1 files changed, 82 insertions, 0 deletions
diff --git a/libgo/go/math/big/floatmarsh_test.go b/libgo/go/math/big/floatmarsh_test.go
index d7ef2fca68..5bd906ddae 100644
--- a/libgo/go/math/big/floatmarsh_test.go
+++ b/libgo/go/math/big/floatmarsh_test.go
@@ -5,7 +5,10 @@
 package big
 
 import (
+	"bytes"
+	"encoding/gob"
 	"encoding/json"
+	"io"
 	"testing"
 )
 
@@ -23,6 +26,85 @@ var floatVals = []string{
 	"Inf",
 }
 
+func TestFloatGobEncoding(t *testing.T) {
+	var medium bytes.Buffer
+	enc := gob.NewEncoder(&medium)
+	dec := gob.NewDecoder(&medium)
+	for _, test := range floatVals {
+		for _, sign := range []string{"", "+", "-"} {
+			for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
+				for _, mode := range []RoundingMode{ToNearestEven, ToNearestAway, ToZero, AwayFromZero, ToNegativeInf, ToPositiveInf} {
+					medium.Reset() // empty buffer for each test case (in case of failures)
+					x := sign + test
+
+					var tx Float
+					_, _, err := tx.SetPrec(prec).SetMode(mode).Parse(x, 0)
+					if err != nil {
+						t.Errorf("parsing of %s (%dbits, %v) failed (invalid test case): %v", x, prec, mode, err)
+						continue
+					}
+
+					// If tx was set to prec == 0, tx.Parse(x, 0) assumes precision 64. Correct it.
+					if prec == 0 {
+						tx.SetPrec(0)
+					}
+
+					if err := enc.Encode(&tx); err != nil {
+						t.Errorf("encoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
+						continue
+					}
+
+					var rx Float
+					if err := dec.Decode(&rx); err != nil {
+						t.Errorf("decoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
+						continue
+					}
+
+					if rx.Cmp(&tx) != 0 {
+						t.Errorf("transmission of %s failed: got %s want %s", x, rx.String(), tx.String())
+						continue
+					}
+
+					if rx.Prec() != prec {
+						t.Errorf("transmission of %s's prec failed: got %d want %d", x, rx.Prec(), prec)
+					}
+
+					if rx.Mode() != mode {
+						t.Errorf("transmission of %s's mode failed: got %s want %s", x, rx.Mode(), mode)
+					}
+
+					if rx.Acc() != tx.Acc() {
+						t.Errorf("transmission of %s's accuracy failed: got %s want %s", x, rx.Acc(), tx.Acc())
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestFloatCorruptGob(t *testing.T) {
+	var buf bytes.Buffer
+	tx := NewFloat(4 / 3).SetPrec(1000).SetMode(ToPositiveInf)
+	if err := gob.NewEncoder(&buf).Encode(tx); err != nil {
+		t.Fatal(err)
+	}
+	b := buf.Bytes()
+
+	var rx Float
+	if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := gob.NewDecoder(bytes.NewReader(b[:10])).Decode(&rx); err != io.ErrUnexpectedEOF {
+		t.Errorf("got %v want EOF", err)
+	}
+
+	b[1] = 0
+	if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err == nil {
+		t.Fatal("got nil want version error")
+	}
+}
+
 func TestFloatJSONEncoding(t *testing.T) {
 	for _, test := range floatVals {
 		for _, sign := range []string{"", "+", "-"} {