[Mobilespec] atob function on file.spec 85 & 92, is ignored during test

The atob function that decodes a string for the file spec 85 and 92 it's been completely ignored during the test execution.
The returned object from the runReaderTest function it should returns an encoded string content from the a file, how ever in the expectation statement it tries to decode it and compare it with an encoded one, which it doesn't make sense.
Even so, that specific operation which compares the encoded string with the javascript atob function to encode a string it is completely ignored during the execution, it just continues with the next line and so.

The problem is that the fileData string that it is trying to decode it contains Unicode characters and it cannot handle those characters.
I've tried with the other function btoa, but it also throws a error, it is problem about the Unicode caracters.