Adam Szkoda d9f4819fe0 Alternative (to BeaconChainHarness) BeaconChain testing API (#1380) ... The PR: * Adds the ability to generate a crucial test scenario that isn't possible with `BeaconChainHarness` (i.e. two blocks occupying the same slot; previously forks necessitated skipping slots):  * New testing API: Instead of repeatedly calling add_block(), you generate a sorted `Vec<Slot>` and leave it up to the framework to generate blocks at those slots. * Jumping backwards to an earlier epoch is a hard error, so that tests necessarily generate blocks in a epoch-by-epoch manner. * Configures the test logger so that output is printed on the console in case a test fails. The logger also plays well with `--nocapture`, contrary to the existing testing framework * Rewrites existing fork pruning tests to use the new API * Adds a tests that triggers finalization at a non epoch boundary slot * Renamed `BeaconChainYoke` to `BeaconChainTestingRig` because the former has been too confusing * Fixed multiple tests (e.g. `block_production_different_shuffling_long`, `delete_blocks_and_states`, `shuffling_compatible_simple_fork`) that relied on a weird (and accidental) feature of the old `BeaconChainHarness` that attestations aren't produced for epochs earlier than the current one, thus masking potential bugs in test cases. Co-authored-by: Michael Sproul <michael@sigmaprime.io>		2020-08-26 09:24:55 +00:00
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tests.rs	Alternative (to BeaconChainHarness) BeaconChain testing API (#1380)	2020-08-26 09:24:55 +00:00