[ADD] sudan public holidays

src/Countries/Sudan.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Sudan extends Country
+{
+    public function countryCode(): string
+    {
+        return 'sd';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            "New Year's  Day" => '01-01',
+            'Independence Day' => '01-01',
+            'Labour Day' => '05-01',
+            'Christmas Day' => '12-25'
+        ], $this->variableHolidays($year));
+    }
+
+    /**
+     * @return array<string, CarbonImmutable>
+     */
+    private function variableHolidays(int $year): array
+    {
+        return [];
+    }
+}

tests/Countries/SudanTest.php

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