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Q. I'd like to refer a file in the build root in the test cases executed via `python_tests()` target.
It seems that `%(buildroot)s` expansion is not working in BUILD files. How could I achieve a similar thing?
e.g.,
```python_tests(
    name="tests",
    extra_env_vars=[
        "BACKEND_CONFIG_FILE=%(buildroot)s/manager.toml",
    ],
)```

Ah.. maybe another way to do this is to make `manager.toml` as an explicit resource file as a dependency of `python_tests()`.

and also I encountered another problem with testing codes that tries to read package metadata (entrypoints) ...

BUILD files are not copied into the src directory inside the pex environment generated for running pytest...

made an issue for the entrypoint: <https://github.com/pantsbuild/pants/issues/15481>

Tried `runtime_package_dependencies` but it seems not working as well..

You'll want to declare the toml file as a `file`, and then declare the dependency from your test to the `file`