Add test for sympy/sympy#9549

sympy/series/tests/test_series.py

@@ -151,3 +151,10 @@ def test_issue_9173():
         (b_0*p_2 - b_1*p_3)/b_0**2)/y + (b_0**2*p_1 - b_0*b_1*p_2 -
             p_3*(b_0*b_2 - b_1**2))/b_0**3)/y)
     assert Q.series(y, n=3) == b_2*y**2 + b_1*y + b_0 + O(y**3)
+
+
+def test_issue_9549():
+    e = (x**2 + x + 1)/(x**3 + x**2)
+    r = e.series(x, oo)
+    assert r == x**(-5) - 1/x**4 + x**(-3) + 1/x + O(x**(-6), (x, oo))
+    assert e.series(x, oo, n=8) + O(1/x**6, (x, oo)) == r