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While I usually love my code to succeed, today I need to test it's failure. Using swift2.3, need a string that I could pass to 

dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)

and have it fail. I assume it can fail because it returns a optional.

Rob Bonner
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  • A conversion to NSUnicodeStringEncoding cannot fail. – Martin R Oct 31 '17 at 12:49
  • I updated the question. dataUsingEncoding returns an optional, why would that be if it always succeeds? – Rob Bonner Oct 31 '17 at 12:53
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    It depends on the encoding, compare https://stackoverflow.com/questions/46152617/can-the-conversion-of-a-string-to-data-with-utf-8-encoding-ever-fail. A conversion to "ISO Latin" or "Mac OS Roman" can fail because those encodings cannot represent all possible Unicode characters. – Martin R Oct 31 '17 at 13:05

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