notes_test.go

package snd

import "testing"

func TestNotes(t *testing.T) {
	// values sourced from wikipedia and may be rounded:
	// https://en.wikipedia.org/wiki/Piano_key_frequencies
	want := []float64{
		27.5000, 29.1352, 30.8677, 32.7032, 34.6478, 36.7081, 38.8909, 41.2034,
		43.6535, 46.2493, 48.9994, 51.9131, 55.0000, 58.2705, 61.7354, 65.4064,
		69.2957, 73.4162, 77.7817, 82.4069, 87.3071, 92.4986, 97.9989, 103.826,
		110.000, 116.541, 123.471, 130.813, 138.591, 146.832, 155.563, 164.814,
		174.614, 184.997, 195.998, 207.652, 220.000, 233.082, 246.942, 261.626,
		277.183, 293.665, 311.127, 329.628, 349.228, 369.994, 391.995, 415.305,
		440.000, 466.164, 493.883, 523.251, 554.365, 587.330, 622.254, 659.255,
		698.456, 739.989, 783.991, 830.609, 880.000, 932.328, 987.767, 1046.50,
		1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1479.98, 1567.98, 1661.22,
		1760.00, 1864.66, 1975.53, 2093.00, 2217.46, 2349.32, 2489.02, 2637.02,
		2793.83, 2959.96, 3135.96, 3322.44, 3520.00, 3729.31, 3951.07, 4186.01,
	}

	notes := Notes(make([]float64, 88))
	notes.Eval(12, 440, 48, EqualTempermantFunc)

	for i, x := range notes {
		if !equaleps(x, want[i], 0.01) {
			t.Errorf("note(%v) have %v, want %v", i, x, want[i])
		}
	}
}