| 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) |
| |
| |
| class TestFifoValuation(unittest.TestCase): |
| |
| def setUp(self): |
| self.queue = FIFOValuation([]) |
| |
| def tearDown(self): |
| qty, value = self.queue.get_total_stock_and_value() |
| self.assertTotalQty(qty) |
| self.assertTotalValue(value) |
| |
| def assertTotalQty(self, qty): |
| self.assertAlmostEqual(sum(q for q, _ in self.queue), qty, msg=f"queue: {self.queue}", places=4) |
| |
| def assertTotalValue(self, value): |
| 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) |
| self.assertTotalQty(1) |
| |
| def test_simple_removal(self): |
| self.queue.add_stock(1, 10) |
| self.queue.remove_stock(1) |
| self.assertTotalQty(0) |
| |
| def test_merge_new_stock(self): |
| self.queue.add_stock(1, 10) |
| self.queue.add_stock(1, 10) |
| self.assertEqual(self.queue, [[2, 10]]) |
| |
| def test_adding_negative_stock_keeps_rate(self): |
| self.queue = FIFOValuation([[-5.0, 100]]) |
| self.queue.add_stock(1, 10) |
| self.assertEqual(self.queue, [[-4, 100]]) |
| |
| def test_adding_negative_stock_updates_rate(self): |
| self.queue = FIFOValuation([[-5.0, 100]]) |
| self.queue.add_stock(6, 10) |
| self.assertEqual(self.queue, [[1, 10]]) |
| |
| |
| def test_negative_stock(self): |
| self.queue.remove_stock(1, 5) |
| self.assertEqual(self.queue, [[-1, 5]]) |
| |
| # XXX |
| self.queue.remove_stock(1, 10) |
| self.assertTotalQty(-2) |
| |
| self.queue.add_stock(2, 10) |
| self.assertTotalQty(0) |
| self.assertTotalValue(0) |
| |
| def test_removing_specified_rate(self): |
| self.queue.add_stock(1, 10) |
| self.queue.add_stock(1, 20) |
| |
| self.queue.remove_stock(1, 20) |
| self.assertEqual(self.queue, [[1, 10]]) |
| |
| |
| def test_remove_multiple_bins(self): |
| self.queue.add_stock(1, 10) |
| self.queue.add_stock(2, 20) |
| self.queue.add_stock(1, 20) |
| self.queue.add_stock(5, 20) |
| |
| self.queue.remove_stock(4) |
| self.assertEqual(self.queue, [[5, 20]]) |
| |
| |
| def test_remove_multiple_bins_with_rate(self): |
| self.queue.add_stock(1, 10) |
| self.queue.add_stock(2, 20) |
| self.queue.add_stock(1, 20) |
| self.queue.add_stock(5, 20) |
| |
| self.queue.remove_stock(3, 20) |
| self.assertEqual(self.queue, [[1, 10], [5, 20]]) |
| |
| def test_collapsing_of_queue(self): |
| self.queue.add_stock(1, 1) |
| self.queue.add_stock(1, 2) |
| self.queue.add_stock(1, 3) |
| self.queue.add_stock(1, 4) |
| |
| self.assertTotalValue(10) |
| |
| 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) |
| self.assertTotalQty(0) |
| |
| def test_rounding_off_near_zero(self): |
| self.assertEqual(_round_off_if_near_zero(0), 0) |
| self.assertEqual(_round_off_if_near_zero(1), 1) |
| self.assertEqual(_round_off_if_near_zero(-1), -1) |
| self.assertEqual(_round_off_if_near_zero(-1e-8), 0) |
| self.assertEqual(_round_off_if_near_zero(1e-8), 0) |
| |
| def test_totals(self): |
| self.queue.add_stock(1, 10) |
| self.queue.add_stock(2, 13) |
| self.queue.add_stock(1, 17) |
| 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) |