MIL-004 Lecture step 3: buy the most expensive affordable upgrade
Metadata
| Key |
Value |
| ID |
MIL-004 |
| CrossReference |
BC-001 |
| Language |
en |
| Domain |
it |
Version History
| Date |
Status |
Author |
Reviewer |
Change |
Commit |
| 2026-10-28 |
Accepted |
Jens Tirsvad Nielsen |
AI as stand-in for S02 |
Initial version |
cadc5ef |
Purpose
Decide whether the bot reads the cookie count and prices correctly and buys the most expensive upgrade it can afford every 5 seconds (lecture step 3).
Deliverable
Parsing helpers (strip, split and replace on the page text), the selection rule, the purchase action on a 5 second timer, unit tests for the rule, and the screenshot for lecture step 3.
Go / No-Go Criteria
| # |
Criterion (objectively checkable) |
Go |
No-Go |
| 1 |
Parsing handles values such as 1,234 cookies, 105 and prices with thousands separators |
All parametrised tests pass |
A case fails |
| 2 |
With 105 cookies, Grandma costing more than Cursor, the rule picks Grandma |
Test passes |
Test fails |
| 3 |
A containerised run buys at least one upgrade |
Purchase visible in the log and screenshot |
No purchase |
| 4 |
docs/images/step-3.png exists |
File exists |
File missing |
| 5 |
The code review against qc-programming-python.md is Go |
RC-* is Go |
No-Go |
Dependencies
| Depends on |
Reason |
| MIL-003 |
Needs the open and click functions |
Traceability
| Business Case objective / KPI / user story |
Reference |
| O2, success criterion 3 |
BC-001 |
| CN-001, CN-004 |
SA-001 |
Ownership
| Role |
Stakeholder ID (SA) |
| Owner |
S01 |
| Approving reviewer |
S02 (AI as stand-in, autonomous mode, not independent) |
Target Date
2026-10-31 — inside the planned window 2026-10-28 to 2026-11-04 of PP-001; the Business Case sets no deadline.
Tasks
| # |
Task |
Summary |
Needs its own Use Case/User Story? |
Reference |
| 1 |
Read the cookie count from the page |
Implement get_cookie_count, turning the page text into an integer with strip, split and replace (the assignment's hints) and covering thousands separators and the plural word. |
No |
O2 |
| 2 |
Read the product prices and availability |
Implement the function that returns each product with its price and whether it is affordable, reading the right-hand pane. |
No |
O2 |
| 3 |
Choose the most expensive affordable upgrade |
Implement the pure selection function. It is separate from Selenium so it is fully unit tested, including the 105 cookie Grandma versus Cursor example. |
No |
O2 |
| 4 |
Buy on a 5 second timer |
Implement the timer that checks every 5 seconds while the clicking continues and buys the selected upgrade. Save step-3.png from a container run. |
No |
O2 |
