def _testThresholdGlyph():
    """
    >>> from fontPens.printPen import PrintPen
    >>> glyph = _makeTestGlyph()
    >>> thresholdGlyph(glyph) #doctest: +ELLIPSIS
    <RGlyph...
    >>> glyph.draw(PrintPen())
    pen.moveTo((100, 100))
    pen.lineTo((900, 100))
    pen.lineTo((900, 800))
    pen.lineTo((100, 800))
    pen.closePath()
    pen.addComponent('a', (1.0, 0.0, 0.0, 1.0, 0.0, 0.0))
    """
