StringUtilsTest.php

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<?php
 
class StringUtilsTest extends PHPUnit_Framework_TestCase {
 
    public function testIsUtf8( $expected, $string ) {
        $this->assertEquals( $expected, StringUtils::isUtf8( $string ),
            'Testing string "' . $this->escaped( $string ) . '"' );
    }
 
    function escaped( $string ) {
        $escaped = '';
        $length = strlen( $string );
        for ( $i = 0; $i < $length; $i++ ) {
            $char = $string[$i];
            $val = ord( $char );
            if ( $val > 127 ) {
                $escaped .= '\x' . dechex( $val );
            } else {
                $escaped .= $char;
            }
        }
 
        return $escaped;
    }
 
    public static function provideStringsForIsUtf8Check() {
        // Expected return values for StringUtils::isUtf8()
        $PASS = true;
        $FAIL = false;
 
        return [
            'some ASCII' => [ $PASS, 'Some ASCII' ],
            'euro sign' => [ $PASS, "Euro sign €" ],
 
            'first possible sequence 1 byte' => [ $PASS, "\x00" ],
            'first possible sequence 2 bytes' => [ $PASS, "\xc2\x80" ],
            'first possible sequence 3 bytes' => [ $PASS, "\xe0\xa0\x80" ],
            'first possible sequence 4 bytes' => [ $PASS, "\xf0\x90\x80\x80" ],
            'first possible sequence 5 bytes' => [ $FAIL, "\xf8\x88\x80\x80\x80" ],
            'first possible sequence 6 bytes' => [ $FAIL, "\xfc\x84\x80\x80\x80\x80" ],
 
            'last possible sequence 1 byte' => [ $PASS, "\x7f" ],
            'last possible sequence 2 bytes' => [ $PASS, "\xdf\xbf" ],
            'last possible sequence 3 bytes' => [ $PASS, "\xef\xbf\xbf" ],
            'last possible sequence 4 bytes (U+1FFFFF)' => [ $FAIL, "\xf7\xbf\xbf\xbf" ],
            'last possible sequence 5 bytes' => [ $FAIL, "\xfb\xbf\xbf\xbf\xbf" ],
            'last possible sequence 6 bytes' => [ $FAIL, "\xfd\xbf\xbf\xbf\xbf\xbf" ],
 
            'boundary 1' => [ $PASS, "\xed\x9f\xbf" ],
            'boundary 2' => [ $PASS, "\xee\x80\x80" ],
            'boundary 3' => [ $PASS, "\xef\xbf\xbd" ],
            'boundary 4' => [ $PASS, "\xf2\x80\x80\x80" ],
            'boundary 5 (U+FFFFF)' => [ $PASS, "\xf3\xbf\xbf\xbf" ],
            'boundary 6 (U+100000)' => [ $PASS, "\xf4\x80\x80\x80" ],
            'boundary 7 (U+10FFFF)' => [ $PASS, "\xf4\x8f\xbf\xbf" ],
            'boundary 8 (U+110000)' => [ $FAIL, "\xf4\x90\x80\x80" ],
 
            'malformed 1' => [ $FAIL, "\x80" ],
            'malformed 2' => [ $FAIL, "\xbf" ],
            'malformed 3' => [ $FAIL, "\x80\xbf" ],
            'malformed 4' => [ $FAIL, "\x80\xbf\x80" ],
            'malformed 5' => [ $FAIL, "\x80\xbf\x80\xbf" ],
            'malformed 6' => [ $FAIL, "\x80\xbf\x80\xbf\x80" ],
            'malformed 7' => [ $FAIL, "\x80\xbf\x80\xbf\x80\xbf" ],
            'malformed 8' => [ $FAIL, "\x80\xbf\x80\xbf\x80\xbf\x80" ],
 
            'last byte missing 1' => [ $FAIL, "\xc0" ],
            'last byte missing 2' => [ $FAIL, "\xe0\x80" ],
            'last byte missing 3' => [ $FAIL, "\xf0\x80\x80" ],
            'last byte missing 4' => [ $FAIL, "\xf8\x80\x80\x80" ],
            'last byte missing 5' => [ $FAIL, "\xfc\x80\x80\x80\x80" ],
            'last byte missing 6' => [ $FAIL, "\xdf" ],
            'last byte missing 7' => [ $FAIL, "\xef\xbf" ],
            'last byte missing 8' => [ $FAIL, "\xf7\xbf\xbf" ],
            'last byte missing 9' => [ $FAIL, "\xfb\xbf\xbf\xbf" ],
            'last byte missing 10' => [ $FAIL, "\xfd\xbf\xbf\xbf\xbf" ],
 
            'extra continuation byte 1' => [ $FAIL, "e\xaf" ],
            'extra continuation byte 2' => [ $FAIL, "\xc3\x89\xaf" ],
            'extra continuation byte 3' => [ $FAIL, "\xef\xbc\xa5\xaf" ],
            'extra continuation byte 4' => [ $FAIL, "\xf0\x9d\x99\xb4\xaf" ],
 
            'impossible bytes 1' => [ $FAIL, "\xfe" ],
            'impossible bytes 2' => [ $FAIL, "\xff" ],
            'impossible bytes 3' => [ $FAIL, "\xfe\xfe\xff\xff" ],
 
            'overlong sequences 1' => [ $FAIL, "\xc0\xaf" ],
            'overlong sequences 2' => [ $FAIL, "\xc1\xaf" ],
            'overlong sequences 3' => [ $FAIL, "\xe0\x80\xaf" ],
            'overlong sequences 4' => [ $FAIL, "\xf0\x80\x80\xaf" ],
            'overlong sequences 5' => [ $FAIL, "\xf8\x80\x80\x80\xaf" ],
            'overlong sequences 6' => [ $FAIL, "\xfc\x80\x80\x80\x80\xaf" ],
 
            'maximum overlong sequences 1' => [ $FAIL, "\xc1\xbf" ],
            'maximum overlong sequences 2' => [ $FAIL, "\xe0\x9f\xbf" ],
            'maximum overlong sequences 3' => [ $FAIL, "\xf0\x8f\xbf\xbf" ],
            'maximum overlong sequences 4' => [ $FAIL, "\xf8\x87\xbf\xbf" ],
            'maximum overlong sequences 5' => [ $FAIL, "\xfc\x83\xbf\xbf\xbf\xbf" ],
 
            'surrogates 1 (U+D799)' => [ $PASS, "\xed\x9f\xbf" ],
            'surrogates 2 (U+E000)' => [ $PASS, "\xee\x80\x80" ],
            'surrogates 3 (U+D800)' => [ $FAIL, "\xed\xa0\x80" ],
            'surrogates 4 (U+DBFF)' => [ $FAIL, "\xed\xaf\xbf" ],
            'surrogates 5 (U+DC00)' => [ $FAIL, "\xed\xb0\x80" ],
            'surrogates 6 (U+DFFF)' => [ $FAIL, "\xed\xbf\xbf" ],
            'surrogates 7 (U+D800 U+DC00)' => [ $FAIL, "\xed\xa0\x80\xed\xb0\x80" ],
 
            'noncharacters 1' => [ $PASS, "\xef\xbf\xbe" ],
            'noncharacters 2' => [ $PASS, "\xef\xbf\xbf" ],
        ];
    }
}