integrals: correct Integral._eval_nseries()

diofant · Apr 23, 2022 · f619b4e · f619b4e
1 parent 7f90777
commit f619b4e
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diff --git a/diofant/integrals/integrals.py b/diofant/integrals/integrals.py
@@ -928,6 +928,7 @@ def _eval_nseries(self, x, n, logx):
                 break
         terms, order = expr.function.nseries(
             x=symb, n=n, logx=logx).as_coeff_add(Order)
+        order = [o.subs({symb: x}) for o in order]
         return integrate(terms, *expr.limits) + Add(*order)*x
 
     def as_sum(self, n, method='midpoint'):

diff --git a/diofant/tests/integrals/test_integrals.py b/diofant/tests/integrals/test_integrals.py
@@ -862,7 +862,7 @@ def test_is_real():
 def test_series():
     i = Integral(cos(x), (x, x))
     e = i.series(x, n=None)
-    s1 = i.nseries(x, n=8).removeO().doit()
+    s1 = i.series(x, n=8).removeO().doit()
     s2 = Add(*[next(e) for j in range(4)])
     assert s1 == s2