ObjFW  Diff

	    @"-[substringFromIndex:toIndex:]", OFInvalidArgumentException,
	    [@"𝄞öö" substringFromIndex: 2
			       toIndex: 0])

	TEST(@"-[stringByAppendingString:]",
	    [[@"foo" stringByAppendingString: @"bar"] isEqual: @"foobar"])

	TEST(@"-[stringByPrependingString:]",
	    [[@"foo" stringByPrependingString: @"bar"] isEqual: @"barfoo"])

	TEST(@"-[hasPrefix:]", [@"foobar" hasPrefix: @"foo"] &&
	    ![@"foobar" hasPrefix: @"foobar0"])

	TEST(@"-[hasSuffix:]", [@"foobar" hasSuffix: @"bar"] &&
	    ![@"foobar" hasSuffix: @"foobar0"])

	i = 0;