strconv/itoa: add test to generate the longest output string possible by formatBits

The new test case produces the longest string representation possible and thereby uses
all of the 65 bytes in the buffer array used by the formatBits function.

Change-Id: I11320c4de56ced5ff098b7e37f1be08e456573e2
Reviewed-on: https://go-review.googlesource.com/2108
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/strconv/itoa_test.go b/src/strconv/itoa_test.go
index e0213ae9afecd4d1540b2644f9a255abaa321cd7..48dc03e839081cc90c28f800098b21678701925f 100644 (file)
--- a/src/strconv/itoa_test.go
+++ b/src/strconv/itoa_test.go
@@ -51,6 +51,7 @@ var itob64tests = []itob64Test{
        {-0x123456789abcdef, 16, "-123456789abcdef"},
        {1<<63 - 1, 16, "7fffffffffffffff"},
        {1<<63 - 1, 2, "111111111111111111111111111111111111111111111111111111111111111"},
+       {-1 << 63, 2, "-1000000000000000000000000000000000000000000000000000000000000000"},
 
        {16, 17, "g"},
        {25, 25, "10"},