Tighten up some warning filters, and break some dependencies on the
order in which the tests are normally run.
diff --git a/Lib/test/test_coercion.py b/Lib/test/test_coercion.py
index 4be762e..afade35 100644
--- a/Lib/test/test_coercion.py
+++ b/Lib/test/test_coercion.py
@@ -112,6 +112,7 @@
 
 warnings.filterwarnings("ignore",
                         r'complex divmod\(\), // and % are deprecated',
-                        DeprecationWarning)
+                        DeprecationWarning,
+                        r'test_coercion$')
 do_infix_binops()
 do_prefix_binops()