code: def test_MatMul():
      expr = X * Y * Z
      expr_t = aesara_code_(expr)
      assert isinstance(expr_t.owner.op, Dot)
      assert theq(expr_t, Xt.dot(Yt).dot(Zt))
  
imports: import logging
  from sympy.external import import_module
  from sympy.testing.pytest import raises, SKIP
  from sympy.utilities.exceptions import ignore_warnings
  import sympy
  from sympy.core.singleton import S
  from sympy.abc import x, y, z, t
  from sympy.printing.aesaracode import aesara_code, dim_handling, aesara_function
label_desc: Use image node_id 17 for calling a global function with example usage: test_MatMul() without return types