[Octave-bug-tracker] [bug #55577] test in file-io.cc-tst fails on Octave 5.0.90 (only in GUI with run_test_suite)

[Mike Miller]

Follow-up Comment #2, bug #55577 (project octave):

I also think this particular test might be outdated.

These input validation tests


%!error textscan (single (40))
%!error textscan ({40})


have been in Octave since 3.6.4 (with the value 4 instead of 40). They used to
both return an error about the _type_ of the argument. But starting with
Octave 4.2, the input validation changed and the error message changed. This
is also when textscan was rewritten as a compiled function.

Octave 4.0:


>> textscan (single (40))
error: textscan: first argument must be a file id or character string
error: called from
    textscan at line 108 column 5


Octave 4.2 and later:


>> textscan (single (40))
error: textscan: invalid stream number = 40


Maybe you have enough open files in your Octave session that 40 is a valid
file descriptor, and the test is not producing an error. Maybe having open
tabs in the file editor counts against the file descriptor count, so this
number may be higher?

So really I think this test should be deleted, if textscan now accepts a
single argument as a valid file descriptor.

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