test: add Language helper tests

tests/Prime/Translation/LanguageTest.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the PHPFlasher package.
+ * (c) Younes KHOUBZA <younes.khoubza@gmail.com>
+ */
+
+namespace Flasher\Tests\Prime\Translation;
+
+use Flasher\Prime\Translation\Language;
+use Flasher\Tests\Prime\TestCase;
+
+class LanguageTest extends TestCase
+{
+    /**
+     * @return void
+     */
+    public function testLanguageDirection()
+    {
+        $this->assertEquals(Language::RTL, Language::direction('ar'));
+        $this->assertEquals(Language::LTR, Language::direction('fr'));
+        $this->assertEquals(Language::LTR, Language::direction('unknown'));
+    }
+
+    /**
+     * @return void
+     */
+    public function testIsRTL()
+    {
+        $this->assertTrue(Language::isRTL('ar_AE'));
+        $this->assertFalse(Language::isRTL('en_US'));
+    }
+
+    /**
+     * @return void
+     */
+    public function testIsLTR()
+    {
+        $this->assertTrue(Language::isLTR('en_US'));
+        $this->assertFalse(Language::isLTR('ar_AE'));
+    }
+}