Testing Graphics in a Testing Notebook

This is a similar issue to Testing Grids in a Testing Notebook and has the same solution: add a {SameTest -> (Rasterize[#1] == Rasterize[#2] &)}.

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Seems related to the issue raised in Testing equality of graphics.

Digging around using FullForm[]shows that the difference is a string-valued private tag

`Charting`Private`Tag$[random number]

Therefore, we may manually set that tag number to, say, 1 via a rule

nullRule = x_String /; StringMatchQ[x, "Charting`Private`Tag$*"] -> 
   "Charting`Private`Tag$1";

then the test runs okay:

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