code: def test_fit_zero_variance(self, implementation):
      # Example from issue #2 on GitHub.
      X = np.asarray(
          [
              [
                  7.15000000e02,
                  5.85000000e02,
                  0.00000000e00,
                  0.00000000e00,
              ],
              [
                  7.15000000e02,
                  5.20000000e02,
                  1.04705811e00,
                  -6.03696289e01,
              ],
              [
                  7.15000000e02,
                  4.55000000e02,
                  7.20886230e-01,
                  -5.27055664e01,
              ],
              [
                  7.15000000e02,
                  3.90000000e02,
                  -4.57946777e-01,
                  -7.80605469e01,
              ],
              [
                  7.15000000e02,
                  3.25000000e02,
                  -6.43127441e00,
                  -5.59954834e01,
              ],
              [
                  7.15000000e02,
                  2.60000000e02,
                  -2.90063477e00,
                  -7.80220947e01,
              ],
              [
                  7.15000000e02,
                  1.95000000e02,
                  8.45532227e00,
                  -7.03294373e01,
              ],
              [
                  7.15000000e02,
                  1.30000000e02,
                  4.09387207e00,
                  -5.83621216e01,
              ],
              [
                  7.15000000e02,
                  6.50000000e01,
                  -1.21667480e00,
                  -4.48131409e01,
              ],
          ]
      )
      h = hmm.GaussianHMM(
          3, self.covariance_type, implementation=implementation
      )
      h.fit(X)
  
imports: import numpy
  from numpy.testing import assert_allclose
  import pytest
  from sklearn.utils import check_random_state
  from ..None import hmm
  from .None import assert_log_likelihood_increasing, make_covar_matrix, normalized
label_desc: Use image node_id 11 for calling the GaussianHMMTestMixin obj's underlying member method code with example usage: obj.test_fit_zero_variance(implementation) without return types