// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package big
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import (
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"bytes"
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"encoding/gob"
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"encoding/json"
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"io"
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"testing"
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)
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var floatVals = []string{
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"0",
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"1",
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"0.1",
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"2.71828",
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"1234567890",
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"3.14e1234",
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"3.14e-1234",
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"0.738957395793475734757349579759957975985497e100",
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"0.73895739579347546656564656573475734957975995797598589749859834759476745986795497e100",
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"inf",
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"Inf",
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}
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func TestFloatGobEncoding(t *testing.T) {
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var medium bytes.Buffer
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enc := gob.NewEncoder(&medium)
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dec := gob.NewDecoder(&medium)
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for _, test := range floatVals {
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for _, sign := range []string{"", "+", "-"} {
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for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
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for _, mode := range []RoundingMode{ToNearestEven, ToNearestAway, ToZero, AwayFromZero, ToNegativeInf, ToPositiveInf} {
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medium.Reset() // empty buffer for each test case (in case of failures)
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x := sign + test
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var tx Float
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_, _, err := tx.SetPrec(prec).SetMode(mode).Parse(x, 0)
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if err != nil {
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t.Errorf("parsing of %s (%dbits, %v) failed (invalid test case): %v", x, prec, mode, err)
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continue
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}
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// If tx was set to prec == 0, tx.Parse(x, 0) assumes precision 64. Correct it.
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if prec == 0 {
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tx.SetPrec(0)
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}
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if err := enc.Encode(&tx); err != nil {
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t.Errorf("encoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
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continue
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}
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var rx Float
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if err := dec.Decode(&rx); err != nil {
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t.Errorf("decoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
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continue
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}
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if rx.Cmp(&tx) != 0 {
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t.Errorf("transmission of %s failed: got %s want %s", x, rx.String(), tx.String())
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continue
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}
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if rx.Prec() != prec {
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t.Errorf("transmission of %s's prec failed: got %d want %d", x, rx.Prec(), prec)
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}
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if rx.Mode() != mode {
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t.Errorf("transmission of %s's mode failed: got %s want %s", x, rx.Mode(), mode)
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}
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if rx.Acc() != tx.Acc() {
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t.Errorf("transmission of %s's accuracy failed: got %s want %s", x, rx.Acc(), tx.Acc())
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}
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}
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}
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}
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}
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}
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func TestFloatCorruptGob(t *testing.T) {
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var buf bytes.Buffer
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tx := NewFloat(4 / 3).SetPrec(1000).SetMode(ToPositiveInf)
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if err := gob.NewEncoder(&buf).Encode(tx); err != nil {
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t.Fatal(err)
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}
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b := buf.Bytes()
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var rx Float
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if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err != nil {
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t.Fatal(err)
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}
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if err := gob.NewDecoder(bytes.NewReader(b[:10])).Decode(&rx); err != io.ErrUnexpectedEOF {
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t.Errorf("got %v want EOF", err)
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}
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b[1] = 0
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if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err == nil {
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t.Fatal("got nil want version error")
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}
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}
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func TestFloatJSONEncoding(t *testing.T) {
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for _, test := range floatVals {
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for _, sign := range []string{"", "+", "-"} {
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for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
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x := sign + test
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var tx Float
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_, _, err := tx.SetPrec(prec).Parse(x, 0)
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if err != nil {
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t.Errorf("parsing of %s (prec = %d) failed (invalid test case): %v", x, prec, err)
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continue
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}
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b, err := json.Marshal(&tx)
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if err != nil {
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t.Errorf("marshaling of %v (prec = %d) failed: %v", &tx, prec, err)
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continue
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}
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var rx Float
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rx.SetPrec(prec)
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if err := json.Unmarshal(b, &rx); err != nil {
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t.Errorf("unmarshaling of %v (prec = %d) failed: %v", &tx, prec, err)
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continue
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}
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if rx.Cmp(&tx) != 0 {
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t.Errorf("JSON encoding of %v (prec = %d) failed: got %v want %v", &tx, prec, &rx, &tx)
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}
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}
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}
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}
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}
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