196 lines
4.3 KiB
Markdown
196 lines
4.3 KiB
Markdown
# SSZ, generic tests
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This set of test-suites provides general testing for SSZ:
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to decode any container/list/vector/other type from binary data, encode it back, and compute the hash-tree-root.
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This test collection for general-purpose SSZ is experimental.
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The `ssz_static` suite is the required minimal support for SSZ, and should be prioritized.
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The `ssz_generic` tests are split up into different handler, each specialized into a SSZ type:
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- Vectors
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- `basic_vector`
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- `complex_vector` *not supported yet*
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- List
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- `basic_list` *not supported yet*
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- `complex_list` *not supported yet*
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- Bitfields
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- `bitvector`
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- `bitlist`
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- Basic types
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- `boolean`
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- `uints`
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- Containers
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- `containers`
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## Format
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For each type, a `valid` and an `invalid` suite is implemented.
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The cases have the same format, but those in the `invalid` suite only declare a subset of the data a test in the `valid` declares.
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Each of the handlers encodes the SSZ type declaration in the file-name. See [Type Declarations](#type-declarations).
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### `valid`
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Valid has 3 parts: `meta.yaml`, `serialized.ssz_snappy`, `value.yaml`
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### `meta.yaml`
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Valid ssz objects can have a hash-tree-root.
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The expected roots are encoded into the metadata yaml:
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```yaml
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root: Bytes32 -- Hash-tree-root of the object
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```
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The `Bytes32` is encoded as a string, hexadecimal encoding, prefixed with `0x`.
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### `serialized.ssz_snappy`
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The serialized form of the object, as snappy-compressed SSZ bytes.
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### `value.yaml`
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The object, encoded as a YAML structure. Using the same familiar encoding as YAML data in the other test suites.
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### Conditions
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The conditions are the same for each type:
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- Encoding: After encoding the given `value` object, the output should match `serialized`.
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- Decoding: After decoding the given `serialized` bytes, it should match the `value` object.
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- Hash-tree-root: the root should match the root declared in the metadata.
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## `invalid`
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Test cases in the `invalid` suite only include the `serialized.ssz_snappy`
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#### Condition
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Unlike the `valid` suite, invalid encodings do not have any `value` or hash tree root.
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The `serialized` data should simply not be decoded without raising an error.
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Note that for some type declarations in the invalid suite, the type itself may technically be invalid.
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This is a valid way of detecting `invalid` data too. E.g. a 0-length basic vector.
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## Type declarations
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Most types are not as static, and can reasonably be constructed during test runtime from the test case name.
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Formats are listed below.
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For each test case, an additional `_{extra...}` may be appended to the name,
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where `{extra...}` contains a human readable indication of the test case contents for debugging purposes.
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### `basic_vector`
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```
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Template:
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vec_{element type}_{length}
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Data:
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{element type}: bool, uint8, uint16, uint32, uint64, uint128, uint256
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{length}: an unsigned integer
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```
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### `bitlist`
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```
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Template:
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bitlist_{limit}
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Data:
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{limit}: the list limit, in bits, of the bitlist. Does not include the length-delimiting bit in the serialized form.
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```
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### `bitvector`
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```
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Template:
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bitvec_{length}
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Data:
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{length}: the length, in bits, of the bitvector.
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```
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### `boolean`
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A boolean has no type variations. Instead, file names just plainly describe the contents for debugging.
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### `uints`
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```
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Template:
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uint_{size}
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Data:
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{size}: the uint size: 8, 16, 32, 64, 128 or 256.
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```
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### `containers`
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Containers are more complicated than the other types. Instead, a set of pre-defined container structures is referenced:
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```
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Template:
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{container name}
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Data:
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{container name}: Any of the container names listed below (excluding the `(Container)` python super type)
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```
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```python
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class SingleFieldTestStruct(Container):
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A: byte
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class SmallTestStruct(Container):
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A: uint16
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B: uint16
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class FixedTestStruct(Container):
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A: uint8
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B: uint64
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C: uint32
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class VarTestStruct(Container):
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A: uint16
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B: List[uint16, 1024]
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C: uint8
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class ComplexTestStruct(Container):
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A: uint16
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B: List[uint16, 128]
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C: uint8
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D: Bytes[256]
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E: VarTestStruct
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F: Vector[FixedTestStruct, 4]
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G: Vector[VarTestStruct, 2]
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class BitsStruct(Container):
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A: Bitlist[5]
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B: Bitvector[2]
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C: Bitvector[1]
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D: Bitlist[6]
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E: Bitvector[8]
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```
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