Dmitry Gozman 0ce8efab7b
test: rework testrunner workers (#1296)
This change introduces a TestWorker that can be in a certain state,
meaning it has run some beforeAll hooks of a certain test suite stack.

TestWorker can be created at any time, which allows for a number of features:
- don't run hooks for suites with no runnable tests;
- smarter test distribution (and possibility for variuos strategies);
- recovering from hook failures and test failure by creating a new worker;
- possible isolation between workers by running them in separate environments.
2020-03-10 11:30:02 -07:00
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