codec/wav: Add unit tests for wav encoder

codec/wav/wav_test.go

@@ -0,0 +1,73 @@
+/*
+NAME
+  wav.go
+
+DESCRIPTION
+  wav.go contains functions for processing wav.
+
+AUTHOR
+  David Sutton <davidsutton@ausocean.org>
+
+LICENSE
+  wav.go is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
+
+  It is free software: you can redistribute it and/or modify them
+  under the terms of the GNU General Public License as published by the
+  Free Software Foundation, either version 3 of the License, or (at your
+  option) any later version.
+
+  It is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+  for more details.
+
+  You should have received a copy of the GNU General Public License in gpl.txt.
+  If not, see [GNU licenses](http://www.gnu.org/licenses).
+*/
+
+// Package wav provides functions for converting wav audio.
+package wav
+
+import (
+	"testing"
+)
+
+func TestWavWriter(t *testing.T) {
+	tests := []struct {
+		name    string
+		md Metadata
+		input []byte
+		wantN   int
+		wantErr error
+	}{
+		{name: "Header Only", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: nil, wantN: 44, wantErr: nil},
+		{name: "4 bytes", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 48, wantErr: nil},
+		{name: "No format", md: Metadata{Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidFormat},
+		{name: "Invalid format", md: Metadata{AudioFormat: 2, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidFormat},
+		{name: "No channels", md: Metadata{AudioFormat: PCMFormat, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidChannels},
+		{name: "Invalid channels", md: Metadata{AudioFormat: PCMFormat, Channels: 0, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidChannels},
+		{name: "No sample rate", md: Metadata{AudioFormat: PCMFormat, Channels: 1, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidRate},
+		{name: "Invalid sample rate", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 0, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidRate},
+		{name: "No bit depth", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidBitDepth},
+		{name: "Invalid bit depth", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 0}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidBitDepth},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			w := &WAV{
+				Metadata: tt.md,
+			}
+
+			gotN, err := w.Write(tt.input)
+			if err != tt.wantErr {
+				t.Errorf("WAV.Write() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			if gotN != tt.wantN {
+				t.Errorf("WAV.Write() = %v, want %v", gotN, tt.wantN)
+			}
+
+		})
+	}
+}