correct from_averaged_rototrans test

tests/test_processing_rt.py

@@ -241,13 +241,19 @@ def test_rt_transpose():
 
 
 def test_average_rt():
-    angles = Angles(np.random.rand(3, 1, 100))
     seq = "xyz"
+    angles_size = (3, 1, 100)
+    ref_angles_from_rt_mean = [0.25265133, 0.57436872, 0.79133042]
+
+    restard_seed()
+    angles = Angles.from_random_data(size=angles_size)
+    # min-max normalization to keep the angles low
+    angles = angles.pipe(lambda x: (x - x.min()) / (x.max() - x.min()))
 
     rt = Rototrans.from_euler_angles(angles, seq)
     rt_mean = Rototrans.from_averaged_rototrans(rt)
-    angles_mean = Angles.from_rototrans(rt_mean, seq).isel(time=0)
-
-    angles_mean_ref = Angles.from_rototrans(rt, seq).mean(dim="time")
+    angles_from_rt_mean = Angles.from_rototrans(rt_mean, seq)
 
-    np.testing.assert_array_almost_equal(angles_mean, angles_mean_ref, decimal=2)
+    np.testing.assert_almost_equal(
+        angles_from_rt_mean.data.ravel(), ref_angles_from_rt_mean, decimal=4
+    )