Перевод на доменную архитектуру

tests/Unit/Reports/PreoperativeDaysCalculatorTest.php

@@ -0,0 +1,38 @@
+<?php
+
+use App\Domain\Reports\Calculators\PreoperativeDaysCalculator;
+use App\Domain\Reports\Models\OperationInterval;
+
+it('calculates total and average preoperative days', function () {
+    $calculator = new PreoperativeDaysCalculator;
+
+    $result = $calculator->calculate([
+        new OperationInterval(
+            admittedAt: new DateTimeImmutable('2026-04-01 10:00:00'),
+            operationAt: new DateTimeImmutable('2026-04-03 09:00:00'),
+        ),
+        new OperationInterval(
+            admittedAt: new DateTimeImmutable('2026-04-05 10:00:00'),
+            operationAt: new DateTimeImmutable('2026-04-06 09:00:00'),
+        ),
+    ]);
+
+    expect($result->total)->toBe(3)
+        ->and($result->count)->toBe(2)
+        ->and($result->average)->toBe(1.5);
+});
+
+it('ignores invalid preoperative intervals', function () {
+    $calculator = new PreoperativeDaysCalculator;
+
+    $result = $calculator->calculate([
+        new OperationInterval(
+            admittedAt: new DateTimeImmutable('2026-04-03 10:00:00'),
+            operationAt: new DateTimeImmutable('2026-04-01 09:00:00'),
+        ),
+    ]);
+
+    expect($result->total)->toBe(0)
+        ->and($result->count)->toBe(0)
+        ->and($result->average)->toBe(0.0);
+});