code: def test_is_square_true(self, n_points):
      mat = self.data_generator.random_square_mat(n_points)
      self.test_is_square(mat, True)
  
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.matrices import Matrices
  from geomstats.test.test_case import TestCase
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.base import MatrixVectorSpaceTestCase
  from geomstats.test_cases.geometry.euclidean import EuclideanMetricTestCase
label_desc: Use image node_id 21 for calling the MatrixOperationsTestCase obj's underlying member method code with example usage: obj.test_is_square_true(n_points) without return types