docstr: since numeric split points are provided, fit will not do anything
code: def test_fit_transform_raises_error(self):
      """since numeric split points are provided, fit will not do anything"""
  
      d = Discretiser(method="fixed", numeric_split_points=[1])
      with pytest.raises(RuntimeError):
          d.fit_transform(np.array([1]))
  
imports: import math
  import numpy
  import pytest
  from causalnex.discretiser import Discretiser
label_desc: Use image node_id 2 for calling the TestFixed obj's underlying member method code with example usage: obj.test_fit_transform_raises_error() without return types