == 143
+        assert len(shrunk_ts_w) == 144
         assert len(shrunk_ts_m) == 34
 
     def test_weekly_to_smaller(self, create_test_data):
@@ -376,7 +376,7 @@ class TestTransform:
         ts = TimeSeries(ts_data, "D")
         tst = ts.transform("W", "mean")
         assert isinstance(tst, TimeSeries)
-        assert len(tst) == 156
+        assert len(tst) == 157
         assert "2017-01-30" in tst
         assert tst.iloc[4] == (datetime.datetime(2017, 1, 30), 1021.19)