def get_kernel_spec(self, kernel_name):
        """Returns a :class:`KernelSpec` instance for the given kernel_name.

        Raises :exc:`NoSuchKernel` if the given kernel name is not found.
        """
        if kernel_name == CURRENT_ENV_KERNEL_NAME:
            return self.kernel_spec_class(
                resource_dir=ipykernel.kernelspec.RESOURCES,
                **ipykernel.kernelspec.get_kernel_dict())
        else:
            return super(NbvalKernelspecManager, self).get_kernel_spec(kernel_name)