129 lines
4 KiB
PHP
129 lines
4 KiB
PHP
<?php
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namespace Tests\Unit\Schedule;
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use App\Schedule\EvenDistributionScheduler;
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use App\Schedule\WorkloadPlacement;
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use DateTimeImmutable;
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use DateTimeZone;
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use PHPUnit\Framework\TestCase;
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class EvenDistributionSchedulerTest extends TestCase
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{
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public function test_it_places_one_heavier_day_at_the_requested_position(): void
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{
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$scheduler = new EvenDistributionScheduler;
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$expectedCounts = [
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WorkloadPlacement::Start->value => [3, 2, 2, 2, 2],
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WorkloadPlacement::Middle->value => [2, 2, 3, 2, 2],
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WorkloadPlacement::End->value => [2, 2, 2, 2, 3],
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];
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foreach (WorkloadPlacement::cases() as $placement) {
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$dates = $scheduler->scheduledDates(
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assignmentCount: 11,
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startDate: $this->utc('2026-08-10'),
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targetDate: $this->utc('2026-08-14'),
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workloadPlacement: $placement,
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);
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$this->assertSame(
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$expectedCounts[$placement->value],
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$this->dailyCounts($dates),
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);
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}
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}
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public function test_it_keeps_multiple_heavier_days_together(): void
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{
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$scheduler = new EvenDistributionScheduler;
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$expectedCounts = [
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WorkloadPlacement::Start->value => [3, 3, 2, 2, 2],
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WorkloadPlacement::Middle->value => [2, 3, 3, 2, 2],
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WorkloadPlacement::End->value => [2, 2, 2, 3, 3],
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];
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foreach (WorkloadPlacement::cases() as $placement) {
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$dates = $scheduler->scheduledDates(
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assignmentCount: 12,
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startDate: $this->utc('2026-08-10'),
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targetDate: $this->utc('2026-08-14'),
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workloadPlacement: $placement,
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);
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$this->assertSame(
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$expectedCounts[$placement->value],
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$this->dailyCounts($dates),
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);
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}
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}
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public function test_it_preserves_sparse_distribution_across_the_full_range(): void
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{
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$dates = (new EvenDistributionScheduler)->scheduledDates(
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assignmentCount: 3,
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startDate: $this->utc('2026-08-10'),
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targetDate: $this->utc('2026-08-16'),
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workloadPlacement: WorkloadPlacement::Middle,
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);
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$this->assertSame(
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['2026-08-10', '2026-08-13', '2026-08-16'],
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$this->formattedDates($dates),
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);
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}
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public function test_it_distributes_even_and_single_day_schedules(): void
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{
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$scheduler = new EvenDistributionScheduler;
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$evenDates = $scheduler->scheduledDates(
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assignmentCount: 10,
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startDate: $this->utc('2026-08-10'),
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targetDate: $this->utc('2026-08-14'),
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workloadPlacement: WorkloadPlacement::End,
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);
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$singleDayDates = $scheduler->scheduledDates(
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assignmentCount: 4,
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startDate: $this->utc('2026-08-10'),
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targetDate: $this->utc('2026-08-10'),
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workloadPlacement: WorkloadPlacement::Middle,
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);
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$this->assertSame([2, 2, 2, 2, 2], $this->dailyCounts($evenDates));
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$this->assertSame(
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[
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'2026-08-10',
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'2026-08-10',
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'2026-08-10',
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'2026-08-10',
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],
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$this->formattedDates($singleDayDates),
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);
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}
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/**
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* @param list<DateTimeImmutable> $dates
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* @return list<int>
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*/
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private function dailyCounts(array $dates): array
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{
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return array_values(array_count_values($this->formattedDates($dates)));
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}
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/**
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* @param list<DateTimeImmutable> $dates
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* @return list<string>
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*/
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private function formattedDates(array $dates): array
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{
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return array_map(function (DateTimeImmutable $date): string {
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return $date->format('Y-m-d');
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}, $dates);
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}
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private function utc(string $date): DateTimeImmutable
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{
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return new DateTimeImmutable($date, new DateTimeZone('UTC'));
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}
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}
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