I haven't seen one.
Even if there was one, it would not be a reliable gauge of how well it supports the standard.
eReaders tend to go off track a bit and do their own thing, never really 100% supporting the standard.
Remembering that the css used in ebooks is only a small subset of the full css specification. epub3 compliant readers may, or may not, support the various style definitions. What code will work in one or two ereaders, may not work in others.
As for your page-break issue, maybe you are using deprecated code?
page-break-after is deprecated
break-after is current code.
But epub3 ereaders may not use break-after, like the Libra2
Essentially it is a mine-field, and the only way to know what works and what doesn't is to test on the ereader itself.
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