fix(belgium): correct nationalDay translations and rename PentecostMondayTest

- Capitalise Dutch translation of nationalDay: 'Nationale feestdag'
- Add German translation for nationalDay: 'Nationalfeiertag'
- Rename pentecostMondayTest -> PentecostMondayTest (file and class)
  for consistency with all other Belgium test files

Signed-off-by: Sacha Telgenhof <me@sachatelgenhof.com>

Author: stelgenhof

src/Yasumi/Provider/Belgium.php

@@ -66,9 +66,10 @@ public function initialize(): void
          * Belgian National Day is the National Day of Belgium celebrated on 21 July each year.
          */
         $this->addHoliday(new Holiday('nationalDay', [
-            'fr' => 'Fête nationale',
+            'de' => 'Nationalfeiertag',
             'en' => 'Belgian National Day',
-            'nl' => 'nationale feestdag',
+            'fr' => 'Fête nationale',
+            'nl' => 'Nationale feestdag',
         ], new \DateTime("{$this->year}-7-21", DateTimeZoneFactory::getDateTimeZone($this->timezone)), $this->locale));
     }
 

tests/Belgium/NationalDayTest.php

@@ -65,7 +65,7 @@ public function testTranslation(): void
             self::REGION,
             self::HOLIDAY,
             static::generateRandomYear(),
-            [self::LOCALE => 'nationale feestdag']
+            [self::LOCALE => 'Nationale feestdag']
         );
     }
 

tests/Belgium/pentecostMondayTest.php tests/Belgium/PentecostMondayTest.phptests/Belgium/pentecostMondayTest.php renamed to tests/Belgium/PentecostMondayTest.php

@@ -23,7 +23,7 @@
 /**
  * Class for testing Pentecost Monday in Belgium.
  */
-class pentecostMondayTest extends BelgiumBaseTestCase implements HolidayTestCase
+class PentecostMondayTest extends BelgiumBaseTestCase implements HolidayTestCase
 {
     /**
      * The name of the holiday to be tested.