Fixes normalization of microseconds in durations

Author: sdispater

pendulum/interval.py

@@ -60,7 +60,7 @@ def __new__(cls, days=0, seconds=0, microseconds=0,
         if total < 0:
             m = -1
 
-        self._microseconds = abs(round(total % 1 * 1e6)) * m
+        self._microseconds = round(total % m * 1e6)
         self._seconds = abs(int(total)) % SECONDS_PER_DAY * m
         self._days = abs(int(total)) // SECONDS_PER_DAY * m
 

tests/pendulum_tests/test_diff.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 
+import pendulum
+
 from datetime import datetime
 from contextlib import contextmanager
 from pendulum import Pendulum
@@ -593,3 +595,13 @@ def test_subtraction(self):
 
         self.assertEqual(3600, (future - d).total_seconds())
         self.assertEqual(3600, (future_dt - d).total_seconds())
+
+    def test_normalization(self):
+        d1 = pendulum.create(2012, 1, 1, 1, 2, 3, 123456)
+        d2 = pendulum.create(2011, 12, 31, 22, 2, 3)
+        delta = d2 - d1
+
+        assert delta.days == 0
+        assert delta.seconds == -10800
+        assert delta.microseconds == -123456
+        assert d1 + delta == d2