I am trying to doctest the coding folder with the optional gap_packages. 
But it seems to skip the statements without the "# optional" statement. The 
result of it is that the optional tests are all failing. Here is an output:

...allations/sage-git [128] ยป sage -t --optional=gap_packages src/sage/
coding
Running doctests with ID 2014-07-13-19-47-19-ba9f5690.
Doctesting 17 files.
sage -t src/sage/coding/binary_code.pyx
    [0 tests, 0.01 s]
sage -t src/sage/coding/decoder.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/codes_catalog.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/code_constructions.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/sd_codes.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/all.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/delsarte_bounds.py
    [0 tests, 0.00 s]
sage -t src/sage/coding/linear_code.py
**********************************************************************
File "src/sage/coding/linear_code.py", line 371, in sage.coding.linear_code.
min_wt_vec_gap
Failed example:
    sage.coding.linear_code.min_wt_vec_gap(Gstr,7,4,GF(2),algorithm="guava") 
   # optional - gap_packages (Guava package)
Exception raised:
    Traceback (most recent call last):
      File 
"/home/punarbasu/Installations/sage-git/local/lib/python2.7/site-packages/sage/doctest/forker.py"
, line 480, in _run
        self.execute(example, compiled, test.globs)
      File 
"/home/punarbasu/Installations/sage-git/local/lib/python2.7/site-packages/sage/doctest/forker.py"
, line 839, in execute
        exec compiled in globs
      File "<doctest sage.coding.linear_code.min_wt_vec_gap[0]>", line 1, in 
<module>
        sage.coding.linear_code.min_wt_vec_gap(Gstr,Integer(7),Integer(4),GF
(Integer(2)),algorithm="guava")    # optional - gap_packages (Guava package)
    NameError: name 'Gstr' is not defined
**********************************************************************

This shouldn't fail because 'Gstr' is defined all right in the actual file:

    EXAMPLES::


        sage: Gstr = "Z(2)*[[1,1,1,0,0,0,0], [1,0,0,1,1,0,0], 
[0,1,0,1,0,1,0], [1,1,0,1,0,0,1]]"
        sage: sage.coding.linear_code.min_wt_vec_gap(Gstr,7,4,GF(2))
        (0, 1, 0, 1, 0, 1, 0)


    This output is different but still a minimum weight vector::


        sage: sage.coding.linear_code.min_wt_vec_gap(Gstr,7,4,GF(2),
algorithm="guava")    # optional - gap_packages (Guava package)
        (0, 0, 1, 0, 1, 1, 0)

Also, note that the files preceding "linear_code.py" all report "0 tests", 
which doesn't make any sense.

Is there some other argument I must provide with --optional?

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