hitung_denda() berdasarkan bulan

CHANGES.txt

+0.1.4 2019-11-11
+----------------
+- hitung_denda() kini bisa berdasarkan bulan.
+
 0.1.3 2019-07-05
 ----------------
 - Penambahan FixLength.to_dict()

opensipkd/hitung.py

@@ -13,20 +13,33 @@ def round_up(n):
     return i - 1
 
 
-def bulan_tunggakan(jatuh_tempo, tgl_hitung):
+def bulan_tunggakan_berdasarkan_tgl(jatuh_tempo, tgl_hitung):
     x = (tgl_hitung.year - jatuh_tempo.year) * 12
     y = tgl_hitung.month - jatuh_tempo.month
-    n = x + y + 1
-    if tgl_hitung.day <= jatuh_tempo.day:
-        n -= 1
-    if n < 1:
-        n = 0
+    n = x + y
+    if n < 0:
+        return 0
+    if tgl_hitung.day > jatuh_tempo.day:
+        n += 1
     if n > 24:
-        n = 24
+        return 24
     return n
 
 
-def hitung_denda(tagihan, jatuh_tempo, persen_denda, tgl_hitung=None):
+def bulan_tunggakan_berdasarkan_bln(jatuh_tempo, tgl_hitung):
+    x = (tgl_hitung.year - jatuh_tempo.year) * 12
+    y = tgl_hitung.month - jatuh_tempo.month
+    n = x + y
+    if n < 0:
+        return 0
+    if n > 24:
+        return 24
+    return n
+
+
+def hitung_denda(
+        tagihan, jatuh_tempo, persen_denda, tgl_hitung=None,
+        func_hitung_bulan=bulan_tunggakan_berdasarkan_tgl):
     if jatuh_tempo is None:
         return 0, 0
     if tgl_hitung is None:
@@ -35,6 +48,6 @@ def hitung_denda(tagihan, jatuh_tempo, persen_denda, tgl_hitung=None):
         jatuh_tempo = jatuh_tempo.date()
     if jatuh_tempo >= tgl_hitung or persen_denda <= 0:
         return 0, 0
-    bulan = bulan_tunggakan(jatuh_tempo, tgl_hitung)
+    bulan = func_hitung_bulan(jatuh_tempo, tgl_hitung)
     denda = bulan * float(persen_denda) / 100 * tagihan
     return bulan, denda

setup.py

 import os
-from setuptools import setup
+from setuptools import (
+    setup,
+    find_packages,
+    )
 
 
 here = os.path.abspath(os.path.dirname(__file__))
@@ -15,11 +18,6 @@ requires = [
     'pytz',
     ]
 
-packages = [
-    'opensipkd',
-    'opensipkd.string',
-    ]
-
 setup(
     name='opensipkd-hitung',
     version=version,
@@ -28,7 +26,7 @@ setup(
     author='Owo Sugiana',
     author_email='sugiana@gmail.com',
     license='PostgreSQL License',
-    packages=packages,
+    packages=find_packages(),
     install_requires=requires,
     zip_safe=False,
     )

test/denda.py

+import unittest
+from datetime import date
+from opensipkd.hitung import (
+    bulan_tunggakan_berdasarkan_tgl as by_date,
+    bulan_tunggakan_berdasarkan_bln as by_month,
+    )
+
+
+class Denda(unittest.TestCase):
+    def setUp(self):
+        self.jatuh_tempo = date(2019, 9, 20)
+
+    def by_date(self, tgl_bayar, jml_bln):
+        self.assertEqual(by_date(self.jatuh_tempo, tgl_bayar), jml_bln)
+
+    def by_month(self, tgl_bayar, jml_bln):
+        self.assertEqual(by_month(self.jatuh_tempo, tgl_bayar), jml_bln)
+
+    def bandingkan(self, tgl_bayar, jml_bln):
+        self.by_date(tgl_bayar, jml_bln)
+        self.by_month(tgl_bayar, jml_bln)
+
+    def test_sebelum_jatuh_tempo(self):
+        tgl_bayar = date(2019, 8, 31)
+        self.bandingkan(tgl_bayar, 0)
+
+    def test_saat_jatuh_tempo(self):
+        tgl_bayar = date(2019, 9, 20)
+        self.bandingkan(tgl_bayar, 0)
+
+    def test_setelah_jatuh_tempo_bulan_sama(self):
+        tgl_bayar = date(2019, 9, 21)
+        self.by_date(tgl_bayar, 1)
+        self.by_month(tgl_bayar, 0)
+
+    def test_setelah_jatuh_tempo_bulan_beda(self):
+        tgl_bayar = date(2019, 10, 1)
+        self.bandingkan(tgl_bayar, 1)
+
+    def test_setelah_jatuh_tempo_tahun_beda(self):
+        tgl_bayar = date(2020, 1, 2)
+        self.bandingkan(tgl_bayar, 4)
+
+
+if __name__ == '__main__':
+    unittest.main()