PASS I(x^3, y^5) = 15 got 15
PASS I(y - x^2, y) = 2 got 2
PASS I(y^2 - x^3, y) = 3 got 3
PASS I(y^2 - x^3, x) = 2 got 2
PASS I(cusp, cusp + x^4) = 8 got 8
PASS I(node, y) = 2 got 2
PASS I(node, y - x) = 3 (tangent line) got 3
PASS I(node, cusp) = 4 got 4
PASS I(x^2 - y^3, y^2 - x^3) = 4 got 4
PASS I(x*y, x + y) = 2 got 2
PASS I((x^2+y^2)^2 + 3x^2y - y^3, (x^2+y^2)^3 - 4x^2y^2) = 14 (Fulton ex.) got 14
PASS I(y, y + x^2 y) = INF got inf
self test: True
