Add Estonian holidays (#47)

* Add Estonian holidays

* Use easter() method for easter date

src/Countries/Estonia.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Estonia extends Country
+{
+    public function countryCode(): string
+    {
+        return 'ee';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Uusaasta' => '01-01',
+            'Iseseisvuspäev' => '02-24',
+            'Kevadpüha' => '05-01',
+            'Võidupüha' => '06-23',
+            'Jaanipäev' => '06-24',
+            'Taasiseseisvumispäev' => '08-20',
+            'Jõululaupäev' => '12-24',
+            'Esimene jõulupüha' => '12-25',
+            'Teine jõulupüha' => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = $this->easter($year);
+
+        return [
+            'Suur reede' => $easter->subDays(2),
+            'Ülestõusmispühade 1. püha' => $easter,
+            'Nelipühade 1. püha' => $easter->addDays(49),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/EstoniaTest/it_can_calculate_estonian_holidays.snap

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+[
+    {
+        "name": "Uusaasta",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Iseseisvusp\u00e4ev",
+        "date": "2024-02-24"
+    },
+    {
+        "name": "Suur reede",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "\u00dclest\u00f5usmisp\u00fchade 1. p\u00fcha",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Kevadp\u00fcha",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Nelip\u00fchade 1. p\u00fcha",
+        "date": "2024-05-19"
+    },
+    {
+        "name": "V\u00f5idup\u00fcha",
+        "date": "2024-06-23"
+    },
+    {
+        "name": "Jaanip\u00e4ev",
+        "date": "2024-06-24"
+    },
+    {
+        "name": "Taasiseseisvumisp\u00e4ev",
+        "date": "2024-08-20"
+    },
+    {
+        "name": "J\u00f5ululaup\u00e4ev",
+        "date": "2024-12-24"
+    },
+    {
+        "name": "Esimene j\u00f5ulup\u00fcha",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Teine j\u00f5ulup\u00fcha",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/EstoniaTest.php

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+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate estonian holidays', function () {
+    CarbonImmutable::setTestNowAndTimezone('2024-01-01', 'Europe/Tallinn');
+
+    $holidays = Holidays::for(country: 'ee')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});