code: def test_sqrt():
      a = sqrt(interval(1, 4))
      assert a.start == 1
      assert a.end == 2
  
      a = sqrt(interval(0.01, 1))
      assert a.start == np.sqrt(0.01)
      assert a.end == 1
  
      a = sqrt(interval(-1, 1))
      assert a.is_valid is None
  
      a = sqrt(interval(-3, -1))
      assert a.is_valid is False
  
      a = sqrt(4)
      assert (a == interval(2, 2)) == (True, True)
  
      a = sqrt(-3)
      assert a.is_valid is False
  
imports: from sympy.external import import_module
  from sympy.plotting.intervalmath import Abs, acos, acosh, And, asin, asinh, atan, atanh, ceil, cos, cosh, exp, floor, imax, imin, interval, log, log10, Or, sin, sinh, sqrt, tan, tanh
label_desc: Use image node_id 9 for calling a global function with example usage: test_sqrt() without return types