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Add OsSystem support to mdtests (#16518)

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## Summary

This PR introduces a new mdtest option `system` that can either be
`in-memory` or `os`
where `in-memory` is the default.

The motivation for supporting `os` is so that we can write OS/system
specific tests
with mdtests. Specifically, I want to write mdtests for the module
resolver,
testing that module resolution is case sensitive. 

## Test Plan

I tested that the case-sensitive module resolver test start failing when
setting `system = "os"`
This commit is contained in:
Micha Reiser 2025-03-06 09:41:40 +00:00 • committed by GitHub
parent 48f906e06c
commit ce0018c3cb
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31 changed files with 541 additions and 229 deletions
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4
fuzz/fuzz_targets/red_knot_check_invalid_syntax.rs
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@ -14,7 +14,9 @@ use red_knot_python_semantic::{
PythonPlatform, SearchPathSettings,
};
use ruff_db::files::{system_path_to_file, File, Files};
use ruff_db::system::{DbWithTestSystem, System, SystemPathBuf, TestSystem};
use ruff_db::system::{
DbWithTestSystem, DbWithWritableSystem as _, System, SystemPathBuf, TestSystem,
};
use ruff_db::vendored::VendoredFileSystem;
use ruff_db::{Db as SourceDb, Upcast};
use ruff_python_ast::PythonVersion;