Slowing down rapid URL retrievals for nosetests.

pdbfixer/tests/test_removechains.py

@@ -30,6 +30,8 @@ def remove_chain_indices_and_verify(pdbid, chain_indices_to_remove, expected_cha
     # Check to make sure asserted chains remain.
     chain_ids_remaining = [c.id for c in fixer.topology.chains()]
     assert_list_equal(chain_ids_remaining, expected_chain_ids_remaining)
+    # Slow down to prevent rapid URL retrievals
+    time.sleep(1)
 
 def test_removechain_indices():
     remove_chain_indices_and_verify('4JSV', [], ['B', 'D', 'A', 'C', 'B', 'A'])