package pcm

import (
	"bytes"
	"io/ioutil"
	"log"
	"testing"
)

// TestResample accepts an input pcm file (assumed to be mono and using 16-bit samples) and outputs a resampled pcm file.
// Input and output file names can be specified as arguments.
func TestResample(t *testing.T) {
	inPath := "../../../test/test-data/av/input/sweep_400Hz_20000Hz_-3dBFS_5s_48khz.pcm"
	expPath := "../../../test/test-data/av/output/sweep_400Hz_20000Hz_resampled_48to8kHz.pcm"

	// Read input pcm.
	inPcm, err := ioutil.ReadFile(inPath)
	if err != nil {
		log.Fatal(err)
	}

	// Resample pcm.
	resampled, err := Resample(inPcm, 48000, 8000, 1, 16)
	if err != nil {
		log.Fatal(err)
	}

	// Read expected resampled pcm.
	exp, err := ioutil.ReadFile(expPath)
	if err != nil {
		log.Fatal(err)
	}

	// Compare result with expected.
	if !bytes.Equal(resampled, exp) {
		t.Error("Resampled data does not match expected result.")
	}
}