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--- a/run_tests
+++ b/run_tests
@@ -2,6 +2,9 @@
 
 # Executes nosetest for each forge application in sequence.
 # Additional parameters passed to this script (such as --failed) will be passed to nosetest.
+
+# Remove existing .test-data directories; start each test run with clean data
+find . -name '.test-data' -type d | xargs rm -r
 
 for APP in pyforge *Forge*
 do