public function testRemoveNonPrintableAsciiChars() { $stringWithAllAsciiChars = ""; for ($i = 0; $i < 256; $i++) { $stringWithAllAsciiChars .= chr($i); } $stringWithOnlyPrintableChars = Encoding::toPrintableAscii($stringWithAllAsciiChars); $this->assertEquals(224, strlen($stringWithOnlyPrintableChars)); }