pub fn trust(ca_pem: &str)Expand description
Trusts ca_pem in every client this crate builds for the rest of
this process.
super::EXTRA_CA_CERTS is how a running program is told, and a
test cannot use it: a client built inside this workspace — a pinned
one, or any caller’s — is not a client a test can hand roots to, and
an environment variable is shared by every test in the binary.
Additive, like the variable, and only for a test: a server a test stood up signs from an authority it made, and this is how the code under test reaches it.