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Fixed average cost calculation

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Valeron
2025-11-23 20:43:55 +05:30
parent 3fe9768d72
commit 83bbabdc2d
2 changed files with 39 additions and 7 deletions
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29
test/models/holding_test.rb
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@@ -1,5 +1,6 @@
require "test_helper"
require "ostruct"
require "bigdecimal"
class HoldingTest < ActiveSupport::TestCase
include EntriesTestHelper, SecuritiesTestHelper
@@ -26,8 +27,17 @@ class HoldingTest < ActiveSupport::TestCase
create_trade(@nvda.security, account: @account, qty: 5, price: 128.00, date: 1.day.ago.to_date)
create_trade(@nvda.security, account: @account, qty: 30, price: 124.00, date: Date.current)
assert_equal Money.new((212.00 + 216.00).to_d / 2), @amzn.avg_cost
assert_equal Money.new((128.00 + 124.00).to_d / 2), @nvda.avg_cost
# expected weighted averages (quantity-weighted)
amzn_total = BigDecimal("10") * BigDecimal("212.00") + BigDecimal("15") * BigDecimal("216.00")
amzn_qty = BigDecimal("10") + BigDecimal("15")
expected_amzn = amzn_total / amzn_qty
nvda_total = BigDecimal("5") * BigDecimal("128.00") + BigDecimal("30") * BigDecimal("124.00")
nvda_qty = BigDecimal("5") + BigDecimal("30")
expected_nvda = nvda_total / nvda_qty
assert_equal Money.new(expected_amzn), @amzn.avg_cost
assert_equal Money.new(expected_nvda), @nvda.avg_cost
end
test "calculates average cost basis from another currency" do
@@ -37,8 +47,19 @@ class HoldingTest < ActiveSupport::TestCase
create_trade(@nvda.security, account: @account, qty: 5, price: 128.00, date: 1.day.ago.to_date, currency: "CAD")
create_trade(@nvda.security, account: @account, qty: 30, price: 124.00, date: Date.current, currency: "CAD")
assert_equal Money.new((212.00 + 216.00).to_d / 2, "CAD").exchange_to("USD", fallback_rate: 1), @amzn.avg_cost
assert_equal Money.new((128.00 + 124.00).to_d / 2, "CAD").exchange_to("USD", fallback_rate: 1), @nvda.avg_cost
# compute expected: sum(price * qty * rate) / sum(qty)
amzn_total_usd = BigDecimal("10") * BigDecimal("212.00") * BigDecimal("1") +
BigDecimal("15") * BigDecimal("216.00") * BigDecimal("1")
amzn_qty = BigDecimal("10") + BigDecimal("15")
expected_amzn_usd = amzn_total_usd / amzn_qty
nvda_total_usd = BigDecimal("5") * BigDecimal("128.00") * BigDecimal("1") +
BigDecimal("30") * BigDecimal("124.00") * BigDecimal("1")
nvda_qty = BigDecimal("5") + BigDecimal("30")
expected_nvda_usd = nvda_total_usd / nvda_qty
assert_equal Money.new(expected_amzn_usd, "CAD").exchange_to("USD", fallback_rate: 1), @amzn.avg_cost
assert_equal Money.new(expected_nvda_usd, "CAD").exchange_to("USD", fallback_rate: 1), @nvda.avg_cost
end
test "calculates total return trend" do