Isn't the main point of tests to be poison pills for people writing compilers so they can ensure any shaders passed to the compiler don't break it? I.e. it's no

Isn't the main point of tests to be poison pills for people writing compilers so they can ensure any shaders passed to the compiler don't break it? I.e. it's not that the specific code is useful as is in practice but if a chunk of a shader ends up functionally simplifying to something like this in a particular instance your shader compiler still needs to handle it right even though it could be written better at that point.