Перевод на доменную архитектуру

tests/Unit/Reports/BedDaysCalculatorTest.php

@@ -0,0 +1,38 @@
+<?php
+
+use App\Domain\Reports\Calculators\BedDaysCalculator;
+use App\Domain\Reports\Models\StayInterval;
+
+it('calculates total and average bed days', function () {
+    $calculator = new BedDaysCalculator;
+
+    $result = $calculator->calculate([
+        new StayInterval(
+            startAt: new DateTimeImmutable('2026-04-01 10:00:00'),
+            endAt: new DateTimeImmutable('2026-04-04 09:00:00'),
+        ),
+        new StayInterval(
+            startAt: new DateTimeImmutable('2026-04-05 10:00:00'),
+            endAt: new DateTimeImmutable('2026-04-07 09:00:00'),
+        ),
+    ]);
+
+    expect($result->total)->toBe(5)
+        ->and($result->count)->toBe(2)
+        ->and($result->average)->toBe(2.5);
+});
+
+it('ignores invalid bed day intervals', function () {
+    $calculator = new BedDaysCalculator;
+
+    $result = $calculator->calculate([
+        new StayInterval(
+            startAt: new DateTimeImmutable('2026-04-04 10:00:00'),
+            endAt: new DateTimeImmutable('2026-04-01 09:00:00'),
+        ),
+    ]);
+
+    expect($result->total)->toBe(0)
+        ->and($result->count)->toBe(0)
+        ->and($result->average)->toBe(0.0);
+});