math/big: add test cases for min/max exponent values

Change-Id: I2e74e39628285e2fecaab712be6cff230619a6c2
Reviewed-on: https://go-review.googlesource.com/14778
Reviewed-by: Alan Donovan <adonovan@google.com>

diff --git a/src/math/big/floatconv_test.go b/src/math/big/floatconv_test.go
index b755b98c3a7389087eec7ea0e048e6afd523b2b4..b19152662db0e2e786295a3fffed8064acb27866 100644 (file)
--- a/src/math/big/floatconv_test.go
+++ b/src/math/big/floatconv_test.go
@@ -367,10 +367,20 @@ func TestFloatText(t *testing.T) {
 
                // make sure "stupid" exponents don't stall the machine
                {"1e1000000", 64, 'p', 0, "0x.88b3a28a05eade3ap+3321929"},
+               {"1e646456992", 64, 'p', 0, "0x.e883a0c5c8c7c42ap+2147483644"},
+               {"1e646456993", 64, 'p', 0, "+Inf"},
                {"1e1000000000", 64, 'p', 0, "+Inf"},
                {"1e-1000000", 64, 'p', 0, "0x.efb4542cc8ca418ap-3321928"},
+               {"1e-646456993", 64, 'p', 0, "0x.e17c8956983d9d59p-2147483647"},
+               {"1e-646456994", 64, 'p', 0, "0"},
                {"1e-1000000000", 64, 'p', 0, "0"},
 
+               // minimum and maximum values
+               {"1p2147483646", 64, 'p', 0, "0x.8p+2147483647"},
+               {"0x.8p2147483647", 64, 'p', 0, "0x.8p+2147483647"},
+               {"0x.8p-2147483647", 64, 'p', 0, "0x.8p-2147483647"},
+               {"1p-2147483649", 64, 'p', 0, "0x.8p-2147483648"},
+
                // TODO(gri) need tests for actual large Floats
 
                {"0", 53, 'b', 0, "0"},