Penyempurnaan round_up()

CHANGES.txt

+0.2 2022-02-09
+----------------
+- round_up() disempurnakan yaitu bila pecahan kurang dari 0.1 maka akan
+  dibulatkan ke bawah. Ini terkait masalah operasi bilangan pecahan yang
+  disebutkan di 
+  https://stackoverflow.com/questions/588004/is-floating-point-math-broken
+- Penggunaan pkgutil agar lebih fleksibel saat pip install -e
+
 0.1.8 2020-10-17
 ----------------
 - Baru, STAN (System Trace Audit Number) generator

opensipkd/__init__.py

+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

opensipkd/hitung.py

@@ -6,11 +6,10 @@ from datetime import (
 
 def round_up(n):
     i = int(n)
-    if n == i:
-        return i
-    if n > 0:
-        return i + 1
-    return i - 1
+    plus = (int(n*10) - int(n)*10) and 1
+    if n < 0:
+        return i - plus
+    return i + plus
 
 
 def bulan_tunggakan_berdasarkan_tgl(jatuh_tempo, tgl_hitung):

test/denda.py

@@ -3,6 +3,7 @@ from datetime import date
 from opensipkd.hitung import (
     bulan_tunggakan_berdasarkan_tgl as by_date,
     bulan_tunggakan_berdasarkan_bln as by_month,
+    round_up,
     )
 
 
@@ -42,5 +43,28 @@ class Denda(unittest.TestCase):
         self.bandingkan(tgl_bayar, 4)
 
 
+class Round(unittest.TestCase):
+    def test_round_0(self):
+        self.assertEqual(round_up(0), 0)
+
+    def test_round_5(self):
+        self.assertEqual(round_up(5), 5)
+
+    def test_round_5_1(self):
+        self.assertEqual(round_up(5.1), 6)
+
+    def test_round_5_09(self):
+        self.assertEqual(round_up(5.09), 5)
+
+    def test_round_minus_5(self):
+        self.assertEqual(round_up(-5), -5)
+
+    def test_round_minus_5_1(self):
+        self.assertEqual(round_up(-5.1), -6)
+
+    def test_round_minus_5_09(self):
+        self.assertEqual(round_up(-5.09), -5)
+
+
 if __name__ == '__main__':
     unittest.main()