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

    public function testExtractKatakanaWithLengthEqualsOneWhenMixed()
    {
        $result = Helper::extractKatakana($this->mixCharacters, 1);
        $this->assertSame(array('ジ', 'ョ', 'オ'), $result);
    }