fix a calculus doctest (giac, laplace, integration)

[fchapoton]

that currently prevents many patchbots to run smoothly

CC: @rwst @frederichan-IMJPRG

Component: calculus

Author: Frédéric Chapoton, Marcelo Forets

Branch/Commit: e2d74c6

Reviewer: Travis Scrimshaw, Steven Trogdon

Issue created by migration from https://trac.sagemath.org/ticket/22833

[fchapoton]

Branch: u/chapoton/22833

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

2186aca

fixing calculus doctest (giac)

[sagetrac-git]

Commit: 2186aca

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:3

I thought someone had already fixed this, but I guess not.

[mforets]

comment:4

the error was because of the double :: in TETS or the Unable to parse Giac output? or both? and how did you know that integration is ok? (i still get the NotImplementedError in sage8.0beta2) because the "dummy integrate" keyword of maxima is integrate.

[fchapoton]

comment:5

The change to TESTS:: was just something I could not keep like that once I had seen it.

I am not sure that the change to integration doctest is ok. If it fails on your machine, then you can set this ticket back to needs work.

[mforets]

comment:6

failing in my machine with:

Doctesting 1 file.
sage -t src/sage/calculus/calculus.py
**********************************************************************
File "src/sage/calculus/calculus.py", line 1365, in sage.calculus.calculus.laplace
Failed example:
    (p1+p2).save(os.path.join(SAGE_TMP, "de_plot.png"))
Expected nothing
Got:
    doctest:warning
      File "/Users/forets/sage-src/sage/src/bin/sage-runtests", line 89, in <module>
        err = DC.run()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/control.py", line 1134, in run
        self.run_doctests()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/control.py", line 858, in run_doctests
        self.dispatcher.dispatch()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 1705, in dispatch
        self.parallel_dispatch()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 1595, in parallel_dispatch
        w.start()  # This might take some time
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 1871, in start
        super(DocTestWorker, self).start()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/multiprocessing/process.py", line 130, in start
        self._popen = Popen(self)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/multiprocessing/forking.py", line 126, in __init__
        code = process_obj._bootstrap()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
        self.run()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 1844, in run
        task(self.options, self.outtmpfile, msgpipe, self.result_queue)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 2137, in __call__
        runner.run(test)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 641, in run
        return self._run(test, compileflags, out)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 503, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 866, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.calculus.calculus.laplace[23]>", line 1, in <module>
        (p1+p2).save(os.path.join(SAGE_TMP, "de_plot.png"))
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 471, in wrapper
        return func(*args, **kwds)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/plot/graphics.py", line 3170, in save
        figure = self.matplotlib(**options)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/plot/graphics.py", line 2566, in matplotlib
        from matplotlib.figure import Figure
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/figure.py", line 38, in <module>
        import matplotlib.colorbar as cbar
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/colorbar.py", line 34, in <module>
        import matplotlib.collections as collections
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/collections.py", line 27, in <module>
        import matplotlib.backend_bases as backend_bases
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 62, in <module>
        import matplotlib.textpath as textpath
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/textpath.py", line 15, in <module>
        import matplotlib.font_manager as font_manager
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/font_manager.py", line 1413, in <module>
        fontManager = pickle_load(_fmcache)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/font_manager.py", line 965, in pickle_load
        data = pickle.load(fh)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/font_manager.py", line 1044, in __init__
        self.ttffiles = findSystemFonts(paths) + findSystemFonts()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/font_manager.py", line 324, in findSystemFonts
        for f in get_fontconfig_fonts(fontext):
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/matplotlib/font_manager.py", line 273, in get_fontconfig_fonts
        warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
    :
    UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
**********************************************************************
File "src/sage/calculus/calculus.py", line 1407, in sage.calculus.calculus.laplace
Failed example:
    laplace(t^n, t, s, algorithm='giac')
Exception raised:
    Traceback (most recent call last):
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 503, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py", line 866, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.calculus.calculus.laplace[34]>", line 1, in <module>
        laplace(t**n, t, s, algorithm='giac')
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/calculus/calculus.py", line 1456, in laplace
        return result.sage()
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/interfaces/interface.py", line 1053, in sage
        return self._sage_(*args, **kwds)
      File "/Users/forets/sage-src/sage/local/lib/python2.7/site-packages/sage/interfaces/giac.py", line 1095, in _sage_
        raise NotImplementedError("Unable to parse Giac output: %s" % result)
    NotImplementedError: Unable to parse Giac output: integrate(t^n*exp(-s*t),t,0,+infinity)
**********************************************************************
1 item had failures:
   2 of  39 in sage.calculus.calculus.laplace
    [419 tests, 2 failures, 11.53 s]
----------------------------------------------------------------------
sage -t src/sage/calculus/calculus.py  # 2 doctests failed
----------------------------------------------------------------------
Total time for all tests: 11.6 seconds
    cpu time: 10.8 seconds
    cumulative wall time: 11.5 seconds