Returns absolute, normalized paths to known wrapper test scripts under
tests/ for a data.table source checkout. This is used to determine
which wrapper files exist locally so that callers can distinguish between
the canonical entrypoint tests/main.R and other wrapper scripts
(e.g., froll.R, programming.R, etc.).
dt_find_wrapper_tests(pkg_source_path)character(). A vector of existing files among the known candidates,
with absolute paths normalized via normalizePath(..., winslash = "/").
The vector is empty if none of the candidates exist.
character(1). Path to the package source root that
contains the tests/ directory.
The candidate list is intentionally small and stable. If the upstream repository adds additional wrappers, extend this function’s list.