diff --git a/pyfolio/tests/test_timeseries.py b/pyfolio/tests/test_timeseries.py
index <HASH>..<HASH> 100644
--- a/pyfolio/tests/test_timeseries.py
+++ b/pyfolio/tests/test_timeseries.py
@@ -303,15 +303,14 @@ class TestStats(TestCase):
             expected)
 
     @parameterized.expand([
-        (-simple_rets[:5], 'calendar', -458003439.10738045),
-        (-simple_rets[:5], 'arithmetic', -723163324.90639055)
+        (-simple_rets[:5], -12.29634091915152),
+        (-simple_rets, -1.2296340919151518),
+        (simple_rets, np.inf)
     ])
-    def test_sortino(self, returns, returns_style, expected):
-        self.assertEqual(
-            timeseries.sortino_ratio(
-                returns,
-                returns_style=returns_style),
-            expected)
+    def test_sortino(self, returns, expected):
+        self.assertAlmostEqual(
+            timeseries.sortino_ratio(returns),
+            expected, DECIMAL_PLACES)
 
 
 class TestMultifactor(TestCase):
TST Fix sortino ratio tests

This changes the tests for the sortino ratio.
It tests 3 cases

1. -simple_rets[:5], five  negative elements
2. -simple_rets, entire array where elements[5:] are 0.
    this should have a higher sortino than the first case
3. simple_rets, all elements are >= 0, so infinity is the correct answer.