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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"`
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.