code: def test_hbar():
      assert hbar.is_commutative is True
      assert hbar.is_real is True
      assert hbar.is_positive is True
      assert hbar.is_negative is False
      assert hbar.is_irrational is True
  
      assert hbar.evalf() == Float(1.05457162e-34)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_hbar() without return types