added tests for issue #2

rw_test.go

@@ -0,0 +1,134 @@
+package wav
+
+import (
+	"io/ioutil"
+	"math"
+	"os"
+	"testing"
+)
+
+func TestWriteRead_Int32(t *testing.T) {
+	const (
+		bits = 32
+		rate = 44100
+	)
+
+	f, err := ioutil.TempFile("", "wavPkgtest")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	testFname := f.Name()
+
+	meta := File{
+		Channels:        1,
+		SampleRate:      rate,
+		SignificantBits: bits,
+	}
+
+	writer, err := meta.NewWriter(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var freq float64
+	freq = 0.0001
+
+	// one second
+	for n := 0; n < rate; n += 1 {
+		y := int32(0.8 * math.Pow(2, bits-1) * math.Sin(freq*float64(n)))
+		freq += 0.000002
+
+		err = writer.WriteInt32(y)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	err = writer.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err = os.Open(testFname)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stat, err := f.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = NewReader(f, stat.Size())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	os.Remove(testFname)
+}
+
+func TestWriteRead_Sample(t *testing.T) {
+	const (
+		bits = 16
+		rate = 44100
+	)
+
+	f, err := ioutil.TempFile("", "wavPkgtest")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	testFname := f.Name()
+
+	meta := File{
+		Channels:        1,
+		SampleRate:      rate,
+		SignificantBits: bits,
+	}
+
+	writer, err := meta.NewWriter(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var freq float64
+	freq = 0.0001
+
+	var s = make([]byte, 2)
+	// one second
+	for n := 0; n < rate; n += 1 {
+		y := int32(0.8 * math.Pow(2, bits-1) * math.Sin(freq*float64(n)))
+		freq += 0.000002
+
+		// s[3] = byte((y >> 24) & 0xFF)
+		// s[2] = byte((y >> 16) & 0xFF)
+		s[1] = byte((y >> 8) & 0xFF)
+		s[0] = byte(y & 0xFF)
+
+		err = writer.WriteSample(s)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	err = writer.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err = os.Open(testFname)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stat, err := f.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = NewReader(f, stat.Size())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	os.Remove(testFname)
+}