# Command: unittest::crash_or_die

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Name:

    unittest::crash_or_die - Execute a code block and exit with exit code 3 if nest does not crash

Synopsis:

    { code } [string] crash_or_die ->	-

Examples:

      {add_dd} (add_dd)  crash_or_die  -> success
      {add}	 crash_or_die  -> quit

Description:

      The procedure tests that the code block crashes nest. An example
      is a call of operator add_dd in a situation where the operand stack is empty.
      add_dd does not check whether the operand stack contains enough data, no exception
      is raised. Therefore, the assertion in the C++ implementation of add_dd that the
      operand stack contains at least 2 elements fails and nest terminates with the exit
      code statusdict::exitcodes::abort. This is the desired behavior and therefore
      crash_or_die reports success. There are several alternative and undesired behaviors
      of the code block in question. add_dd may raise a StackUnderflow error, return without
      raising an error, or crash because of a segmentation fault. This is not the expected behavior
      and therefore crash_or_die reports a problem. Like failbutnocrash_or_die, crash_or_die
      survives a crash of the code block by probing the code block in a separate nest instance
      and inspecting the result. The procedure uses the symbolic exit codes defined in
      statusdict::exitcodes, abort is one of them.
      This test does not work if nest is compiled with the NDEBUG flag set and it is not
      safe to just test for a crash because nest may become inconsistent without crashing.
      Therefore, crah_or_die always reports success if the NDEBUG flag is set.

Diagnostics:

      This function will quit nest (exit code 3) if the code does NOT crash nest
      with exit code abort. It will print an error message to cerr, too.

Availability:

    SLI-2.0

Author:

    Diesmann

FirstVersion:

    090209

SeeAlso:

- unittest::failbutnocrash_or_die
- assert
- quit

Source:

    /opt/conda/conda-bld/nest_1512418773968/work/nest-2.14.0/lib/sli/unittest.sli

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