Issue #23838: linecache now clears the cache and returns an empty result on

MemoryError.

1 files changed, 16 insertions, 3 deletions

diff --git a/Lib/test/test_linecache.py b/Lib/test/test_linecache.py
index 5fe0554..79157de 100644
--- a/Lib/test/test_linecache.py
+++ b/Lib/test/test_linecache.py
@@ -126,8 +126,21 @@ class LineCacheTests(unittest.TestCase):
                 self.assertEqual(line, getline(source_name, index + 1))
                 source_list.append(line)
 
-def test_main():
-    support.run_unittest(LineCacheTests)
+    def test_memoryerror(self):
+        lines = linecache.getlines(FILENAME)
+        self.assertTrue(lines)
+        def raise_memoryerror(*args, **kwargs):
+            raise MemoryError
+        with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
+            lines2 = linecache.getlines(FILENAME)
+        self.assertEqual(lines2, lines)
+
+        linecache.clearcache()
+        with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
+            lines3 = linecache.getlines(FILENAME)
+        self.assertEqual(lines3, [])
+        self.assertEqual(linecache.getlines(FILENAME), lines)
+
 
 if __name__ == "__main__":
-    test_main()
+    unittest.main()