It has been available in Octave for a long time.

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.

isequalwithequalnans does not exist in Octave 4.2 and both Octave and Matlab encourage use of isequaln

Print PASSED or FAILED for each tested routine.

If m-unit-tests/src is in the Matlab/Octave's path, then

help m-unit-tests/src

will display the list of routines in the toolbox and an example.

To use this toolbox the src folder should be added to the Matlab's path
and the script src/initialize_unit_tests_toolbox should be executed (if
needed the missing subfolder will be added to the path).

Wrong arguments passed to reshape() routine.

Output argument t was not initialized when dassert() routine was called
with three arguments for comparing arrays of doubles.

First input of isa() routine is the tested object, not the type of the object...

Propagate the correct number of input arguments in recursive calls.

Missing condition to decide which version of isequal should be used.