code: def test_matadd_of_matrices():
      assert MatAdd(
          eye(2), 4 * eye(2), eye(2)
      ).doit() == ImmutableMatrix(6 * eye(2))
      assert add(eye(2), 4 * eye(2), eye(2)).doit() == ImmutableMatrix(
          6 * eye(2)
      )
  
file_path: sympy/sympy/matrices/expressions/tests/test_matadd.py
imports: from sympy.matrices.expressions import MatrixSymbol, MatAdd, MatPow, MatMul
  from sympy.matrices.expressions.special import GenericZeroMatrix, ZeroMatrix
  from sympy.matrices.exceptions import ShapeError
  from sympy.matrices import eye, ImmutableMatrix
  from sympy.core import Add, Basic, S
  from sympy.core.add import add
  from sympy.testing.pytest import XFAIL, raises
label_desc: Use image node_id 4 for calling a global function with example usage: test_matadd_of_matrices() without return types