Raise "runnable.SkipException" when a mamba test should be skipped.
Raise "runnable.SkipException" when a mamba test should be skipped.

Used to implement sampled tests.

PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge