167 lines
4.5 KiB
Python
167 lines
4.5 KiB
Python
import unittest
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from hypothesis import given
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from hypothesis import strategies as st
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from erpnext.stock.valuation import FIFOValuation, _round_off_if_near_zero
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qty_gen = st.floats(min_value=-1e6, max_value=1e6)
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value_gen = st.floats(min_value=1, max_value=1e6)
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stock_queue_generator = st.lists(st.tuples(qty_gen, value_gen), min_size=10)
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class TestFifoValuation(unittest.TestCase):
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def setUp(self):
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self.queue = FIFOValuation([])
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def tearDown(self):
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qty, value = self.queue.get_total_stock_and_value()
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self.assertTotalQty(qty)
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self.assertTotalValue(value)
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def assertTotalQty(self, qty):
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self.assertAlmostEqual(sum(q for q, _ in self.queue), qty, msg=f"queue: {self.queue}", places=4)
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def assertTotalValue(self, value):
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self.assertAlmostEqual(sum(q * r for q, r in self.queue), value, msg=f"queue: {self.queue}", places=2)
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def test_simple_addition(self):
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self.queue.add_stock(1, 10)
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self.assertTotalQty(1)
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def test_simple_removal(self):
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self.queue.add_stock(1, 10)
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self.queue.remove_stock(1)
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self.assertTotalQty(0)
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def test_merge_new_stock(self):
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self.queue.add_stock(1, 10)
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self.queue.add_stock(1, 10)
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self.assertEqual(self.queue, [[2, 10]])
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def test_adding_negative_stock_keeps_rate(self):
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self.queue = FIFOValuation([[-5.0, 100]])
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self.queue.add_stock(1, 10)
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self.assertEqual(self.queue, [[-4, 100]])
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def test_adding_negative_stock_updates_rate(self):
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self.queue = FIFOValuation([[-5.0, 100]])
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self.queue.add_stock(6, 10)
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self.assertEqual(self.queue, [[1, 10]])
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def test_negative_stock(self):
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self.queue.remove_stock(1, 5)
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self.assertEqual(self.queue, [[-1, 5]])
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# XXX
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self.queue.remove_stock(1, 10)
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self.assertTotalQty(-2)
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self.queue.add_stock(2, 10)
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self.assertTotalQty(0)
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self.assertTotalValue(0)
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def test_removing_specified_rate(self):
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self.queue.add_stock(1, 10)
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self.queue.add_stock(1, 20)
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self.queue.remove_stock(1, 20)
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self.assertEqual(self.queue, [[1, 10]])
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def test_remove_multiple_bins(self):
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self.queue.add_stock(1, 10)
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self.queue.add_stock(2, 20)
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self.queue.add_stock(1, 20)
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self.queue.add_stock(5, 20)
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self.queue.remove_stock(4)
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self.assertEqual(self.queue, [[5, 20]])
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def test_remove_multiple_bins_with_rate(self):
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self.queue.add_stock(1, 10)
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self.queue.add_stock(2, 20)
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self.queue.add_stock(1, 20)
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self.queue.add_stock(5, 20)
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self.queue.remove_stock(3, 20)
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self.assertEqual(self.queue, [[1, 10], [5, 20]])
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def test_collapsing_of_queue(self):
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self.queue.add_stock(1, 1)
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self.queue.add_stock(1, 2)
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self.queue.add_stock(1, 3)
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self.queue.add_stock(1, 4)
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self.assertTotalValue(10)
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self.queue.remove_stock(3, 1)
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# XXX
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self.assertEqual(self.queue, [[1, 7]])
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def test_rounding_off(self):
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self.queue.add_stock(1.0, 1.0)
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self.queue.remove_stock(1.0 - 1e-9)
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self.assertTotalQty(0)
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def test_rounding_off_near_zero(self):
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self.assertEqual(_round_off_if_near_zero(0), 0)
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self.assertEqual(_round_off_if_near_zero(1), 1)
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self.assertEqual(_round_off_if_near_zero(-1), -1)
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self.assertEqual(_round_off_if_near_zero(-1e-8), 0)
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self.assertEqual(_round_off_if_near_zero(1e-8), 0)
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def test_totals(self):
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self.queue.add_stock(1, 10)
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self.queue.add_stock(2, 13)
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self.queue.add_stock(1, 17)
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self.queue.remove_stock(1)
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self.queue.remove_stock(1)
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self.queue.remove_stock(1)
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self.queue.add_stock(5, 17)
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self.queue.add_stock(8, 11)
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@given(stock_queue_generator)
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def test_fifo_qty_hypothesis(self, stock_queue):
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self.queue = FIFOValuation([])
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total_qty = 0
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for qty, rate in stock_queue:
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if qty == 0:
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continue
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if qty > 0:
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self.queue.add_stock(qty, rate)
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total_qty += qty
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else:
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qty = abs(qty)
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consumed = self.queue.remove_stock(qty)
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self.assertAlmostEqual(qty, sum(q for q, _ in consumed), msg=f"incorrect consumption {consumed}")
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total_qty -= qty
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self.assertTotalQty(total_qty)
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@given(stock_queue_generator)
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def test_fifo_qty_value_nonneg_hypothesis(self, stock_queue):
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self.queue = FIFOValuation([])
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total_qty = 0.0
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total_value = 0.0
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for qty, rate in stock_queue:
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# don't allow negative stock
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if qty == 0 or total_qty + qty < 0 or abs(qty) < 0.1:
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continue
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if qty > 0:
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self.queue.add_stock(qty, rate)
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total_qty += qty
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total_value += qty * rate
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else:
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qty = abs(qty)
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consumed = self.queue.remove_stock(qty)
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self.assertAlmostEqual(qty, sum(q for q, _ in consumed), msg=f"incorrect consumption {consumed}")
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total_qty -= qty
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total_value -= sum(q * r for q, r in consumed)
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self.assertTotalQty(total_qty)
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self.assertTotalValue(total_value)
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