JpnForPhp\Tests\Helper\HelperTest::testConvertHiraganaToKatakanaWhenMixCharacters PHP Method

    public function testConvertHiraganaToKatakanaWhenMixCharacters()
    {
        $result = Helper::convertHiraganaToKatakana($this->mixCharacters);
        $this->assertEquals('今日、Joo「ジョオ」ハ学校ニイマス。', $result);
    }