eth2.0-specs/tests/formats/bls/aggregate.md

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# Test format: BLS signature aggregation
A BLS signature aggregation combines a series of signatures into a single signature.
## Test case format
The test data is declared in a `data.yaml` file:
```yaml
input: List[BLS Signature] -- list of input BLS signatures
output: BLS Signature -- expected output, single BLS signature or empty.
```
- `BLS Signature` here is encoded as a string: hexadecimal encoding of 96 bytes (192 nibbles), prefixed with `0x`.
- No output value if the input is invalid.
All byte(s) fields are encoded as strings, hexadecimal encoding, prefixed with `0x`.
## Condition
The `aggregate` handler should aggregate the signatures in the `input`, and the result should match the expected `output`.