eth2.0-specs/specs/test_formats/sanity/slots.md

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# Sanity slots testing
Sanity tests to cover a series of one or more empty-slot transitions being processed, aiming to cover common changes.
## Test case format
```yaml
description: string -- description of test case, purely for debugging purposes
bls_setting: int -- see general test-format spec.
pre: BeaconState -- state before running through the transitions.
slots: N -- amount of slots to process, N being a positive number.
post: BeaconState -- state after applying all the transitions.
```
The transition with pure time, no blocks, is known as `state_transition_to(state, slot)` in the spec.
This runs state-caching (pure slot transition) and epoch processing (every E slots).
To process the data, call `state_transition_to(pre, pre.slot + N)`. And see if `pre` mutated into the equivalent of `post`.
## Condition
The resulting state should match the expected `post` state.