test: error message on %i format

Author: ApostolFet

Lib/test/test_bytes.py

@@ -5,6 +5,7 @@
 """
 
 import array
+import operator
 import os
 import re
 import sys
@@ -751,6 +752,8 @@ def check(fmt, vals, result):
         check(b'%i%b %*.*b', (10, b'3', 5, 3, b'abc',), b'103   abc')
         check(b'%c', b'a', b'a')
 
+        self.assertRaisesRegex(TypeError, '%i format: a real number is required, not complex', operator.mod, '%i', 2j)
+
     def test_imod(self):
         b = self.type2test(b'hello, %b!')
         orig = b