Even without the continuation piece, it has always puzzled me why the test frameworks that I've used (mostly pytest and catch) don't explicitly model dependenci

Even without the continuation piece, it has always puzzled me why the test frameworks that I've used (mostly pytest and catch) don't explicitly model dependencies between layers. Especially in a system where layers have been carefully levelized. Assuming for the sake of example that there are no mocks involved, if subsystem B depends on subsystem A (say A is some global utility classes), then I would want all of A's unit tests to pass before running any of subsystem B's tests. Not sure why this is absent, or perhaps I'm using the wrong test systems.