def run_test_line_minus():
    ' Tests the   line_minus   method of the Line class. '
    m1t.run_test_line_minus()
    line1 = Line(Point(500, 20), Point(100, 8))
    line2 = Line(Point(100, 13), Point(400, 8))
    line3 = line1.line_minus(line2)
    print(line3)
    print('The above should print:  Line[(400, 7), (-300, 0)]')
Tests the   line_minus   method of the Line class.
def run_test_line_minus():
    '  '
    m1t.run_test_line_minus()
    line1 = Line(Point(500, 20), Point(100, 8))
    line2 = Line(Point(100, 13), Point(400, 8))
    line3 = line1.line_minus(line2)
    print(line3)
    print('The above should print:  Line[(400, 7), (-300, 0)]')