code: def metric_matrix_test_data(self):
      data = [
          dict(
              base_point=gs.array([1.0, 1.0]),
              expected=gs.array(
                  [[1.0, -0.644934066], [-0.644934066, 1.0]]
              ),
          )
      ]
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .dirichlet import DirichletDistributionsTestData, DirichletMetricTestData
label_desc: Use image node_id 1 for calling the BetaMetricSmokeTestData obj's underlying member method code with example usage: obj.metric_matrix_test_data() and returns: self