NYP: added Pakistani holidays and test case

src/Countries/Pakistan.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Pakistan extends Country
+{
+    /**
+     * Country Code
+     *
+     * @return string
+     */
+    public function countryCode(): string
+    {
+        return 'pk';
+    }
+
+    /**
+     * All Holiday In Country
+     *
+     * @param integer $year
+     * 
+     * @return array<string, CarbonImmutable|string>
+     */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Kashmir Solidarity Day'    => '02-05',
+            'Pakistan Resolution Day'   => '03-23',
+            'Labour Day'                => '05-01',
+            'Independence Day'          => '08-14',
+            'Defence Day'               => '06-06',
+            'Iqbal Day'                 => '11-09',
+            'Quaid-e-Azam Day'          => '12-25',
+        ], $this->variableHolidays($year));
+    }
+
+    /**
+     *  
+     * @return array<string, CarbonImmutable> 
+     * */
+    protected function variableHolidays(int $year): array
+    {
+        // As Islamic holidays are lunar based.
+        // https://github.com/spatie/holidays/discussions/79
+
+        return [
+            //
+        ];
+    }
+}

tests/.pest/snapshots/Countries/PakistanTest/it_can_calculate_pakistani_holidays.snap

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+[
+    {
+        "name": "Kashmir Solidarity Day",
+        "date": "2024-02-05"
+    },
+    {
+        "name": "Pakistan Resolution Day",
+        "date": "2024-03-23"
+    },
+    {
+        "name": "Labour Day",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Defence Day",
+        "date": "2024-06-06"
+    },
+    {
+        "name": "Independence Day",
+        "date": "2024-08-14"
+    },
+    {
+        "name": "Iqbal Day",
+        "date": "2024-11-09"
+    },
+    {
+        "name": "Quaid-e-Azam Day",
+        "date": "2024-12-25"
+    }
+]

tests/Countries/PakistanTest.php

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