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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
crates/red_knot_test/src/assertion.rs
View file

@ -490,12 +490,12 @@ pub(crate) enum ErrorAssertionParseError<'a> {
mod tests {
use super::*;
use ruff_db::files::system_path_to_file;
use ruff_db::system::{DbWithTestSystem, SystemPathBuf};
use ruff_db::system::DbWithWritableSystem as _;
use ruff_python_trivia::textwrap::dedent;
use ruff_source_file::OneIndexed;
fn get_assertions(source: &str) -> InlineFileAssertions {
let mut db = crate::db::Db::setup(SystemPathBuf::from("/src"));
let mut db = Db::setup();
db.write_file("/src/test.py", source).unwrap();
let file = system_path_to_file(&db, "/src/test.py").unwrap();
InlineFileAssertions::from_file(&db, file)