Fix str() and repr() of empty sets.
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 556e390..03621a6 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -631,7 +631,7 @@
         self.set    = set(self.values)
         self.dup    = set(self.values)
         self.length = 0
-        self.repr   = "{}"
+        self.repr   = "set()"
 
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