class_docstr: Mixin class for copy testing 
class_docstr_tok: ["Mixin","class","for","copy","testing"]
code: def test_x_and_y_stride(self):
      x = arange(12.0, dtype=self.dtype)
      y = zeros(6, x.dtype)
      y = self.blas_func(x, y, n=3, incx=4, incy=2)
      assert_array_equal(x[::4], y[::2])
  
imports: from numpy import float32, float64, complex64, complex128, arange, array, zeros, shape, transpose, newaxis, common_type, conjugate
  from scipy.linalg import _fblas
  from numpy.testing import assert_array_equal, assert_allclose, assert_array_almost_equal, assert_
  import pytest
label_desc: Use image node_id 4 for calling the BaseCopy obj's underlying member method code with example usage: obj.test_x_and_y_stride() without return types