File: rounder_test.go

package info (click to toggle)
golang-gopkg-inf.v0 0.9.1-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, bullseye-proposed-updates, sid
  • size: 128 kB
  • sloc: makefile: 2
file content (109 lines) | stat: -rw-r--r-- 4,454 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
package inf_test

import (
	"math/big"
	"testing"

	"gopkg.in/inf.v0"
)

var decRounderInputs = [...]struct {
	quo    *inf.Dec
	rA, rB *big.Int
}{
	// examples from go language spec
	{inf.NewDec(1, 0), big.NewInt(2), big.NewInt(3)},   //  5 /  3
	{inf.NewDec(-1, 0), big.NewInt(-2), big.NewInt(3)}, // -5 /  3
	{inf.NewDec(-1, 0), big.NewInt(2), big.NewInt(-3)}, //  5 / -3
	{inf.NewDec(1, 0), big.NewInt(-2), big.NewInt(-3)}, // -5 / -3
	// examples from godoc
	{inf.NewDec(-1, 1), big.NewInt(-8), big.NewInt(10)},
	{inf.NewDec(-1, 1), big.NewInt(-5), big.NewInt(10)},
	{inf.NewDec(-1, 1), big.NewInt(-2), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(-8), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(-5), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(-2), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(0), big.NewInt(1)},
	{inf.NewDec(0, 1), big.NewInt(2), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(5), big.NewInt(10)},
	{inf.NewDec(0, 1), big.NewInt(8), big.NewInt(10)},
	{inf.NewDec(1, 1), big.NewInt(2), big.NewInt(10)},
	{inf.NewDec(1, 1), big.NewInt(5), big.NewInt(10)},
	{inf.NewDec(1, 1), big.NewInt(8), big.NewInt(10)},
}

var decRounderResults = [...]struct {
	rounder inf.Rounder
	results [len(decRounderInputs)]*inf.Dec
}{
	{inf.RoundExact, [...]*inf.Dec{nil, nil, nil, nil,
		nil, nil, nil, nil, nil, nil,
		inf.NewDec(0, 1), nil, nil, nil, nil, nil, nil}},
	{inf.RoundDown, [...]*inf.Dec{
		inf.NewDec(1, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(1, 0),
		inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(0, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}},
	{inf.RoundUp, [...]*inf.Dec{
		inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
		inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1),
		inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
		inf.NewDec(0, 1),
		inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
		inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
	{inf.RoundHalfDown, [...]*inf.Dec{
		inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
		inf.NewDec(-2, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
		inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(0, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1),
		inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(2, 1)}},
	{inf.RoundHalfUp, [...]*inf.Dec{
		inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
		inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1),
		inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(0, 1),
		inf.NewDec(0, 1),
		inf.NewDec(0, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
		inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
	{inf.RoundHalfEven, [...]*inf.Dec{
		inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
		inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1),
		inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(0, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1),
		inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
	{inf.RoundFloor, [...]*inf.Dec{
		inf.NewDec(1, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(1, 0),
		inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1),
		inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
		inf.NewDec(0, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}},
	{inf.RoundCeil, [...]*inf.Dec{
		inf.NewDec(2, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(2, 0),
		inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
		inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
		inf.NewDec(0, 1),
		inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
		inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
}

func TestDecRounders(t *testing.T) {
	for i, a := range decRounderResults {
		for j, input := range decRounderInputs {
			q := new(inf.Dec).Set(input.quo)
			rA, rB := new(big.Int).Set(input.rA), new(big.Int).Set(input.rB)
			res := a.rounder.Round(new(inf.Dec), q, rA, rB)
			if a.results[j] == nil && res == nil {
				continue
			}
			if (a.results[j] == nil && res != nil) ||
				(a.results[j] != nil && res == nil) ||
				a.results[j].Cmp(res) != 0 {
				t.Errorf("#%d,%d Rounder got %v; expected %v", i, j, res, a.results[j])
			}
		}
	}
}