libgo: Update to current sources.

From-SVN: r192704

1 files changed, 66 insertions, 24 deletions

diff --git a/libgo/go/math/big/rat_test.go b/libgo/go/math/big/rat_test.go
index f7f31ae..7c63423 100644
--- a/libgo/go/math/big/rat_test.go
+++ b/libgo/go/math/big/rat_test.go
@@ -387,30 +387,19 @@ func TestRatGobEncoding(t *testing.T) {
 	var medium bytes.Buffer
 	enc := gob.NewEncoder(&medium)
 	dec := gob.NewDecoder(&medium)
-	for i, test := range gobEncodingTests {
-		for j := 0; j < 4; j++ {
-			medium.Reset() // empty buffer for each test case (in case of failures)
-			stest := test
-			if j&1 != 0 {
-				// negative numbers
-				stest = "-" + test
-			}
-			if j%2 != 0 {
-				// fractions
-				stest = stest + "." + test
-			}
-			var tx Rat
-			tx.SetString(stest)
-			if err := enc.Encode(&tx); err != nil {
-				t.Errorf("#%d%c: encoding failed: %s", i, 'a'+j, err)
-			}
-			var rx Rat
-			if err := dec.Decode(&rx); err != nil {
-				t.Errorf("#%d%c: decoding failed: %s", i, 'a'+j, err)
-			}
-			if rx.Cmp(&tx) != 0 {
-				t.Errorf("#%d%c: transmission failed: got %s want %s", i, 'a'+j, &rx, &tx)
-			}
+	for _, test := range encodingTests {
+		medium.Reset() // empty buffer for each test case (in case of failures)
+		var tx Rat
+		tx.SetString(test + ".14159265")
+		if err := enc.Encode(&tx); err != nil {
+			t.Errorf("encoding of %s failed: %s", &tx, err)
+		}
+		var rx Rat
+		if err := dec.Decode(&rx); err != nil {
+			t.Errorf("decoding of %s failed: %s", &tx, err)
+		}
+		if rx.Cmp(&tx) != 0 {
+			t.Errorf("transmission of %s failed: got %s want %s", &tx, &rx, &tx)
 		}
 	}
 }
@@ -454,3 +443,56 @@ func TestIssue2379(t *testing.T) {
 		t.Errorf("5) got %s want %s", x, q)
 	}
 }
+
+func TestIssue3521(t *testing.T) {
+	a := new(Int)
+	b := new(Int)
+	a.SetString("64375784358435883458348587", 0)
+	b.SetString("4789759874531", 0)
+
+	// 0) a raw zero value has 1 as denominator
+	zero := new(Rat)
+	one := NewInt(1)
+	if zero.Denom().Cmp(one) != 0 {
+		t.Errorf("0) got %s want %s", zero.Denom(), one)
+	}
+
+	// 1a) a zero value remains zero independent of denominator
+	x := new(Rat)
+	x.Denom().Set(new(Int).Neg(b))
+	if x.Cmp(zero) != 0 {
+		t.Errorf("1a) got %s want %s", x, zero)
+	}
+
+	// 1b) a zero value may have a denominator != 0 and != 1
+	x.Num().Set(a)
+	qab := new(Rat).SetFrac(a, b)
+	if x.Cmp(qab) != 0 {
+		t.Errorf("1b) got %s want %s", x, qab)
+	}
+
+	// 2a) an integral value becomes a fraction depending on denominator
+	x.SetFrac64(10, 2)
+	x.Denom().SetInt64(3)
+	q53 := NewRat(5, 3)
+	if x.Cmp(q53) != 0 {
+		t.Errorf("2a) got %s want %s", x, q53)
+	}
+
+	// 2b) an integral value becomes a fraction depending on denominator
+	x = NewRat(10, 2)
+	x.Denom().SetInt64(3)
+	if x.Cmp(q53) != 0 {
+		t.Errorf("2b) got %s want %s", x, q53)
+	}
+
+	// 3) changing the numerator/denominator of a Rat changes the Rat
+	x.SetFrac(a, b)
+	a = x.Num()
+	b = x.Denom()
+	a.SetInt64(5)
+	b.SetInt64(3)
+	if x.Cmp(q53) != 0 {
+		t.Errorf("3) got %s want %s", x, q53)
+	}
+}