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# Test the doctesting framework

Many tests (with expected failures or crashes) are run in a subprocess, those tests can be found in the `tests/` subdirectory.

EXAMPLES:

    sage: import signal
    sage: import subprocess
    sage: import time
    sage: from sage.env import SAGE_SRC
    sage: tests_dir = os.path.join(SAGE_SRC, 'sage', 'doctest', 'tests')
    sage: tests_env = dict(os.environ)

Unset `TERM` when running doctests, see trac ticket #14370:

    sage: try:
    ....:     del tests_env['TERM']
    ....: except KeyError:
    ....:     pass
    sage: kwds = {'cwd': tests_dir, 'env':tests_env}

Check that trac ticket #2235 has been fixed:

    sage: subprocess.call(["sage", "-t", "--warn-long", "0", "longtime.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 longtime.rst
    [0 tests, ...s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0
    sage: subprocess.call(["sage", "-t", "--warn-long", "0", "-l", "longtime.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --long --warn-long 0.0 longtime.rst
    [1 test, ...s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0

Check handling of tolerances:

    sage: subprocess.call(["sage", "-t", "--warn-long", "0", "tolerance.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 tolerance.rst
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print ":-("    # abs tol 0.1
    Expected:
        :-)
    Got:
        :-(
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print "1.0 2.0 3.0"  # abs tol 0.1
    Expected:
        4.0 5.0
    Got:
        1.0 2.0 3.0
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print "Hello"  # abs tol 0.1
    Expected:
        1.0
    Got:
        Hello
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print "1.0"  # abs tol 0.1
    Expected:
        Hello
    Got:
        1.0
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print "Hello 1.1"  # abs tol 0.1
    Expected:
        Goodbye 1.0
    Got:
        Hello 1.1
    **********************************************************************
    File "tolerance.rst", line ..., in sage.doctest.tests.tolerance
    Failed example:
        print "Hello 1.0"  # rel tol 1e-6
    Expected:
        Goodbye 0.999999
    Got:
        Hello 1.0
    Tolerance exceeded:
        0.999999 vs 1.0, tolerance 1e-06 > 1e-06
    **********************************************************************
    ...
    1

Test the `--initial` option:

    sage: subprocess.call(["sage", "-t", "--warn-long", "0", "-i", "initial.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 initial.rst
    **********************************************************************
    File "initial.rst", line 4, in sage.doctest.tests.initial
    Failed example:
        a = binomiak(10,5)  # random to test that we still get the exception
    Exception raised:
        Traceback (most recent call last):
        ...
        NameError: name 'binomiak' is not defined
    **********************************************************************
    File "initial.rst", line 14, in sage.doctest.tests.initial
    Failed example:
        binomial(10,5)
    Expected:
        255
    Got:
        252
    **********************************************************************
    ...
    ----------------------------------------------------------------------
    sage -t  --warn-long 0.0 initial.rst  # 5 doctests failed
    ----------------------------------------------------------------------
    ...
    1

Test a timeout using the `SAGE_TIMEOUT` environment variable:

    sage: from copy import deepcopy
    sage: kwds2 = deepcopy(kwds)
    sage: kwds2['env']['SAGE_TIMEOUT'] = "3"
    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "99seconds.rst"], **kwds2)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 99seconds.rst
        Timed out
    **********************************************************************
    Tests run before process (pid=...) timed out:
    ...
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 99seconds.rst  # Timed out
    ----------------------------------------------------------------------
    ...
    4

Test handling of `KeyboardInterrupt` in doctests:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "keyboardinterrupt.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 keyboardinterrupt.rst
    **********************************************************************
    File "keyboardinterrupt.rst", line 11, in sage.doctest.tests.keyboardinterrupt
    Failed example:
        raise KeyboardInterrupt
    Exception raised:
        Traceback (most recent call last):
        ...
        KeyboardInterrupt
    **********************************************************************
    ...
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 keyboardinterrupt.rst  # 1 doctest failed
    ----------------------------------------------------------------------
    ...
    1

Interrupt the doctester:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "interrupt.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 interrupt.rst
    Killing test interrupt.rst
    ----------------------------------------------------------------------
    Doctests interrupted: 0/1 files tested
    ----------------------------------------------------------------------
    ...
    128

Interrupt the doctester (while parallel testing) when a doctest cannot be interrupted. We also test that passing a ridiculous number of threads doesn’t hurt:

    sage: F = tmp_filename()
    sage: from copy import deepcopy
    sage: kwds2 = deepcopy(kwds)
    sage: kwds2['env']['DOCTEST_TEST_PID_FILE'] = F  # Doctester will write its PID in this file
    sage: subprocess.call(["sage", "-tp", "1000000", "--timeout=120",  # long time
    ....:      "--warn-long", "0", "99seconds.rst", "interrupt_diehard.rst"], **kwds2)
    Running doctests...
    Doctesting 2 files using 1000000 threads.
    Killing test 99seconds.rst
    Killing test interrupt_diehard.rst
    ----------------------------------------------------------------------
    Doctests interrupted: 0/2 files tested
    ----------------------------------------------------------------------
    ...
    128

Even though the doctester master process has exited, the child process is still alive, but it should be killed automatically in max(20, 120 * 0.05) = 20 seconds:

    sage: pid = int(open(F).read())    # long time
    sage: time.sleep(2)                # long time
    sage: os.kill(pid, signal.SIGHUP)  # long time; 2 seconds passed => still alive
    sage: time.sleep(23)               # long time
    sage: os.kill(pid, signal.SIGHUP)  # long time; 25 seconds passed => dead
    Traceback (most recent call last):
    ...
    OSError: ...

Test a doctest failing with `abort()`:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "abort.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 abort.rst
        Killed due to abort
    **********************************************************************
    Tests run before process (pid=...) failed:
    ...
    ------------------------------------------------------------------------
    Unhandled SIGABRT: An abort() occurred in Sage.
    This probably occurred because a *compiled* component of Sage has a bug
    in it and is not properly wrapped with sig_on(), sig_off().
    Sage will now terminate.
    ------------------------------------------------------------------------
    ...
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 abort.rst  # Killed due to abort
    ----------------------------------------------------------------------
    ...
    16

A different kind of crash:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "fail_and_die.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 fail_and_die.rst
    **********************************************************************
    File "fail_and_die.rst", line 5, in sage.doctest.tests.fail_and_die
    Failed example:
        this_gives_a_NameError
    Exception raised:
        Traceback (most recent call last):
        ...
        NameError: name 'this_gives_a_NameError' is not defined
        Killed due to kill signal
    **********************************************************************
    Tests run before process (pid=...) failed:
    ...
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 fail_and_die.rst  # Killed due to kill signal
    ----------------------------------------------------------------------
    ...
    16

Test that `sig_on_count` is checked correctly:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "sig_on.rst"], **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 sig_on.rst
    **********************************************************************
    File "sig_on.rst", line 5, in sage.doctest.tests.sig_on
    Failed example:
        sig_on_count()
    Expected:
        0
    Got:
        1
    **********************************************************************
    1 item had failures:
       1 of   4 in sage.doctest.tests.sig_on
        [2 tests, 1 failure, ...]
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 sig_on.rst  # 1 doctest failed
    ----------------------------------------------------------------------
    ...
    1

Test the `--debug` option:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--debug", "simple_failure.rst"], stdin=open(os.devnull), **kwds)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 simple_failure.rst
    **********************************************************************
    File "simple_failure.rst", line 7, in sage.doctest.tests.simple_failure
    Failed example:
        a * b
    Expected:
        20
    Got:
        15
    **********************************************************************
    Previously executed commands:
        s...: a = 3
        s...: b = 5
        s...: a + b
        8
    debug:
    <BLANKLINE>
    Returning to doctests...
    **********************************************************************
    1 item had failures:
       1 of   5 in sage.doctest.tests.simple_failure
        [4 tests, 1 failure, ...]
    ----------------------------------------------------------------------
    sage -t --warn-long 0.0 simple_failure.rst  # 1 doctest failed
    ----------------------------------------------------------------------
    ...
    1

Test running under gdb, without and with a timeout:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--gdb", "1second.rst"], stdin=open(os.devnull), **kwds)  # long time, optional: gdb
    exec gdb ...
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 1second.rst
        [2 tests, ... s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0
    sage: subprocess.call(["sage", "-t", "--gdb",  "--warn-long", "0", "-T" "5", "99seconds.rst"], stdin=open(os.devnull), **kwds)  # long time, optional: gdb
    exec gdb ...
    Running doctests...
        Timed out
    4

Test the `--show-skipped` option:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--show-skipped", "show_skipped.rst"], **kwds)  # long time
    Running doctests ...
    Doctesting 1 file.
    sage -t --warn-long 0.0 show_skipped.rst
        1 unlabeled test not run
        2 tests not run due to known bugs
        1 gap test not run
        1 long test not run
        1 other test skipped
        [1 test, ... s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0

Optional tests are run correctly:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--long", "--show-skipped", "--optional=sage,gap", "show_skipped.rst"], **kwds)  # long time
    Running doctests ...
    Doctesting 1 file.
    sage -t --long --warn-long 0.0 show_skipped.rst
        1 unlabeled test not run
        2 tests not run due to known bugs
        1 other test skipped
        [3 tests, ... s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--long", "--show-skipped", "--optional=gAp", "show_skipped.rst"], **kwds)  # long time
    Running doctests ...
    Doctesting 1 file.
    sage -t --long --warn-long 0.0 show_skipped.rst
        1 unlabeled test not run
        2 tests not run due to known bugs
        1 sage test not run
        1 other test skipped
        [2 tests, ... s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0

Test an invalid value for `--optional`:

    sage: subprocess.call(["sage", "-t",  "--warn-long", "0", "--optional=bad-option", "show_skipped.rst"], **kwds)
    Traceback (most recent call last):
    ...
    ValueError: invalid optional tag 'bad-option'
    1

Test `atexit` support in the doctesting framework:

    sage: F = tmp_filename()
    sage: os.path.isfile(F)
    True
    sage: from copy import deepcopy
    sage: kwds2 = deepcopy(kwds)
    sage: kwds2['env']['DOCTEST_DELETE_FILE'] = F
    sage: subprocess.call(["sage", "-t", "--warn-long", "0", "atexit.rst"], **kwds2)  # long time
    Running doctests...
    Doctesting 1 file.
    sage -t --warn-long 0.0 atexit.rst
        [3 tests, ... s]
    ----------------------------------------------------------------------
    All tests passed!
    ----------------------------------------------------------------------
    ...
    0
    sage: os.path.isfile(F)  # long time
    False
    sage: try:
    ....:     os.unlink(F)
    ....: except OSError:
    ....:     pass

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