Slovenian holidays (#3)

* Added Slovenian holidays.
* Created tests for Slovenian holidays.

.gitignore

@@ -3,3 +3,4 @@ composer.lock
 /vendor/
 /coverage/
 /.idea/
+/.vscode/

src/Cmixin/Holidays/sl-national.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Slovenian holidays.
+ *
+ * Days that are commented are holidays, but not work-free-days.
+ * Source: http://www.vlada.si/o_sloveniji/politicni_sistem/prazniki/
+ */
+return array(
+    '01/01', // novo leto
+    '02/01', // novo leto
+    '08/02', // Prešernov dan, slovenski kulturni praznik
+    '27/04', // dan upora proti okupatorju
+    '01/05', // praznik dela
+    '02/05', // praznik dela
+//  '08/06', // dan Primoža Trubarja
+    '25/06', // dan državnosti
+    '15/08', // Marijino vnebovzetje
+//  '17/08', // združitev prekmurskih Slovencev z matičnim narodom
+//  '15/09', // vrnitev Primorske k matični domovini
+//  '25/10', // dan suverenosti
+    '31/10', // dan reformacije
+    '01/11', // dan spomina na mrtve
+//  '23/11', // dan Rudolfa Maistra
+    '25/12', // božič
+    '26/12', // dan samostojnosti in enotnosti
+
+    function ($year) { // velika noč
+        $days = easter_days($year);
+        $date = new DateTime("$year-03-21 +$days days");
+
+        return $date->format('d/m');
+    },
+    function ($year) { // velikonočni ponedeljek
+        $days = easter_days($year) + 1;
+        $date = new DateTime("$year-03-21 +$days days");
+
+        return $date->format('d/m');
+    },
+    function ($year) { // binkoštna nedelja - binkošti
+        $days = easter_days($year) + 49;
+        $date = new DateTime("$year-03-21 +$days days");
+
+        return $date->format('d/m');
+    },
+);

tests/Cmixin/Holidays/SlTest.php

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+<?php
+
+namespace Tests\Cmixin\Holidays;
+
+use Cmixin\BusinessDay;
+use PHPUnit\Framework\TestCase;
+
+class SlTest extends TestCase
+{
+    const CARBON_CLASS = 'Carbon\Carbon';
+
+    protected function setUp()
+    {
+        BusinessDay::enable(static::CARBON_CLASS);
+        $carbon = static::CARBON_CLASS;
+        $carbon::resetHolidays();
+    }
+
+    public function testHolidays()
+    {
+        $carbon = static::CARBON_CLASS;
+        $carbon::setHolidaysRegion('sl-national');
+        $holidays = include __DIR__.'/../../../src/Cmixin/Holidays/sl-national.php';
+
+        $randomYear = rand(1991, 2028);
+        $randomHolidays = array();
+        foreach ($holidays as $holiday) {
+            if (is_callable($holiday)) {
+                $randomHolidays[] = $holiday($randomYear);
+            } elseif (is_string($holiday)) {
+                $randomHolidays[] = $holiday;
+            }
+        }
+
+        $date = $carbon::parse("$randomYear-01-01");
+        while ($date->format('Y') == $randomYear) {
+            if (in_array($date->format('d/m'), $randomHolidays)) {
+                self::assertTrue($date->isHoliday(), sprintf('Date %s should be holiday!', $date->format('Y-m-d')));
+            } else {
+                self::assertFalse($date->isHoliday(), sprintf('Date %s should not be holiday!', $date->format('Y-m-d')));
+            }
+
+            $date->modify('+1 day');
+        }
+    }
+}