floats/exp64_test.go at main · shogo82148/floats · GitHub

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package floats

import (
	"math"
	"runtime"
	"testing"
)

func TestFloat64_Exp(t *testing.T) {
	tests := []struct {
		x    Float64
		want float64
	}{
		{exact64(0), math.Exp(0)},
		{exact64(1), math.Exp(1)},
		{exact64(2), math.Exp(2)},
		{exact64(3), math.Exp(3)},
		{exact64(4), math.Exp(4)},
		{exact64(11), math.Exp(11)},
	}

	for _, tt := range tests {
		got := tt.x.Exp()
		if !close64(got, tt.want) {
			t.Errorf("Exp(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}

	strictTests := []struct {
		x    Float64
		want Float64
	}{
		// special cases
		{exact64(math.Inf(1)), exact64(math.Inf(1))},
		{exact64(math.NaN()), exact64(math.NaN())},
	}

	for _, tt := range strictTests {
		got := tt.x.Exp()
		if !eq64(got, tt.want) {
			t.Errorf("Exp(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}
}

func BenchmarkFloat64_Exp(b *testing.B) {
	x := exact64(1.5)
	for b.Loop() {
		runtime.KeepAlive(x.Exp())
	}
}

func TestFloat64_Exp2(t *testing.T) {
	tests := []struct {
		x    Float64
		want float64
	}{
		{exact64(0), math.Exp2(0)},
		{exact64(1), math.Exp2(1)},
		{exact64(1.5), math.Exp2(1.5)},
	}

	for _, tt := range tests {
		got := tt.x.Exp2()
		if !close64(got, tt.want) {
			t.Errorf("Exp2(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}

	strictTests := []struct {
		x    Float64
		want Float64
	}{
		// special cases
		{exact64(math.Inf(1)), exact64(math.Inf(1))},
		{exact64(math.NaN()), exact64(math.NaN())},
	}

	for _, tt := range strictTests {
		got := tt.x.Exp2()
		if !eq64(got, tt.want) {
			t.Errorf("Exp2(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}
}