def METHOD_NAME(self):
    # Test with group_var in metas (object array)
    gvar = self.collagen.domain.class_var
    c_domain = self.collagen.domain
    str_var = Orange.data.StringVariable.make(name="stringtest")
    n_domain = Orange.data.Domain(c_domain.attributes,
                                  None,
                                  [c_domain.class_var, str_var])
    collagen = self.collagen.transform(n_domain)
    # collagen.metas[:, 1] = np.atleast_2d(self.collagen.Y)
    self.send_signal("Data", collagen)
    self.widget.group_var = gvar
    self.widget.grouping_changed()
    out = self.get_output("Averages")
    # First 195 rows are labelled "collagen"
    collagen_avg = np.mean(self.collagen.X[:195], axis=0)
    np.testing.assert_equal(out.X[1,], collagen_avg)