av/stream/flac: cleaned up testing file

stream/flac/flac_test.go

@@ -64,29 +64,43 @@ func TestWriteSeekerWrite(t *testing.T) {
 func TestWriteSeekerSeek(t *testing.T) {
 	ws := &writeSeeker{}
 
-	ws.Write([]byte("hello"))
-	if string(ws.buf) != "hello" {
-		t.Fail()
+	const tstStr1 = "hello"
+	want1 := tstStr1
+	ws.Write([]byte(tstStr1))
+	got := string(ws.buf)
+	if got != tstStr1 {
+		t.Errorf("Unexpected output, got: %v, want: %v", got, want1)
 	}
 
-	ws.Write([]byte(" world"))
-	if string(ws.buf) != "hello world" {
-		t.Fail()
+	const tstStr2 = " world"
+	const want2 = tstStr1 + tstStr2
+	ws.Write([]byte(tstStr2))
+	got = string(ws.buf)
+	if got != want2 {
+		t.Errorf("Unexpected output, got: %v, want: %v", got, want2)
 	}
 
+	const tstStr3 = "k!"
+	const want3 = "hello work!"
 	ws.Seek(-2, io.SeekEnd)
-	ws.Write([]byte("k!"))
-	if string(ws.buf) != "hello work!" {
-		t.Fail()
+	ws.Write([]byte(tstStr3))
+	got = string(ws.buf)
+	if got != want3 {
+		t.Errorf("Unexpected output, got: %v, want: %v", got, want3)
 	}
 
+	const tstStr4 = "gopher"
+	const want4 = "hello gopher"
 	ws.Seek(6, io.SeekStart)
-	ws.Write([]byte("gopher"))
-	if string(ws.buf) != "hello gopher" {
-		t.Fail()
+	ws.Write([]byte(tstStr4))
+	got = string(ws.buf)
+	if got != want4 {
+		t.Errorf("Unexpected output, got: %v, want: %v", got, want4)
 	}
 }
 
+// TestDecodeFlac checks that we can load a flac file and decode to wav, writing
+// to a wav file.
 func TestDecodeFlac(t *testing.T) {
 	b, err := ioutil.ReadFile(testFile)
 	if err != nil {