add indonesia holiday (#66)

* add indonesia holiday

* (fix): remove docblock

* fix(test): variable holidays

* fix(docblock): variableHolidays docblock

* refactor(variableHolidays): get easter date from the parent class

* fix(variableHolidays): easter date

* feat(holiday): add chinese new year holiday to indonesia

* fix(IndonesiaTest)

src/Countries/Indonesia.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Calendars\ChineseCalendar;
+
+class Indonesia extends Country
+{
+    use ChineseCalendar;
+
+    public function countryCode(): string
+    {
+        return 'id';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Tahun Baru' => '01-01',
+            'Hari Buruh Internasional' => '05-01',
+            'Hari Lahir Pancasila' => '06-01',
+            'Hari Kemerdekaan' => '08-17',
+            'Hari Raya Natal' => '12-25',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = $this->easter($year);
+
+        return [
+            'Tahun Baru Imlek' => $this->chineseToGregorianDate('01-01', $year),
+            'Jumat Agung' => $easter->subDays(2),
+            'Hari Paskah' => $easter,
+            'Kenaikan Yesus Kristus' => $easter->addDays(39),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/IndonesiaTest/it_can_calculate_indonesia_holidays.snap

@@ -0,0 +1,38 @@
+[
+    {
+        "name": "Tahun Baru",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Tahun Baru Imlek",
+        "date": "2024-02-10"
+    },
+    {
+        "name": "Jumat Agung",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "Hari Paskah",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Hari Buruh Internasional",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Kenaikan Yesus Kristus",
+        "date": "2024-05-09"
+    },
+    {
+        "name": "Hari Lahir Pancasila",
+        "date": "2024-06-01"
+    },
+    {
+        "name": "Hari Kemerdekaan",
+        "date": "2024-08-17"
+    },
+    {
+        "name": "Hari Raya Natal",
+        "date": "2024-12-25"
+    }
+]

tests/Countries/IndonesiaTest.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate Indonesia holidays', function () {
+    CarbonImmutable::setTestNow('2024-01-01');
+
+    $holidays = Holidays::for(country: 'id')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});