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

    public function testExtractKatakanaWithLengthEqualsOneWhenKatakanaOnly()
    {
        $result = Helper::extractKatakana($this->katakanaCharacters, 1);
        $this->assertEquals(array('カ', 'タ', 'カ', 'ナ'), $result);
    }