From 9544a130abfba13a5eb8a6a5ac7788e6d3b29ad6 Mon Sep 17 00:00:00 2001
From: Matias Lahti <matias@mixin.fi>
Date: Mon, 2 Nov 2020 16:36:54 +0200
Subject: [PATCH] feat(song): add basic JSON marshaling/unmarshaling tests to
 make sure everything gets marshalled properly

TBD: should the various []bytes be marshaled in a different way? Go defaults to base64-encoded strings but creating just plain JSON arrays with bytes could be more friendly to both humans and computers.
---
 go4k/song_json_test.go | 51 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 go4k/song_json_test.go

diff --git a/go4k/song_json_test.go b/go4k/song_json_test.go
new file mode 100644
index 0000000..80217d3
--- /dev/null
+++ b/go4k/song_json_test.go
@@ -0,0 +1,51 @@
+package go4k_test
+
+import (
+	"encoding/json"
+	"github.com/vsariola/sointu/go4k"
+	"reflect"
+	"testing"
+)
+
+const expectedMarshaled = "{\"BPM\":100,\"Patterns\":[\"QABEACAAAABLAE4AAAAAAA==\"],\"Tracks\":[{\"NumVoices\":1,\"Sequence\":\"AA==\"}],\"SongLength\":0,\"Patch\":[{\"NumVoices\":1,\"Units\":[{\"Type\":\"envelope\",\"Stereo\":false,\"Parameters\":{\"attack\":32,\"decay\":32,\"gain\":128,\"release\":64,\"sustain\":64}},{\"Type\":\"oscillator\",\"Stereo\":false,\"Parameters\":{\"color\":96,\"detune\":64,\"flags\":64,\"gain\":128,\"phase\":0,\"shape\":64,\"transpose\":64}},{\"Type\":\"mulp\",\"Stereo\":false,\"Parameters\":{}},{\"Type\":\"envelope\",\"Stereo\":false,\"Parameters\":{\"attack\":32,\"decay\":32,\"gain\":128,\"release\":64,\"sustain\":64}},{\"Type\":\"oscillator\",\"Stereo\":false,\"Parameters\":{\"color\":64,\"detune\":64,\"flags\":64,\"gain\":128,\"phase\":64,\"shape\":96,\"transpose\":72}},{\"Type\":\"mulp\",\"Stereo\":false,\"Parameters\":{}},{\"Type\":\"out\",\"Stereo\":true,\"Parameters\":{\"gain\":128}}]}]}"
+
+var testSong = go4k.Song{
+	BPM:      100,
+	Patterns: [][]byte{{64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0, 0, 0}},
+	Tracks: []go4k.Track{
+		{NumVoices: 1, Sequence: []byte{0}},
+	},
+	SongLength: 0,
+	Patch: go4k.Patch{
+		go4k.Instrument{NumVoices: 1, Units: []go4k.Unit{
+			{"envelope", false, map[string]int{"attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
+			{"oscillator", false, map[string]int{"transpose": 64, "detune": 64, "phase": 0, "color": 96, "shape": 64, "gain": 128, "flags": 0x40}},
+			{"mulp", false, map[string]int{}},
+			{"envelope", false, map[string]int{"attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
+			{"oscillator", false, map[string]int{"transpose": 72, "detune": 64, "phase": 64, "color": 64, "shape": 96, "gain": 128, "flags": 0x40}},
+			{"mulp", false, map[string]int{}},
+			{"out", true, map[string]int{"gain": 128}},
+		}},
+	},
+}
+
+func TestSongMarshalJSON(t *testing.T) {
+	songbytes, err := json.Marshal(testSong)
+	if err != nil {
+		t.Fatalf("cannot marshal song: %v", err)
+	}
+	if string(songbytes) != expectedMarshaled {
+		t.Fatalf("expectedMarshaled song to unexpected result, got %v, expected %v", string(songbytes), expectedMarshaled)
+	}
+}
+
+func TestSongUnmarshalJSON(t *testing.T) {
+	var song go4k.Song
+	err := json.Unmarshal([]byte(expectedMarshaled), &song)
+	if err != nil {
+		t.Fatalf("cannot unmarshal song: %v", err)
+	}
+	if !reflect.DeepEqual(song, testSong) {
+		t.Fatalf("unmarshaled song to unexpected result, got %#v, expected  %#v", song, testSong)
+	}
+}