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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package apd
import (
"fmt"
"testing"
)
func TestDecomposerRoundTrip(t *testing.T) {
list := []struct {
N string // Name.
S string // String value.
E bool // Expect an error.
}{
{N: "Zero", S: "0"},
{N: "Normal-1", S: "123.456"},
{N: "Normal-2", S: "-123.456"},
{N: "NaN-1", S: "NaN"},
{N: "NaN-2", S: "-NaN"},
{N: "Infinity-1", S: "Infinity"},
{N: "Infinity-2", S: "-Infinity"},
}
for _, item := range list {
t.Run(item.N, func(t *testing.T) {
d, _, err := NewFromString(item.S)
if err != nil {
t.Fatal(err)
}
set, set2 := &Decimal{}, &Decimal{}
f, n, c, e := d.Decompose(nil)
err = set.Compose(f, n, c, e)
if err == nil && item.E {
t.Fatal("expected error, got <nil>")
}
err = set2.Compose(f, n, c, e)
if err == nil && item.E {
t.Fatal("expected error, got <nil>")
}
if set.Cmp(set2) != 0 {
t.Fatalf("composing the same value twice resulted in different values. set=%v set2=%v", set, set2)
}
if err != nil && !item.E {
t.Fatalf("unexpected error: %v", err)
}
if set.Cmp(d) != 0 {
t.Fatalf("values incorrect, got %v want %v (%s)", set, d, item.S)
}
})
}
}
func TestDecomposerCompose(t *testing.T) {
list := []struct {
N string // Name.
S string // String value.
Form byte // Form
Neg bool
Coef []byte // Coefficent
Exp int32
Err bool // Expect an error.
}{
{N: "Zero", S: "0", Coef: nil, Exp: 0},
{N: "Normal-1", S: "123.456", Coef: []byte{0x01, 0xE2, 0x40}, Exp: -3},
{N: "Neg-1", S: "-123.456", Neg: true, Coef: []byte{0x01, 0xE2, 0x40}, Exp: -3},
{N: "PosExp-1", S: "123456000", Coef: []byte{0x01, 0xE2, 0x40}, Exp: 3},
{N: "PosExp-2", S: "-123456000", Neg: true, Coef: []byte{0x01, 0xE2, 0x40}, Exp: 3},
{N: "AllDec-1", S: "0.123456", Coef: []byte{0x01, 0xE2, 0x40}, Exp: -6},
{N: "AllDec-2", S: "-0.123456", Neg: true, Coef: []byte{0x01, 0xE2, 0x40}, Exp: -6},
{N: "NaN-1", S: "NaN", Form: 2},
{N: "NaN-2", S: "-NaN", Form: 2, Neg: true},
{N: "Infinity-1", S: "Infinity", Form: 1},
{N: "Infinity-2", S: "-Infinity", Form: 1, Neg: true},
}
for _, item := range list {
t.Run(item.N, func(t *testing.T) {
d, _, err := NewFromString(item.S)
if err != nil {
t.Fatal(err)
}
err = d.Compose(item.Form, item.Neg, item.Coef, item.Exp)
if err != nil && !item.Err {
t.Fatalf("unexpected error, got %v", err)
}
if item.Err {
if err == nil {
t.Fatal("expected error, got <nil>")
}
return
}
if s := fmt.Sprintf("%f", d); s != item.S {
t.Fatalf("unexpected value, got %q want %q", s, item.S)
}
})
}
}
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