test: remove a changed test that wasn't supposed to be part of bb73791

Author: nedbat

tests/test_data.py

@@ -486,14 +486,10 @@ def test_read_and_write_are_opposites(self):
 
     def test_thread_stress(self):
         covdata = CoverageData()
-        exceptions = []
 
         def thread_main():
             """Every thread will try to add the same data."""
-            try:
-                covdata.add_lines(LINES_1)
-            except Exception as ex:
-                exceptions.append(ex)
+            covdata.add_lines(LINES_1)
 
         threads = [threading.Thread(target=thread_main) for _ in range(10)]
         for t in threads:
@@ -502,7 +498,6 @@ def thread_main():
             t.join()
 
         self.assert_lines1_data(covdata)
-        #assert exceptions == []
 
 
 class CoverageDataInTempDirTest(DataTestHelpers, CoverageTest):