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test: hypothesis tests for FIFO queue

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Ankush Menat 2021-12-19 17:02:04 +05:30 committed by Ankush Menat
parent 9d177433cb
commit aa0e163b1f
2 changed files with 61 additions and 15 deletions
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1
dev-requirements.txt Normal file
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@ -0,0 +1 @@
hypothesis~=6.31.0

75
erpnext/stock/tests/test_valuation.py
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@ -1,10 +1,14 @@
import unittest
from hypothesis import given
from hypothesis import strategies as st
from erpnext.stock.valuation import FifoValuation, _round_off_if_near_zero
qty_gen = st.floats(min_value=-1e6, max_value=1e6)
value_gen = st.floats(min_value=1, max_value=1e6)
stock_queue_generator = st.lists(st.tuples(qty_gen, value_gen), min_size=10)
def rate_generator():
return 0.0
class TestFifoValuation(unittest.TestCase):
@ -17,10 +21,10 @@ class TestFifoValuation(unittest.TestCase):
self.assertTotalValue(value)
def assertTotalQty(self, qty):
self.assertEqual(sum(q for q, _ in self.queue), qty, msg=f"queue: {self.queue}")
self.assertAlmostEqual(sum(q for q, _ in self.queue), qty, msg=f"queue: {self.queue}", places=4)
def assertTotalValue(self, value):
self.assertEqual(sum(q * r for q, r in self.queue), value, msg=f"queue: {self.queue}")
self.assertAlmostEqual(sum(q * r for q, r in self.queue), value, msg=f"queue: {self.queue}", places=2)
def test_simple_addition(self):
self.queue.add_stock(1, 10)
@ -28,7 +32,7 @@ class TestFifoValuation(unittest.TestCase):
def test_simple_removal(self):
self.queue.add_stock(1, 10)
self.queue.remove_stock(1, 0, rate_generator)
self.queue.remove_stock(1)
self.assertTotalQty(0)
def test_merge_new_stock(self):
@ -48,11 +52,11 @@ class TestFifoValuation(unittest.TestCase):
def test_negative_stock(self):
self.queue.remove_stock(1, 5, rate_generator)
self.queue.remove_stock(1, 5)
self.assertEqual(self.queue, [[-1, 5]])
# XXX
self.queue.remove_stock(1, 10, rate_generator)
self.queue.remove_stock(1, 10)
self.assertTotalQty(-2)
self.queue.add_stock(2, 10)
@ -63,7 +67,7 @@ class TestFifoValuation(unittest.TestCase):
self.queue.add_stock(1, 10)
self.queue.add_stock(1, 20)
self.queue.remove_stock(1, 20, rate_generator)
self.queue.remove_stock(1, 20)
self.assertEqual(self.queue, [[1, 10]])
@ -73,7 +77,7 @@ class TestFifoValuation(unittest.TestCase):
self.queue.add_stock(1, 20)
self.queue.add_stock(5, 20)
self.queue.remove_stock(4, 0, rate_generator)
self.queue.remove_stock(4)
self.assertEqual(self.queue, [[5, 20]])
@ -83,7 +87,7 @@ class TestFifoValuation(unittest.TestCase):
self.queue.add_stock(1, 20)
self.queue.add_stock(5, 20)
self.queue.remove_stock(3, 20, rate_generator)
self.queue.remove_stock(3, 20)
self.assertEqual(self.queue, [[1, 10], [5, 20]])
def test_collapsing_of_queue(self):
@ -94,13 +98,13 @@ class TestFifoValuation(unittest.TestCase):
self.assertTotalValue(10)
self.queue.remove_stock(3, 1, rate_generator)
self.queue.remove_stock(3, 1)
# XXX
self.assertEqual(self.queue, [[1, 7]])
def test_rounding_off(self):
self.queue.add_stock(1.0, 1.0)
self.queue.remove_stock(1.0 - 1e-9, 0.0, rate_generator)
self.queue.remove_stock(1.0 - 1e-9)
self.assertTotalQty(0)
def test_rounding_off_near_zero(self):
@ -114,8 +118,49 @@ class TestFifoValuation(unittest.TestCase):
self.queue.add_stock(1, 10)
self.queue.add_stock(2, 13)
self.queue.add_stock(1, 17)
self.queue.remove_stock(1, 0, rate_generator)
self.queue.remove_stock(1, 0, rate_generator)
self.queue.remove_stock(1, 0, rate_generator)
self.queue.remove_stock(1)
self.queue.remove_stock(1)
self.queue.remove_stock(1)
self.queue.add_stock(5, 17)
self.queue.add_stock(8, 11)
@given(stock_queue_generator)
def test_fifo_qty_hypothesis(self, stock_queue):
self.queue = FifoValuation([])
total_qty = 0
for qty, rate in stock_queue:
if qty == 0:
continue
if qty > 0:
self.queue.add_stock(qty, rate)
total_qty += qty
else:
qty = abs(qty)
consumed = self.queue.remove_stock(qty)
self.assertAlmostEqual(qty, sum(q for q, _ in consumed), msg=f"incorrect consumption {consumed}")
total_qty -= qty
self.assertTotalQty(total_qty)
@given(stock_queue_generator)
def test_fifo_qty_value_nonneg_hypothesis(self, stock_queue):
self.queue = FifoValuation([])
total_qty = 0.0
total_value = 0.0
for qty, rate in stock_queue:
# don't allow negative stock
if qty == 0 or total_qty + qty < 0 or abs(qty) < 0.1:
continue
if qty > 0:
self.queue.add_stock(qty, rate)
total_qty += qty
total_value += qty * rate
else:
qty = abs(qty)
consumed = self.queue.remove_stock(qty)
self.assertAlmostEqual(qty, sum(q for q, _ in consumed), msg=f"incorrect consumption {consumed}")
total_qty -= qty
total_value -= sum(q * r for q, r in consumed)
self.assertTotalQty(total_qty)
self.assertTotalValue(total_value)