code: def test_ImplicitRegion():
      ellipse = ImplicitRegion((x, y), (x**2 / 4 + y**2 / 16 - 1))
      assert ellipse.equation == x**2 / 4 + y**2 / 16 - 1
      assert ellipse.variables == (x, y)
      assert ellipse.degree == 2
      r = ImplicitRegion((x, y, z), Eq(x**4 + y**2 - x * y, 6))
      assert r.equation == x**4 + y**2 - x * y - 6
      assert r.variables == (x, y, z)
      assert r.degree == 4
  
file_path: sympy/sympy/vector/tests/test_implicitregion.py
imports: from sympy.core.relational import Eq
  from sympy.core.singleton import S
  from sympy.abc import x, y, z, s, t
  from sympy.sets import FiniteSet, EmptySet
  from sympy.geometry import Point
  from sympy.vector import ImplicitRegion
  from sympy.testing.pytest import raises
label_desc: Use image node_id 1 for calling a global function with example usage: test_ImplicitRegion() without return types