instances added god may help

tests/Service/Scheduler/ScheduleCalculatorTest.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace MintyPHP\Tests\Service\Scheduler;
+
+use MintyPHP\Service\Scheduler\ScheduleCalculator;
+use PHPUnit\Framework\TestCase;
+
+class ScheduleCalculatorTest extends TestCase
+{
+    public function testCalculateNextRunUtcDailySameDayWhenTimeIsInFuture(): void
+    {
+        $calculator = new ScheduleCalculator();
+        $job = [
+            'schedule_type' => 'daily',
+            'schedule_interval' => 1,
+            'timezone' => 'UTC',
+            'schedule_time' => '12:00',
+        ];
+        $reference = new \DateTimeImmutable('2026-02-22 10:30:00', new \DateTimeZone('UTC'));
+
+        $next = $calculator->calculateNextRunUtc($job, $reference);
+
+        $this->assertInstanceOf(\DateTimeImmutable::class, $next);
+        $this->assertSame('2026-02-22 12:00:00', $next?->setTimezone(new \DateTimeZone('UTC'))->format('Y-m-d H:i:s'));
+    }
+
+    public function testCalculateNextRunUtcDailyMovesToNextDayWhenTimeAlreadyPassed(): void
+    {
+        $calculator = new ScheduleCalculator();
+        $job = [
+            'schedule_type' => 'daily',
+            'schedule_interval' => 1,
+            'timezone' => 'UTC',
+            'schedule_time' => '08:00',
+        ];
+        $reference = new \DateTimeImmutable('2026-02-22 10:30:00', new \DateTimeZone('UTC'));
+
+        $next = $calculator->calculateNextRunUtc($job, $reference);
+
+        $this->assertInstanceOf(\DateTimeImmutable::class, $next);
+        $this->assertSame('2026-02-23 08:00:00', $next?->setTimezone(new \DateTimeZone('UTC'))->format('Y-m-d H:i:s'));
+    }
+
+    public function testNormalizeWeekdaysCsvRemovesDuplicatesAndInvalidValues(): void
+    {
+        $calculator = new ScheduleCalculator();
+
+        $normalized = $calculator->normalizeWeekdaysCsv(['7', '3', '3', '9', '0', '1']);
+
+        $this->assertSame('1,3,7', $normalized);
+    }
+}
+