I don't know of any reader that supports everything covered by the ePub 2 standard (yes, this is a dire state of affairs). I've attached an ePub that can be used to test a few things that readers commonly get wrong or fail to support. Don't expect anything to cover the whole Unicode range, but if you get anything beyond Latin-1 Supplement count yourself lucky. This test is very limited, though, it only covers a few things that are common problems with ereaders.
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