code: def test_satask():
      # No relevant facts
      assert satask(Q.real(x), Q.real(x)) is True
      assert satask(Q.real(x), ~Q.real(x)) is False
      assert satask(Q.real(x)) is None
  
      assert satask(Q.real(x), Q.positive(x)) is True
      assert satask(Q.positive(x), Q.real(x)) is None
      assert satask(Q.real(x), ~Q.positive(x)) is None
      assert satask(Q.positive(x), ~Q.real(x)) is False
  
      raises(
          ValueError, lambda: satask(Q.real(x), Q.real(x) & ~Q.real(x))
      )
  
      with assuming(Q.positive(x)):
          assert satask(Q.real(x)) is True
          assert satask(~Q.positive(x)) is False
          raises(ValueError, lambda: satask(Q.real(x), ~Q.positive(x)))
  
      assert satask(Q.zero(x), Q.nonzero(x)) is False
      assert satask(Q.positive(x), Q.zero(x)) is False
      assert satask(Q.real(x), Q.zero(x)) is True
      assert satask(Q.zero(x), Q.zero(x * y)) is None
      assert satask(Q.zero(x * y), Q.zero(x))
  
imports: from sympy.assumptions.ask import Q
  from sympy.assumptions.assume import assuming
  from sympy.core.numbers import I, pi
  from sympy.core.relational import Eq, Gt
  from sympy.core.singleton import S
  from sympy.core.symbol import symbols
  from sympy.functions.elementary.complexes import Abs
  from sympy.logic.boolalg import Implies
  from sympy.matrices.expressions.matexpr import MatrixSymbol
  from sympy.assumptions.cnf import CNF, Literal
  from sympy.assumptions.satask import satask, extract_predargs, get_relevant_clsfacts
  from sympy.testing.pytest import raises, XFAIL
label_desc: Use image node_id 1 for calling a global function with example usage: test_satask() without return types