While the current tests are comprehensive, the following could add even more robustness:

Empty String:

Test splitting an empty string: split("", ' ').
Expected result (strip = false): {""}.
Expected result (strip = true): {}.
Single Character Input:

split("a", ' ') should return {"a"}.
split("-", '-') should return {"", ""} for strip = false and {} for strip = true.
Buffer Size:

Verify behavior with long tokens exceeding BUFFER_SIZE to ensure correct truncation.
Example: split(std::string(70, 'a') + ",b", ',', false).
Non-Printable Delimiters:

Test with special characters like \t (tab) or \n (newline).