The expressions above read these as $const. They are the figures the annual refresh replaces, so they live as data rather than being written into the formulas — which is what makes a year-on-year change a one-line diff instead of an edit to arithmetic.
Constant
Value
statutoryWeeks
4
qualifyingMonths
12
Test vectors (7)
Every case is executed against this model on each build, by the Java engine and independently by a JavaScript one. A mismatch of a single cent fails the build, so the page cannot ship advertising a figure the model no longer produces.
Case 1 — N1 four weeks on a five-day week is 20 days
given daysPerWeek
5
given monthsWorked
12
given daysTaken
0
expect fullYearDays
20
expect daysEntitled
20
Case 2 — N2 a four-day week gets 16
given daysPerWeek
4
given monthsWorked
12
given daysTaken
0
expect daysEntitled
16
Case 3 — N3 a six-day week gets 24
given daysPerWeek
6
given monthsWorked
12
given daysTaken
0
expect daysEntitled
24
Case 4 — N4 the entitlement arises AFTER twelve months, so eleven gives nothing
given daysPerWeek
5
given monthsWorked
11
given daysTaken
0
expect daysEntitled
0
Case 5 — N5 at exactly twelve months it arises in full
given daysPerWeek
5
given monthsWorked
12
given daysTaken
0
expect daysEntitled
20
Case 6 — N6 days already taken come off the remainder
given daysPerWeek
5
given monthsWorked
12
given daysTaken
8
expect daysRemaining
12
Case 7 — N7 taking more than the entitlement never goes negative
The whole model as JSON — inputs, outputs, formulas, vectors and sources in one re-runnable document.
This model is published under CC BY 4.0: use it, adapt it, build on it, with attribution. The licence covers the model — the expression of each rule and the arrangement of the catalog. The rates and thresholds are law, and nobody licenses those; the sources above are where they come from.