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109 lines
4.3 KiB
Go
109 lines
4.3 KiB
Go
package inf_test
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import (
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"math/big"
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"testing"
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"gopkg.in/inf.v0"
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)
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var decRounderInputs = [...]struct {
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quo *inf.Dec
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rA, rB *big.Int
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}{
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// examples from go language spec
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{inf.NewDec(1, 0), big.NewInt(2), big.NewInt(3)}, // 5 / 3
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{inf.NewDec(-1, 0), big.NewInt(-2), big.NewInt(3)}, // -5 / 3
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{inf.NewDec(-1, 0), big.NewInt(2), big.NewInt(-3)}, // 5 / -3
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{inf.NewDec(1, 0), big.NewInt(-2), big.NewInt(-3)}, // -5 / -3
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// examples from godoc
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{inf.NewDec(-1, 1), big.NewInt(-8), big.NewInt(10)},
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{inf.NewDec(-1, 1), big.NewInt(-5), big.NewInt(10)},
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{inf.NewDec(-1, 1), big.NewInt(-2), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(-8), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(-5), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(-2), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(0), big.NewInt(1)},
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{inf.NewDec(0, 1), big.NewInt(2), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(5), big.NewInt(10)},
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{inf.NewDec(0, 1), big.NewInt(8), big.NewInt(10)},
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{inf.NewDec(1, 1), big.NewInt(2), big.NewInt(10)},
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{inf.NewDec(1, 1), big.NewInt(5), big.NewInt(10)},
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{inf.NewDec(1, 1), big.NewInt(8), big.NewInt(10)},
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}
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var decRounderResults = [...]struct {
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rounder inf.Rounder
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results [len(decRounderInputs)]*inf.Dec
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}{
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{inf.RoundExact, [...]*inf.Dec{nil, nil, nil, nil,
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nil, nil, nil, nil, nil, nil,
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inf.NewDec(0, 1), nil, nil, nil, nil, nil, nil}},
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{inf.RoundDown, [...]*inf.Dec{
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inf.NewDec(1, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(1, 0),
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inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(0, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}},
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{inf.RoundUp, [...]*inf.Dec{
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inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
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inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1),
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inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
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inf.NewDec(0, 1),
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inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
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inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
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{inf.RoundHalfDown, [...]*inf.Dec{
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inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
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inf.NewDec(-2, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
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inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(0, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1),
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inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(2, 1)}},
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{inf.RoundHalfUp, [...]*inf.Dec{
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inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
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inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1),
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inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(0, 1),
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inf.NewDec(0, 1),
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inf.NewDec(0, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
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inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
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{inf.RoundHalfEven, [...]*inf.Dec{
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inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0),
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inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1),
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inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(0, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1),
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inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
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{inf.RoundFloor, [...]*inf.Dec{
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inf.NewDec(1, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(1, 0),
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inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1),
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inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
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inf.NewDec(0, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}},
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{inf.RoundCeil, [...]*inf.Dec{
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inf.NewDec(2, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(2, 0),
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inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1),
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inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1),
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inf.NewDec(0, 1),
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inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1),
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inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}},
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}
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func TestDecRounders(t *testing.T) {
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for i, a := range decRounderResults {
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for j, input := range decRounderInputs {
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q := new(inf.Dec).Set(input.quo)
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rA, rB := new(big.Int).Set(input.rA), new(big.Int).Set(input.rB)
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res := a.rounder.Round(new(inf.Dec), q, rA, rB)
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if a.results[j] == nil && res == nil {
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continue
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}
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if (a.results[j] == nil && res != nil) ||
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(a.results[j] != nil && res == nil) ||
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a.results[j].Cmp(res) != 0 {
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t.Errorf("#%d,%d Rounder got %v; expected %v", i, j, res, a.results[j])
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}
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}
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}
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}
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