#16154: fix some doctests in Doc/library.  Patch by Ravi Sinha.
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index e5ffba0..57d7762 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -82,6 +82,8 @@
 
 
 .. function:: fsum(iterable)
+.. testsetup::
+        >>> from math import fsum
 
    Return an accurate floating point sum of values in the iterable.  Avoids
    loss of precision by tracking multiple intermediate partial sums::