test moment(0)

tfields/core.py

@@ -990,9 +990,6 @@ class Tensors(AbstractNdarray):
         """
         Returns:
             Moments of the distribution.
-        Note:
-            The first moment is given as the mean,
-            second as variance etc. Not 0 as it is mathematicaly correct.
         Args:
             moment (int): n-th moment
         Examples:
@@ -1001,7 +998,7 @@ class Tensors(AbstractNdarray):
 
             Skalars
             >>> t = tfields.Tensors(range(1, 6))
-            >>> t.moment(1)
+            >>> assert t.moment(1) == 0
             >>> assert t.moment(1, weights=[-2, -1, 20, 1, 2]) == 0.5
             >>> assert t.moment(2, weights=[0.25, 1, 17.5, 1, 0.25]) == 0.2