For testing JuliaDiff/ChainRules.jl#644, it would be useful if we could have a variant of TestConfig() which only works in forward mode, and one which only works in reverse mode. This would ensure that tests of one possibility don't get upgraded to test the other.
For testing JuliaDiff/ChainRules.jl#644, it would be useful if we could have a variant of
TestConfig()which only works in forward mode, and one which only works in reverse mode. This would ensure that tests of one possibility don't get upgraded to test the other.