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billing · bashcmp-7hx2

aqua@cmp-7hx2:~$ git clone https://github.com/northwind/billing

Cloning into 'billing'...

remote: Enumerating objects: 8412, done.

remote: Counting objects: 100% (8412/8412), done.

Receiving objects: 100% (8412/8412), 21.30 MiB | 48.20 MiB/s, done.

Resolving deltas: 100% (5127/5127), done.

aqua@cmp-7hx2:~/billing$ git switch -c fix/half-cent-rounding

Switched to a new branch 'fix/half-cent-rounding'

aqua@cmp-7hx2:~/billing$ bun install

bun install v1.3.1

+ @types/bun@1.3.1

+ typescript@5.9.3

+ zod@4.1.12

38 packages installed [1.84s]

aqua@cmp-7hx2:~/billing$ bun test

src/customer.test.ts:

✓ creates a customer with a billing email [0.15ms]

✓ rejects a customer without a currency [0.30ms]

✓ normalizes the email's case [0.18ms]

✓ merges duplicate customers [0.11ms]

✓ archives a customer with no open invoices [0.29ms]

src/currency.test.ts:

✓ formats USD with two decimals [0.03ms]

✓ formats JPY without decimals [0.25ms]

✓ rejects an unknown currency code [0.24ms]

✓ converts at the stored daily rate [0.31ms]

✓ keeps minor units as integers [0.03ms]

src/discount.test.ts:

✓ applies a fixed discount [0.26ms]

✓ caps a percentage discount at the subtotal [0.07ms]

✓ allows one coupon per invoice [0.03ms]

✓ expires coupons at midnight UTC [0.17ms]

✓ skips tax lines [0.21ms]

src/invoice.test.ts:

✓ totals line items [0.06ms]

✓ applies a percentage discount [0.03ms]

✗ rounds half cents to even [0.04ms]

expect(received).toBe(expected)

Expected: 10.12

Received: 10.13

at <anonymous> (src/invoice.test.ts:58:31)

✓ carries the currency onto each line [0.16ms]

✓ sums tax per line before rounding [0.31ms]

✓ issues a credit note for a refund [0.31ms]

src/ledger.test.ts:

✓ posts an invoice as two entries [0.17ms]

✓ balances debits and credits [0.18ms]

✓ reverses a voided invoice [0.04ms]

✓ rejects entries in a closed period [0.09ms]

✓ orders entries by posting time [0.10ms]

src/payment.test.ts:

✓ marks an invoice paid in full [0.03ms]

✓ records a partial payment [0.04ms]

✓ refunds to the original method [0.10ms]

✓ retries a declined card once [0.25ms]

✓ ignores a duplicate payment event [0.31ms]

✓ settles in the invoice's currency [0.31ms]

src/round.test.ts:

✓ rounds half a cent down to even [0.17ms]

✓ rounds one and a half cents up to even [0.08ms]

✓ leaves whole cents alone [0.26ms]

✓ handles negative amounts [0.26ms]

✓ converts cents to dollars [0.04ms]

src/schedule.test.ts:

✓ bills monthly on the anchor day [0.17ms]

✓ prorates a mid-cycle upgrade [0.25ms]

✓ skips a paused subscription [0.18ms]

✓ moves the anchor in February [0.25ms]

✓ bills annually in advance [0.04ms]

src/tax.test.ts:

✓ applies the customer's tax rate [0.17ms]

✓ exempts a tax-exempt customer [0.03ms]

✓ rounds the rate to basis points [0.17ms]

✓ adds tax per line [0.06ms]

✓ reports tax by region [0.05ms]

✓ leaves credit notes untaxed [0.18ms]

47 pass

1 fail

96 expect() calls

Ran 48 tests across 9 files. [412.00ms]

aqua@cmp-7hx2:~/billing$ grep -rn "Math.round" src

src/round.ts:9: return Math.round(cents) / 100;

src/tax.ts:12: const rate = Math.round(percent * 100) / 10000;

aqua@cmp-7hx2:~/billing$ sed -n '1,10p' src/round.ts

export function roundHalfEven(cents: number): number {

const floor = Math.floor(cents);

if (cents - floor !== 0.5) return Math.round(cents);

return floor % 2 === 0 ? floor : floor + 1;

}

export function toDollars(cents: number): number {

// Half cents round to even. See docs/rounding.md

return Math.round(cents) / 100;

}

aqua@cmp-7hx2:~/billing$ sed -i '9s/Math.round/roundHalfEven/' src/round.ts

aqua@cmp-7hx2:~/billing$ bun test src/invoice.test.ts

src/invoice.test.ts:

✓ totals line items [0.19ms]

✓ applies a percentage discount [0.16ms]

✓ rounds half cents to even [0.17ms]

✓ carries the currency onto each line [0.29ms]

✓ sums tax per line before rounding [0.15ms]

✓ issues a credit note for a refund [0.15ms]

6 pass

0 fail

14 expect() calls

Ran 6 tests across 1 file. [38.00ms]

aqua@cmp-7hx2:~/billing$ bun test

src/customer.test.ts:

✓ creates a customer with a billing email [0.12ms]

✓ rejects a customer without a currency [0.27ms]

✓ normalizes the email's case [0.15ms]

✓ merges duplicate customers [0.08ms]

✓ archives a customer with no open invoices [0.26ms]

src/currency.test.ts:

✓ formats USD with two decimals [0.29ms]

✓ formats JPY without decimals [0.22ms]

✓ rejects an unknown currency code [0.21ms]

✓ converts at the stored daily rate [0.28ms]

✓ keeps minor units as integers [0.29ms]

src/discount.test.ts:

✓ applies a fixed discount [0.23ms]

✓ caps a percentage discount at the subtotal [0.04ms]

✓ allows one coupon per invoice [0.29ms]

✓ expires coupons at midnight UTC [0.14ms]

✓ skips tax lines [0.18ms]

src/invoice.test.ts:

✓ totals line items [0.03ms]

✓ applies a percentage discount [0.29ms]

✓ rounds half cents to even [0.30ms]

✓ carries the currency onto each line [0.13ms]

✓ sums tax per line before rounding [0.28ms]

✓ issues a credit note for a refund [0.28ms]

src/ledger.test.ts:

✓ posts an invoice as two entries [0.14ms]

✓ balances debits and credits [0.15ms]

✓ reverses a voided invoice [0.30ms]

✓ rejects entries in a closed period [0.06ms]

✓ orders entries by posting time [0.07ms]

src/payment.test.ts:

✓ marks an invoice paid in full [0.29ms]

✓ records a partial payment [0.30ms]

✓ refunds to the original method [0.07ms]

✓ retries a declined card once [0.22ms]

✓ ignores a duplicate payment event [0.28ms]

✓ settles in the invoice's currency [0.28ms]

src/round.test.ts:

✓ rounds half a cent down to even [0.14ms]

✓ rounds one and a half cents up to even [0.05ms]

✓ leaves whole cents alone [0.23ms]

✓ handles negative amounts [0.23ms]

✓ converts cents to dollars [0.30ms]

src/schedule.test.ts:

✓ bills monthly on the anchor day [0.14ms]

✓ prorates a mid-cycle upgrade [0.22ms]

✓ skips a paused subscription [0.15ms]

✓ moves the anchor in February [0.22ms]

✓ bills annually in advance [0.30ms]

src/tax.test.ts:

✓ applies the customer's tax rate [0.14ms]

✓ exempts a tax-exempt customer [0.29ms]

✓ rounds the rate to basis points [0.14ms]

✓ adds tax per line [0.03ms]

✓ reports tax by region [0.31ms]

✓ leaves credit notes untaxed [0.15ms]

48 pass

0 fail

97 expect() calls

Ran 48 tests across 9 files. [398.00ms]

aqua@cmp-7hx2:~/billing$ git diff

diff --git a/src/round.ts b/src/round.ts

@@ -6,5 +6,5 @@ export function roundHalfEven(cents: number): number {

export function toDollars(cents: number): number {

// Half cents round to even. See docs/rounding.md

- return Math.round(cents) / 100;

+ return roundHalfEven(cents) / 100;

}

aqua@cmp-7hx2:~/billing$ git commit -am "Round half cents to even in invoice totals"

[fix/half-cent-rounding 3f9c2a1] Round half cents to even in invoice totals

1 file changed, 1 insertion(+), 1 deletion(-)

aqua@cmp-7hx2:~/billing$ git push -u origin fix/half-cent-rounding

To https://github.com/northwind/billing.git

* [new branch] fix/half-cent-rounding -> fix/half-cent-rounding

branch 'fix/half-cent-rounding' set up to track 'origin/fix/half-cent-rounding'.

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Hours of work a day Every day for 30 days.

Computers Each with 2 vCPUs, 4 GiB of memory and a 40 GiB disk.

Per month

$4.19

Daytona $52.40

E2B $49.68

Vercel Sandbox $36.32

Agent37 $5.27

Elios Computer $4.19

Breakdown

Active CPU 60 vCPU-hours × $0.012	$0.72
Memory 192 GiB-hours × $0.006	$1.15
Storage
Template 30 GiB × $0.04	$1.20
From the template 30 GiB × $0.024	$0.72
Its own 10 GiB × $0.04	$0.40
Total	$4.19

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