$ workaround

Author: lczyk

tests/conftest.py

@@ -20,7 +20,12 @@ def ruby(request: pytest.FixtureRequest) -> Optional[str]:
     """Fixture to get the ruby executable from the command line options"""
     ruby = request.config.getoption("--ruby", None)
     assert isinstance(ruby, (str, type(None))), f"Invalid ruby option: {ruby}"
-    return ruby
+    if isinstance(ruby, str):
+        # we need to prepend the path with some garbage to make it not a valid
+        # path. otherwise pytest gets confused.
+        # https://github.com/pytest-dev/pytest/issues/13368
+        ruby = ruby.lstrip("$")
+    return ruby  # type: ignore
 
 
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