code: def test_imax():
      a = imax(interval(-2, 2), interval(2, 7), interval(-3, 9))
      assert a.start == 2
      assert a.end == 9
  
      a = imax(8, interval(1, 4))
      assert a.start == 8
      assert a.end == 8
  
      a = imax(
          interval(1, 2),
          interval(3, 4),
          interval(-2, 2, is_valid=False),
      )
      assert a.start == 3
      assert a.end == 4
  
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 11 for calling a global function with example usage: test_imax() without return types