chebyshevt_test.go

package special_test

import (
	"fmt"
	"testing"

	. "github.com/scientificgo/special"
)

var casesChebyshevT = []struct {
	In1      int
	In2, Out float64
}{
	{10, nan, nan},
	{2, -inf, inf},
	{3, -inf, -inf},
	{0, 1e5, 1},
	{1, 2.32, 2.32},
	{2, 0, -1},
	{2, 1, 1},
	{3, 0, 0},
	{3, -1.4, -6.776},
	{3, -4.4, -327.536},
	{10, 1.5, 7563.5},
	{10, 2.5, 3.1878115e+06},
	{-10, 2.5, 3.1878115e+06},
	{16, 1.99, 6.4547281837215034665541948954599646855168e+08},
	{16, 2.01, 7.7645467147944436800278539843101104570368e+08},
	{21, 1.99, 4.5397997222940012819233231892806517536441070434281062e+11},
	{21, 2.01, 5.7856114552320908000776537065472996521518573992122777e+11},
	{33, 1.1, 1.137797818669236239727592226862531608576e+06},
	{33, 11.1, 1.2573303347299275791374654815312863736714899871905607e+44},
	{45, 1.1, 2.33204023744382373329089820779559738469382871230447616e+08},
	{49, 0.8, 0.9933225511631933137689172339171888803034293075968},
	{50, 0.8, 0.72543585253527006118086083303004714053466679410688},
	{104, 1.01, 1.20554806345269569487292725745680604127300849997758017e+06},
	{104, 2.01, 2.7632467820681488252250407833556540138929819278563989e+59},
	{500, 0.99, -0.08380355257963498672175647692443430558653333875743719137},
	{500, 1.99, 2.5992231515700692225279870727691535302914749336133571e+284},
	{500, 2.01, 8.3615293546276484931403502395120260481233491510195613e+286},
	{500, -2.01, 8.3615293546276484931403502395120260481233491510195613e+286},
}

func TestChebyshevT(t *testing.T) {
	for i, c := range casesChebyshevT {
		t.Run(fmt.Sprintf("%v", i), func(tt *testing.T) {
			res := ChebyshevT(c.In1, c.In2)
			ok := equalFloat64(res, c.Out)
			if !ok {
				tt.Errorf("Got %v, want %v", res, c.Out)
			}
		})
	}
}