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Copy pathpacker_property_test.go
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264 lines (225 loc) · 7.99 KB
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package boxpacker3_test
import (
"context"
"testing"
"github.com/stretchr/testify/require"
"github.com/bavix/boxpacker3/v2"
)
func strategyName(strategy boxpacker3.RuleSettings) string {
return strategy.Name()
}
//nolint:funlen
func TestPacker_Property_AllItemsAccountedFor(t *testing.T) {
t.Parallel()
strategies := []boxpacker3.RuleSettings{
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectNextFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectWorstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectAlmostWorstFit},
}
testCases := []struct {
name string
boxes []*boxpacker3.Box
items []*boxpacker3.Item
}{
{
name: "SingleBox",
boxes: []*boxpacker3.Box{
boxpacker3.NewBox("box-1", 100, 100, 100, 2000),
},
items: []*boxpacker3.Item{
boxpacker3.NewItem("item-1", 30, 30, 30, 100),
boxpacker3.NewItem("item-2", 30, 30, 30, 100),
boxpacker3.NewItem("item-3", 30, 30, 30, 100),
},
},
{
name: "MultipleBoxes",
boxes: []*boxpacker3.Box{
boxpacker3.NewBox("box-1", 100, 100, 100, 2000),
boxpacker3.NewBox("box-2", 100, 100, 100, 2000),
boxpacker3.NewBox("box-3", 100, 100, 100, 2000),
},
items: []*boxpacker3.Item{
boxpacker3.NewItem("item-1", 40, 40, 40, 200),
boxpacker3.NewItem("item-2", 40, 40, 40, 200),
boxpacker3.NewItem("item-3", 40, 40, 40, 200),
boxpacker3.NewItem("item-4", 40, 40, 40, 200),
boxpacker3.NewItem("item-5", 40, 40, 40, 200),
},
},
{
name: "MixedSizes",
boxes: []*boxpacker3.Box{
boxpacker3.NewBox("small", 50, 50, 50, 1000),
boxpacker3.NewBox("medium", 100, 100, 100, 2000),
boxpacker3.NewBox("large", 200, 200, 200, 5000),
},
items: []*boxpacker3.Item{
boxpacker3.NewItem("tiny", 10, 10, 10, 50),
boxpacker3.NewItem("small", 30, 30, 30, 200),
boxpacker3.NewItem("medium", 60, 60, 60, 500),
boxpacker3.NewItem("large", 80, 80, 80, 800),
},
},
{
name: "UnfitItems",
boxes: []*boxpacker3.Box{
boxpacker3.NewBox("small", 50, 50, 50, 1000),
},
items: []*boxpacker3.Item{
boxpacker3.NewItem("fit", 30, 30, 30, 200),
boxpacker3.NewItem("unfit", 200, 200, 200, 5000),
},
},
}
for _, strategy := range strategies {
for _, tc := range testCases {
strategyName := strategyName(strategy)
t.Run(strategyName+"_"+tc.name, func(t *testing.T) {
t.Parallel()
packer := rulePacker(strategy.Order, strategy.Selection)
result, err := packer.Pack(context.Background(), tc.boxes, tc.items)
require.NoError(t, err)
require.NotNil(t, result)
totalPacked := 0
for _, box := range result.Boxes {
totalPacked += len(box.Items)
}
require.Equal(t, len(tc.items), totalPacked+len(result.Unpacked),
"All items must be either packed or in UnfitItems")
})
}
}
}
func TestPacker_Property_NoDuplicates(t *testing.T) {
t.Parallel()
strategies := []boxpacker3.RuleSettings{
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectNextFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectWorstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectAlmostWorstFit},
}
boxes := []*boxpacker3.Box{
boxpacker3.NewBox("box-1", 100, 100, 100, 2000),
boxpacker3.NewBox("box-2", 100, 100, 100, 2000),
}
items := []*boxpacker3.Item{
boxpacker3.NewItem("item-1", 30, 30, 30, 100),
boxpacker3.NewItem("item-2", 30, 30, 30, 100),
boxpacker3.NewItem("item-3", 30, 30, 30, 100),
boxpacker3.NewItem("item-4", 30, 30, 30, 100),
boxpacker3.NewItem("item-5", 30, 30, 30, 100),
}
for _, strategy := range strategies {
strategyName := strategyName(strategy)
t.Run(strategyName, func(t *testing.T) {
t.Parallel()
packer := rulePacker(strategy.Order, strategy.Selection)
result, err := packer.Pack(context.Background(), boxes, items)
require.NoError(t, err)
require.NotNil(t, result)
itemCounts := make(map[string]int)
for _, box := range result.Boxes {
for _, item := range box.Items {
itemCounts[item.ID()]++
}
}
for _, item := range result.Unpacked {
itemCounts[item.ID()]++
}
for _, item := range items {
require.Equal(t, 1, itemCounts[item.ID()],
"Item %s should appear exactly once", item.ID())
}
})
}
}
func TestPacker_Property_NoIntersections(t *testing.T) {
t.Parallel()
strategies := []boxpacker3.RuleSettings{
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectNextFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectWorstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectAlmostWorstFit},
}
boxes := []*boxpacker3.Box{
boxpacker3.NewBox("box-1", 100, 100, 100, 2000),
boxpacker3.NewBox("box-2", 100, 100, 100, 2000),
}
items := []*boxpacker3.Item{
boxpacker3.NewItem("item-1", 30, 30, 30, 100),
boxpacker3.NewItem("item-2", 30, 30, 30, 100),
boxpacker3.NewItem("item-3", 30, 30, 30, 100),
boxpacker3.NewItem("item-4", 30, 30, 30, 100),
}
for _, strategy := range strategies {
strategyName := strategyName(strategy)
t.Run(strategyName, func(t *testing.T) {
t.Parallel()
packer := rulePacker(strategy.Order, strategy.Selection)
result, err := packer.Pack(context.Background(), boxes, items)
require.NoError(t, err)
require.NotNil(t, result)
validatePackingInvariants(t, result)
})
}
}
func TestPacker_Property_WeightConstraints(t *testing.T) {
t.Parallel()
strategies := []boxpacker3.RuleSettings{
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectFirstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderDecreasing, Selection: boxpacker3.SelectBestFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectNextFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectWorstFit},
{Order: boxpacker3.OrderIncreasing, Selection: boxpacker3.SelectAlmostWorstFit},
}
boxes := []*boxpacker3.Box{
boxpacker3.NewBox("light", 100, 100, 100, 500),
boxpacker3.NewBox("heavy", 100, 100, 100, 2000),
}
items := []*boxpacker3.Item{
boxpacker3.NewItem("item-1", 30, 30, 30, 200),
boxpacker3.NewItem("item-2", 30, 30, 30, 200),
boxpacker3.NewItem("item-3", 30, 30, 30, 200),
}
for _, strategy := range strategies {
strategyName := strategyName(strategy)
t.Run(strategyName, func(t *testing.T) {
t.Parallel()
packer := rulePacker(strategy.Order, strategy.Selection)
result, err := packer.Pack(context.Background(), boxes, items)
require.NoError(t, err)
require.NotNil(t, result)
for _, box := range result.Boxes {
totalWeight := 0.0
for _, item := range box.Items {
totalWeight += item.Weight()
}
require.LessOrEqual(t, totalWeight, box.Box.MaxWeight(),
"Box %s should respect weight constraint", box.ID())
}
})
}
}
func validatePackingInvariants(t *testing.T, result *boxpacker3.Result) {
t.Helper()
for _, box := range result.Boxes {
requireNoOverlap(t, box)
requireWithinCapacity(t, box)
for _, item := range box.Items {
requireWithinBox(t, box, item)
}
}
}