PACKVIUM
    SourceTry it
    FIXTURE / regression-group-atomicity

    Group atomicity

    A two-item group that cannot travel together is rejected as a whole, and the unrelated items in the same order are not stranded with it.

    COVERSgrouping
    PROVESgroup rejected as a whole
    STATUSVALIDATED
    PLACEMENTS FROM THE ENGINE RENDER INTO THIS SURFACE
    100×100×100 · 3.2% used
    loose × 4
    REFUSED · 2
    half-a-0Its group cannot be kept togetherInferred
    half-b-1Its group cannot be kept togetherInferred
    RULES THIS FIXTURE EXERCISES

    What it pins down.

    grouping
    INDEPENDENT VALIDATION

    Checked again by an implementation that shares no code.

    The validator recomputes the objective and every affected rule from the returned placements, with an implementation that shares no code with the solver. Inject a failure to see how a rejected result reports itself.

    VALIDATEDfixture / regression-group-atomicity
    Bounds4 / 4
    Collision0
    Allowed rotations4 / 4
    Support ratioPASS
    Cumulative top loadPASS
    Stack densityPASS
    Centre of massPASS
    Axle loadPASS
    scoreUnits left over 0
    SOURCE-FIRST

    The fixture id is the same everywhere.

    The fixture id is the same in the conformance corpus, the field matrix and a bug report. Reproducing a defect means naming a file, not describing a screenshot.