dec_internal_test.go

Documentation: gopkg.in/inf.v0

     1  package inf
     2  
     3  import (
     4  	"math/big"
     5  	"testing"
     6  )
     7  
     8  var decQuoRemZZZ = []struct {
     9  	z, x, y  *Dec
    10  	r        *big.Rat
    11  	srA, srB int
    12  }{
    13  	// basic examples
    14  	{NewDec(1, 0), NewDec(2, 0), NewDec(2, 0), big.NewRat(0, 1), 0, 1},
    15  	{NewDec(15, 1), NewDec(3, 0), NewDec(2, 0), big.NewRat(0, 1), 0, 1},
    16  	{NewDec(1, 1), NewDec(1, 0), NewDec(10, 0), big.NewRat(0, 1), 0, 1},
    17  	{NewDec(0, 0), NewDec(2, 0), NewDec(3, 0), big.NewRat(2, 3), 1, 1},
    18  	{NewDec(0, 0), NewDec(2, 0), NewDec(6, 0), big.NewRat(1, 3), 1, 1},
    19  	{NewDec(1, 1), NewDec(2, 0), NewDec(12, 0), big.NewRat(2, 3), 1, 1},
    20  
    21  	// examples from the Go Language Specification
    22  	{NewDec(1, 0), NewDec(5, 0), NewDec(3, 0), big.NewRat(2, 3), 1, 1},
    23  	{NewDec(-1, 0), NewDec(-5, 0), NewDec(3, 0), big.NewRat(-2, 3), -1, 1},
    24  	{NewDec(-1, 0), NewDec(5, 0), NewDec(-3, 0), big.NewRat(-2, 3), 1, -1},
    25  	{NewDec(1, 0), NewDec(-5, 0), NewDec(-3, 0), big.NewRat(2, 3), -1, -1},
    26  }
    27  
    28  func TestDecQuoRem(t *testing.T) {
    29  	for i, a := range decQuoRemZZZ {
    30  		z, rA, rB := new(Dec), new(big.Int), new(big.Int)
    31  		s := scaleQuoExact{}.Scale(a.x, a.y)
    32  		z.quoRem(a.x, a.y, s, true, rA, rB)
    33  		if a.z.Cmp(z) != 0 || a.r.Cmp(new(big.Rat).SetFrac(rA, rB)) != 0 {
    34  			t.Errorf("#%d QuoRemZZZ got %v, %v, %v; expected %v, %v", i, z, rA, rB, a.z, a.r)
    35  		}
    36  		if a.srA != rA.Sign() || a.srB != rB.Sign() {
    37  			t.Errorf("#%d QuoRemZZZ wrong signs, got %v, %v; expected %v, %v", i, rA.Sign(), rB.Sign(), a.srA, a.srB)
    38  		}
    39  	}
    40  }
    41
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