Fixes :

- Easter day calculation rounding for the lunar correction when not using calendar extension
- added some phpunit test that checks cases that was incorrect before

src/Yasumi/Provider/ChristianHolidays.php

@@ -358,7 +358,7 @@ protected function calculateEaster(int $year, string $timezone): \DateTimeInterf
                 }
 
                 $solar = (int) (($year - 1600) / 100) - (int) (($year - 1600) / 400); // The solar correction
-                $lunar = (int) (($year - 1400) / 100 * 8 / 25); // The lunar correction
+                $lunar = (int) (((int) (($year - 1400) / 100) * 8) / 25); // The lunar correction
 
                 $pfm = (3 - (11 * $golden) + $solar - $lunar) % 30; // Uncorrected date of the Paschal full moon
             }

tests/Belgium/EasterTest.php

@@ -41,6 +41,13 @@ public function testEaster(): void
             $year,
             new \DateTime("{$year}-4-4", new \DateTimeZone(self::TIMEZONE))
         );
+        $year = 2025;
+        $this->assertHoliday(
+            self::REGION,
+            self::HOLIDAY,
+            $year,
+            new \DateTime("{$year}-4-20", new \DateTimeZone(self::TIMEZONE))
+        );
     }
 
     /**

tests/France/EasterMondayTest.php

@@ -41,6 +41,13 @@ public function testEasterMonday(): void
             $year,
             new \DateTime("{$year}-3-28", new \DateTimeZone(self::TIMEZONE))
         );
+        $year = 2025;
+        $this->assertHoliday(
+            self::REGION,
+            self::HOLIDAY,
+            $year,
+            new \DateTime("{$year}-4-21", new \DateTimeZone(self::TIMEZONE))
+        );
     }
 
     /**