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Writing tests for function is an important thing that is usually overlooked. It helps a lot in preventing regression. There's a section in the [manual] for it.
in .m files
in .cc files
declaring functions inside a test block
function experience %!test %! experience_design_mat %! experience_obs_eqs %! assert (experience_design_mat == pi); %! assert (experience_obs_eqs == exp(1)); %! %! endfunction % this is a trick. %! % now we can declare functions to be used by the test above. %! %! function a = experience_design_mat %! a = pi; %! endfunction %! %! function b = experience_obs_eqs %! b = exp(1); %! % endfunction: don't add it here. Let test() do it.
from m files
from .cc files
You can run tests in .cc files by doing something like