49 lines
2.5 KiB
Markdown
49 lines
2.5 KiB
Markdown
# ETH 2.0 test generator helpers
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## `gen_base`
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A util to quickly write new test suite generators with.
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See [Generators documentation](../../test_generators/README.md) for integration details.
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Options:
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```
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-o OUTPUT_DIR -- Output directory to write tests to. The directory must exist.
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This directory will hold the top-level test directories (per-config directories).
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[-f] -- Optional. Force-run the generator: if false, existing test case folder will be detected,
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and the test generator will not run the function to generate the test case with.
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If true, all cases will run regardless, and files will be overwritten.
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Other existing files are not deleted.
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-c CONFIGS_PATH -- The directory to load configs for pyspec from. A config is a simple key-value yaml file.
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Use `../../configs/` when running from the root dir of a generator, and requiring the standard spec configs.
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[-l [CONFIG_LIST [CONFIG_LIST ...]]] -- Optional. Define which configs to run.
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Test providers loading other configs will be ignored. If none are specified, no config will be ignored.
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```
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`gen_from_tests`: A util to derive tests from a tests source file.
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This requires the tests to yield test-case-part outputs. These outputs are then written to the test case directory.
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Yielding data is illegal in normal pytests, so it is only done when in "generator mode".
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This functionality can be attached to any function by using the `vector_test()` decorator found in `ethspec/tests/utils.py`.
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The yielding pattern is:
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2 value style: `yield <key name> <value>`. The kind of output will be inferred from the value by the `vector_test()` decorator.
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3 value style: `yield <key name> <kind name> <value>`.
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Test part output kinds:
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- `ssz`: value is expected to be a `bytes`, and the raw data is written to a `<key name>.ssz` file.
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- `data`: value is expected to be any python object that can be dumped as YAML. Output is written to `<key name>.yaml`
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- `meta`: these key-value pairs are collected into a dict, and then collectively written to a metadata
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file named `meta.yaml`, if anything is yielded with `meta` empty.
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The `vector_test()` decorator can detect pyspec SSZ types, and output them both as `data` and `ssz`, for the test consumer to choose.
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Note that the yielded outputs are processed before the test continues. It is safe to yield information that later mutates,
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as the output will already be encoded to yaml or ssz bytes. This avoids the need to deep-copy the whole object.
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