def METHOD_NAME(self):
    p1 = (1, 0, 0)
    p2 = (0, 1, 0)
    p3 = (0, 0, 1)
    plane = PlaneEquation.from_three_points(p1, p2, p3)
    self.assertEquals(plane.a, 1)
    self.assertEquals(plane.b, 1)
    self.assertEquals(plane.c, 1)
    self.assertEquals(plane.d, -1)