Test coverage for cando.virginia

cando/      covered 65% (1022 of 2940 uncovered)
    virginia/      covered 94% (33 of 552 uncovered)
        competency.py      covered 89% (26 of 257 uncovered)
        browser/      covered 50% (6 of 12 uncovered)
        student.py      covered 98% (1 of 81 uncovered)
        __init__.py      covered 100% (0 of 1 uncovered)
        interfaces.py      covered 100% (0 of 103 uncovered)
        scoresystem.py      covered 100% (0 of 98 uncovered)