Rust: parametrize some integration tests on three editions

Author: Paolo Tranquilli

rust/ql/integration-tests/conftest.py

@@ -2,29 +2,55 @@
 import json
 import commands
 import pathlib
+import tomllib
+
+
+@pytest.fixture(params=[2018, 2021, 2024])
+def rust_edition(request):
+    return request.param
 
 
 @pytest.fixture
-def cargo(cwd):
-    assert (cwd / "Cargo.toml").exists()
+def cargo(cwd, rust_edition):
+    manifest_file = cwd / "Cargo.toml"
+    assert manifest_file.exists()
     (cwd / "rust-project.json").unlink(missing_ok=True)
 
+    def update(file):
+        contents = file.read_text()
+        m = tomllib.loads(contents)
+        if 'package' in m:
+            # tomllib does not support writing, and we don't want to use further dependencies
+            # so we just do a dumb search and replace
+            contents = contents.replace(f'edition = "{m["package"]["edition"]}"', f'edition = "{rust_edition}"')
+            file.write_text(contents)
+        if 'members' in m.get('workspace', ()):
+            for member in m['workspace']['members']:
+                update(file.parent / member / "Cargo.toml")
+
+    update(manifest_file)
+
+
 @pytest.fixture(scope="session")
 def rust_sysroot_src() -> str:
     rust_sysroot = pathlib.Path(commands.run("rustc --print sysroot", _capture=True))
     ret = rust_sysroot.joinpath("lib", "rustlib", "src", "rust", "library")
     assert ret.exists()
     return str(ret)
 
+
 @pytest.fixture
-def rust_project(cwd, rust_sysroot_src):
+def rust_project(cwd, rust_sysroot_src, rust_edition):
     project_file = cwd / "rust-project.json"
     assert project_file.exists()
     project = json.loads(project_file.read_text())
     project["sysroot_src"] = rust_sysroot_src
+    for c in project["crates"]:
+        c["edition"] = str(rust_edition)
     project_file.write_text(json.dumps(project, indent=4))
     (cwd / "Cargo.toml").unlink(missing_ok=True)
 
+
 @pytest.fixture
 def rust_check_diagnostics(check_diagnostics):
     check_diagnostics.redact += [

rust/ql/integration-tests/hello-project/Cargo.toml

@@ -2,6 +2,6 @@
 [package]
 name = "hello-cargo"
 version = "0.1.0"
-edition = "2021"
+edition = "2021"  # replaced in test
 
 [dependencies]

rust/ql/integration-tests/hello-[workspace]/Cargo.toml renamed to rust/ql/integration-tests/hello-workspace/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "exe"
 version = "0.1.0"
-edition = "2021"
+edition = "2021"  # replaced in test
 
 [dependencies]
 lib = { path = "../lib" }