use addCleanup

Lib/test/test_linecache.py

@@ -81,9 +81,9 @@ class LineCacheTests(unittest.TestCase):
 
     def test_checkcache(self):
         getline = linecache.getline
-        try:
         # Create a source file and cache its contents
         source_name = support.TESTFN + '.py'
+        self.addCleanup(test_support.unlink, source_name)
         with open(source_name, 'w') as source:
             source.write(SOURCE_1)
         getline(source_name, 1)
@@ -112,9 +112,6 @@ class LineCacheTests(unittest.TestCase):
                 self.assertEquals(line, getline(source_name, index + 1))
                 source_list.append(line)
 
-        finally:
-            support.unlink(source_name)
-
 def test_main():
     support.run_unittest(LineCacheTests)