code: def inner_coproduct_test_data(self):
      data = [
          dict(
              cotangent_vec_a=gs.array([1.0, 2.0]),
              cotangent_vec_b=gs.array([1.0, 2.0]),
              base_point=None,
              expected=gs.array(5.0),
          ),
      ]
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .base import VectorSpaceTestData
  from .mixins import GroupExpMixinsTestData
  from .riemannian_metric import RiemannianMetricTestData
label_desc: Use image node_id 4 for calling the EuclideanMetric2TestData obj's underlying member method code with example usage: obj.inner_coproduct_test_data() and returns: self