fix: revise test of gaussian process

test/test_model.py

@@ -28,6 +28,7 @@
 from sklearn.gaussian_process.kernels import DotProduct, WhiteKernel
 
 from eddymotion import model
+from eddymotion.model.dipy import GaussianProcessModel
 from eddymotion.data.dmri import DWI
 from eddymotion.data.splitting import lovo_split
 from eddymotion.exceptions import ModelNotFittedError
@@ -107,12 +108,8 @@ def test_average_model():
     assert np.all(tmodel_2000.predict([0, 0, 0]) == 1100)
 
 
-def test_gp_model(datadir):
-    dwi = DWI.from_filename(datadir / "dwi.h5")
-
-    kernel = DotProduct() + WhiteKernel()
-
-    gp = model.GaussianProcessModel(dwi=dwi, kernel=kernel)
+def test_gp_model():
+    gp = GaussianProcessModel(kernel="default")
 
     assert isinstance(gp, model.GaussianProcessModel)