Prepare the certificates RootCA -> IntermediateCA -> Server (or take an existing chain like that).
Write a browsertest which requests a page from a server which has the Server certificate but does not send IntermediateCA.
The test should prepare ONC user policy which pushes RootCA as a trusted anchor (TrustBits: Web) and IntermediateCA as an untrusted CA (TrustBits: empty).
The expectation is that if IntermediateCA is pushed by policy, the cert verification will regard Server as valid (and if not, it will not be regarded as valid)
Comment 1 by pmarko@chromium.org
, Nov 14