Added compute_strain_rate_and_derivative to ConstantViscosityPrefactors, with unit test #3800
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This PR adds a compute_strain_rate_and_derivative function to the ConstantViscosityPrefactors rheology module.
It also adds a new test, rheology_checker.prm, that is essentially a unit tester for otherwise hard-to-reach functions within the rheology module. I intend to add to this test as I add compute_strain_rate_and_derivative to more rheology plugins.
This PR is a continuation of the quest started in #3759.