Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-49137261
@dbtsai The assertions with `===` were all tested to work, but I agree it
is more robust to allow numerical errors. One downside of this change is that
`===` reports the values in comparison when something is wrong but now
`almostEquals` only returns true/false. It would be great if we can make the
implementation similar to `===`.
Btw, Scalatest 2.x has this tolerance feature, where you can use `+-` to
indicate a range. We are not using Scalatest 2.x but it is a useful feature.
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