Closes #15676: mmap: add empty file check prior to offset check
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index 2c2863e..31b3695 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -466,6 +466,22 @@
f.flush ()
return mmap.mmap (f.fileno(), 0)
+ def test_empty_file (self):
+ f = open (TESTFN, 'w+b')
+ f.close()
+ f = open(TESTFN, "rb")
+ try:
+ m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
+ m.close()
+ f.close()
+ self.fail("should not have been able to mmap empty file")
+ except ValueError as e:
+ f.close()
+ self.assertEqual(e.message, "cannot mmap an empty file")
+ except:
+ f.close()
+ self.fail("unexpected exception: " + str(e))
+
def test_offset (self):
f = open (TESTFN, 'w+b')