The unit tests are no more triggered by a comment on the first line (which is
kind of problematic for the help comand in Octave) but by a comment after the
last return statement.

Also English correction (unitary test -> unit test).

It is now supported by the MATLAB editor (as of R2022a).

Otherwise the final report cannot be displayed.

Was not working if the second line of the test was empty and had no trailing space.

In this case the unit tests blocks must be preceeded by a return
statement.