Add support for multi-file tests

.github/workflows/format.yml

@@ -54,3 +54,14 @@ jobs:
           cargo +nightly clippy --manifest-path rule-preprocessor/Cargo.toml --all-targets --all-features -- -Dwarnings
           cargo clippy --manifest-path libcc2rs/Cargo.toml --all-targets --all-features -- -Dwarnings
           cargo clippy --manifest-path libcc2rs-macros/Cargo.toml --all-targets --all-features -- -Dwarnings
+
+      - name: Check Python (ruff)
+        uses: astral-sh/ruff-action@v3
+        with:
+          args: 'check'
+          src: tests/lit/lit/formats/Cpp2RustTest.py
+      - name: Check Python formatting (ruff)
+        uses: astral-sh/ruff-action@v3
+        with:
+          args: 'format --check'
+          src: tests/lit/lit/formats/Cpp2RustTest.py

CMakeLists.txt

@@ -121,6 +121,7 @@ add_custom_target("check-unit"
                           ${LIT_FLAGS}
                           "${PROJECT_SOURCE_DIR}/tests/unit"
                           "${PROJECT_SOURCE_DIR}/tests/ub"
+                          "${PROJECT_SOURCE_DIR}/tests/multi-file"
                   DEPENDS cpp2rust libcc2rs
                   USES_TERMINAL
                  )