increase test coverage

Author: picnixz

Lib/test/test_memoryview.py

@@ -666,6 +666,10 @@ def test_boolean_format(self):
         self.assertEqual(m2b.tolist(), [True, True, True])
         self.assertEqual(m2a, m2b)
 
+        allbytes = bytes(x for x in range(256))
+        allbytes = memoryview(allbytes).cast('?')
+        self.assertEqual(allbytes.tolist(), [False] + [True] * 255)
+
 
 class BytesMemorySliceTest(unittest.TestCase,
     BaseMemorySliceTests, BaseBytesMemoryTests):