FA-64314 / Medication dosing calculations / Member archive

Infusion bag run-out time across rate changes: alarm floor at zero · case 04

A small bag shows an alarm time before the infusion started.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input {bag_ml, segments [[start_min, rate_ml_h], ...] ascending from 0}. Each segment runs until the next start; the last segment is open-ended. Paused segments (rate 0) consume nothing. Return {empty_min, alarm_min = max(0, empty-30)} rounded to 0.1 min, or both None when the bag never empties.

Why this case matters

Run-out prediction walks piecewise-constant rates; segment edges, open-ended tails and unit conversion fail independently.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
small bag alarm clamps at zero	`{"alarm_min": -21.4, "empty_min": 8.6}`	`{"alarm_min": 0.0, "empty_min": 8.6}`	Failed

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