code: def test_dgmm_x_scalar(self, dtype):
      if self.orderc != "F":
          pytest.skip()
      self._setup(dtype, xdim=0)
      ref = self.x * self.a
      c = cublas.dgmm(self.side, self.a, self.x, incx=0)
      cupy.testing.assert_allclose(c, ref, rtol=self.tol, atol=self.tol)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import cublas
  from cupy import testing
label_desc: Use image node_id 7 for calling the TestDgmm obj's underlying member method code with example usage: obj.test_dgmm_x_scalar(dtype) without return types