tests: add codeset-utf8 as a feature

To avoid having to use <precheck> for tests that require UTF-8 support.

Closes #15039

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

show more ...

pop3/smtp: return *WEIRD_SERVER_REPLY when not understood

This leaves the CURLE_RECV_ERROR error code for explicit failure to
receive network data and allows users to better separate the

pop3/smtp: return *WEIRD_SERVER_REPLY when not understood

This leaves the CURLE_RECV_ERROR error code for explicit failure to
receive network data and allows users to better separate the problems.

Ref #8356
Reported-by: Rianov Viacheslav
Closes #8506

show more ...

tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

tests: disable SMTP UTF-8 tests on Windows

Fixes #4988
Closes #4992

smtp: Added UTF-8 mailbox tests to verify existing behaviour