Add Czech holidays (#22)

* add: czech holidays

* add: czechia test

* remove: docblock

---------

Co-authored-by: Vojtech Rerabek <vrerabek@Vojtech-Air.docsis.vodafone.cz>

src/Countries/Czechia.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Czechia extends Country
+{
+    public function countryCode(): string
+    {
+        return 'cz';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Den obnovy samostatného českého státu' => '01-01',
+            'Svátek práce' => '05-01',
+            'Den vítězství' => '05-08',
+            'Den slovanských věrozvěstů Cyrila a Metoděje' => '07-05',
+            'Den upálení mistra Jana Husa' => '07-06',
+            'Den české státnosti' => '09-28',
+            'Den vzniku samostatného československého státu' => '10-28',
+            'Den boje za svobodu a demokracii a Mezinárodní den studentstva' => '11-17',
+            'Štědrý den' => '12-24',
+            '1. svátek vánoční' => '12-25',
+            '2. svátek vánoční' => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Europe/Prague');
+
+        return [
+            'Velikonoční pondělí' => $easter->addDay(),
+            'Velký pátek' => $easter->subDays(2),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/CzechiaTest/it_can_calculate_czech_holidays.snap

@@ -0,0 +1,54 @@
+[
+    {
+        "name": "Den obnovy samostatn\u00e9ho \u010desk\u00e9ho st\u00e1tu",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Velk\u00fd p\u00e1tek",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "Velikono\u010dn\u00ed pond\u011bl\u00ed",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "Sv\u00e1tek pr\u00e1ce",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Den v\u00edt\u011bzstv\u00ed",
+        "date": "2024-05-08"
+    },
+    {
+        "name": "Den slovansk\u00fdch v\u011brozv\u011bst\u016f Cyrila a Metod\u011bje",
+        "date": "2024-07-05"
+    },
+    {
+        "name": "Den up\u00e1len\u00ed mistra Jana Husa",
+        "date": "2024-07-06"
+    },
+    {
+        "name": "Den \u010desk\u00e9 st\u00e1tnosti",
+        "date": "2024-09-28"
+    },
+    {
+        "name": "Den vzniku samostatn\u00e9ho \u010deskoslovensk\u00e9ho st\u00e1tu",
+        "date": "2024-10-28"
+    },
+    {
+        "name": "Den boje za svobodu a demokracii a Mezin\u00e1rodn\u00ed den studentstva",
+        "date": "2024-11-17"
+    },
+    {
+        "name": "\u0160t\u011bdr\u00fd den",
+        "date": "2024-12-24"
+    },
+    {
+        "name": "1. sv\u00e1tek v\u00e1no\u010dn\u00ed",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "2. sv\u00e1tek v\u00e1no\u010dn\u00ed",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/CzechiaTest.php

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