Update tests

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

tests/Utility/LanguageTest.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jfcherng\Diff\Utility\Test;
+
+use Jfcherng\Diff\Exception\FileNotFoundException;
+use Jfcherng\Diff\Utility\Language;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @coversNothing
+ */
+class LanguageTest extends TestCase
+{
+    /**
+     * The Language object.
+     *
+     * @var \Jfcherng\Diff\Utility\Language
+     */
+    protected $languageObj;
+
+    /**
+     * Set up the test environment.
+     */
+    protected function setUp(): void
+    {
+        $this->languageObj = new Language('eng');
+    }
+
+    /**
+     * Test the Language::setLanguageOrTranslations.
+     *
+     * @covers \Jfcherng\Diff\Utility\Language::setLanguageOrTranslations
+     */
+    public function testSetLanguageOrTranslations(): void
+    {
+        $this->languageObj->setLanguageOrTranslations('eng');
+        $this->assertArrayHasKey(
+            'differences',
+            $this->languageObj->getTranslations()
+        );
+
+        $this->languageObj->setLanguageOrTranslations(['hahaha' => '哈哈哈']);
+        $this->assertArrayHasKey(
+            'hahaha',
+            $this->languageObj->getTranslations()
+        );
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->languageObj->setLanguageOrTranslations(5);
+    }
+
+    /**
+     * Test the Language::getTranslationsByLanguage.
+     *
+     * @covers \Jfcherng\Diff\Utility\Language::getTranslationsByLanguage
+     */
+    public function testGetTranslationsByLanguage(): void
+    {
+        $this->assertArrayHasKey(
+            'differences',
+            $this->languageObj->getTranslationsByLanguage('eng')
+        );
+
+        $this->expectException(FileNotFoundException::class);
+        $this->languageObj->getTranslationsByLanguage('a_non_existing_language');
+    }
+
+    /**
+     * Test the Language::translate.
+     *
+     * @covers \Jfcherng\Diff\Utility\Language::translate
+     */
+    public function testTranslate(): void
+    {
+        $this->assertSame(
+            'Differences',
+            $this->languageObj->translate('differences')
+        );
+
+        $this->assertStringMatchesFormat(
+            '![%s]',
+            $this->languageObj->translate('a_non_existing_translation')
+        );
+    }
+}