From cedde63fe8c4cdcca9f557ec4e4f56cab7835b3e Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 30 Jun 2016 08:12:09 +0530
Subject: [PATCH] Ensure test matching does not return dupes

---
 src/calibre/utils/run_tests.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/calibre/utils/run_tests.py b/src/calibre/utils/run_tests.py
index bea6201f35..3c409db947 100644
--- a/src/calibre/utils/run_tests.py
+++ b/src/calibre/utils/run_tests.py
@@ -82,9 +82,11 @@ def init_env():
 
 def filter_tests(suite, test_ok):
     ans = unittest.TestSuite()
+    added = set()
     for test in itertests(suite):
-        if test_ok(test):
+        if test_ok(test) and test not in added:
             ans.addTest(test)
+            added.add(test)
     return ans
 
 def filter_tests_by_name(suite, *names):