Forgot the import

Author: grhkm21

src/sage/rings/number_field/number_field_element_quadratic.pyx

@@ -2387,6 +2387,8 @@ cdef class NumberFieldElement_quadratic(NumberFieldElement_absolute):
 
         TESTS::
 
+            sage: import warnings
+            sage: warnings.filterwarnings("ignore", category=DeprecationWarning)
             sage: K2.<sqrt2> = QuadraticField(2)
             sage: K3.<sqrt3> = QuadraticField(3)
             sage: K5.<sqrt5> = QuadraticField(5)