151 lines
4.7 KiB
Markdown
151 lines
4.7 KiB
Markdown
# Test Harness
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Provides a testing environment for the `BeaconChain`, `Attester` and `BlockProposer` objects.
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This environment bypasses networking and client run-times and connects the `Attester` and `Proposer`
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directly to the `BeaconChain` via an `Arc`.
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The `BeaconChainHarness` contains a single `BeaconChain` instance and many `ValidatorHarness`
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instances. All of the `ValidatorHarness` instances work to advance the `BeaconChain` by
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producing blocks and attestations.
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The crate consists of a library and binary, examples for using both are
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described below.
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## YAML
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Both the library and the binary are capable of parsing tests from a YAML file,
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in fact this is the sole purpose of the binary.
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You can find YAML test cases [here](specs/). An example is included below:
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```yaml
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title: Validator Registry Tests
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summary: Tests deposit and slashing effects on validator registry.
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test_suite: validator_registry
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fork: tchaikovsky
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version: 1.0
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test_cases:
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- config:
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epoch_length: 64
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deposits_for_chain_start: 1000
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num_slots: 64
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skip_slots: [2, 3]
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deposits:
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# At slot 1, create a new validator deposit of 32 ETH.
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- slot: 1
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amount: 32
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# Trigger more deposits...
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- slot: 3
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amount: 32
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- slot: 5
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amount: 32
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proposer_slashings:
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# At slot 2, trigger a proposer slashing for validator #42.
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- slot: 2
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validator_index: 42
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# Trigger another slashing...
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- slot: 8
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validator_index: 13
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attester_slashings:
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# At slot 2, trigger an attester slashing for validators #11 and #12.
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- slot: 2
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validator_indices: [11, 12]
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# Trigger another slashing...
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- slot: 5
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validator_indices: [14]
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results:
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num_skipped_slots: 2
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states:
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- slot: 63
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num_validators: 1003
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slashed_validators: [11, 12, 13, 14, 42]
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exited_validators: []
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```
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Thanks to [prsym](http://github.com/prysmaticlabs/prysm) for coming up with the
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base YAML format.
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### Notes
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Wherever `slot` is used, it is actually the "slot height", or slots since
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genesis. This allows the tests to disregard the `GENESIS_EPOCH`.
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### Differences from Prysmatic's format
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1. The detail for `deposits`, `proposer_slashings` and `attester_slashings` is
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ommitted from the test specification. It assumed they should be valid
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objects.
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2. There is a `states` list in `results` that runs checks against any state
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specified by a `slot` number. This is in contrast to the variables in
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`results` that assume the last (highest) state should be inspected.
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#### Reasoning
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Respective reasonings for above changes:
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1. This removes the concerns of the actual object structure from the tests.
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This allows for more variation in the deposits/slashings objects without
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needing to update the tests. Also, it makes it makes it easier to create
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tests.
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2. This gives more fine-grained control over the tests. It allows for checking
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that certain events happened at certain times whilst making the tests only
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slightly more verbose.
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_Notes: it may be useful to add an extra field to each slashing type to
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indicate if it should be valid or not. It also may be useful to add an option
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for double-vote/surround-vote attester slashings. The `amount` field was left
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on `deposits` as it changes the behaviour of state significantly._
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## Binary Usage Example
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Follow these steps to run as a binary:
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1. Navigate to the root of this crate (where this readme is located)
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2. Run `$ cargo run --release -- --yaml examples/validator_registry.yaml`
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_Note: the `--release` flag builds the binary without all the debugging
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instrumentation. The test is much faster built using `--release`. As is
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customary in cargo, the flags before `--` are passed to cargo and the flags
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after are passed to the binary._
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### CLI Options
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```
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Lighthouse Test Harness Runner 0.0.1
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Sigma Prime <contact@sigmaprime.io>
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Runs `test_harness` using a YAML test_case.
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USAGE:
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test_harness --log-level <LOG_LEVEL> --yaml <FILE>
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FLAGS:
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-h, --help Prints help information
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-V, --version Prints version information
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OPTIONS:
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--log-level <LOG_LEVEL> Logging level. [default: debug] [possible values: error, warn, info, debug, trace]
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--yaml <FILE> YAML file test_case.
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```
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## Library Usage Example
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```rust
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use test_harness::BeaconChainHarness;
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use types::ChainSpec;
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let validator_count = 8;
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let spec = ChainSpec::few_validators();
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let mut harness = BeaconChainHarness::new(spec, validator_count);
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harness.advance_chain_with_block();
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let chain = harness.chain_dump().unwrap();
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// One block should have been built on top of the genesis block.
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assert_eq!(chain.len(), 2);
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```
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