def test_leitura_campo_alfa(self):
        self.assertEqual(self.header_arquivo.cedente_nome,
                         'TRACY TECNOLOGIA LTDA ME')
def __init__(self, data, amount_clusters, means=None, variances=None, observer=None, tolerance=0.00001, iterations=100):
        """!
        @brief Initializes Expectation-Maximization algorithm for cluster analysis.