Fix Ascii85 test from mainline

Author: kangtastic

Lib/test/test_base64.py

@@ -664,17 +664,20 @@ def test_a85encode_wrapcol(self):
            b'<~\nGB\n\\6\n`E\n-Z\nP=\nDf\n.1\nGE\nb>\n~>')
         eq(base64.a85encode(b, wrapcol=sys.maxsize), b'GB\\6`E-ZP=Df.1GEb>')
         if check_impl_detail():
-            eq(base64.a85encode(b, wrapcol=2**1000), b'GB\\6`E-ZP=Df.1GEb>')
-            eq(base64.a85encode(b, wrapcol=-7),
-               b'G\nB\n\\\n6\n`\nE\n-\nZ\nP\n=\nD\nf\n.\n1\nG\nE\nb\n>')
-            eq(base64.a85encode(b, wrapcol=-7, adobe=True),
-               b'<~\nGB\n\\6\n`E\n-Z\nP=\nDf\n.1\nGE\nb>\n~>')
+            eq(base64.a85encode(b, wrapcol=sys.maxsize*2),
+                                b'GB\\6`E-ZP=Df.1GEb>')
+            with self.assertRaises(OverflowError):
+                base64.a85encode(b, wrapcol=2**1000)
+        with self.assertRaises(ValueError):
+            base64.a85encode(b, wrapcol=-7)
+        with self.assertRaises(ValueError):
+            base64.a85encode(b, wrapcol=-7, adobe=True)
         with self.assertRaises(TypeError):
             base64.a85encode(b, wrapcol=7.0)
         with self.assertRaises(TypeError):
             base64.a85encode(b, wrapcol='7')
-        if check_impl_detail():
-            eq(base64.a85encode(b, wrapcol=None), b'GB\\6`E-ZP=Df.1GEb>')
+        with self.assertRaises(TypeError):
+            base64.a85encode(b, wrapcol=None)
         eq(base64.a85encode(b'', wrapcol=0), b'')
         eq(base64.a85encode(b'', wrapcol=7), b'')
         eq(base64.a85encode(b'', wrapcol=1, adobe=True), b'<~\n~>')