"The LRS MUST reject requests without a version header unless such requests are routed to a fully conformant 0.9 implementation." (bold added).
The test An LRS rejects with error code 400 Bad Request, a Request which does not use a "X-Experience-API-Version" header name to any API except the About API should be either removed or modified to test that the request is either rejected, or receives a response following xAPI 0.9.
See https://github.com/adlnet/xAPI-Spec/blob/master/xAPI-Communication.md#lrs-requirements-5
"The LRS MUST reject requests without a version header unless such requests are routed to a fully conformant 0.9 implementation." (bold added).
The test
An LRS rejects with error code 400 Bad Request, a Request which does not use a "X-Experience-API-Version" header name to any API except the About API
should be either removed or modified to test that the request is either rejected, or receives a response following xAPI 0.9.