add tests for midi.message.decode

internal/processor/test/midi-message-decode_test.go

@@ -1,10 +1,12 @@
 package processor_test
 
 import (
+	"reflect"
 	"testing"
 
 	"github.com/jwetzell/showbridge-go/internal/config"
 	"github.com/jwetzell/showbridge-go/internal/processor"
+	"gitlab.com/gomidi/midi/v2"
 )
 
 func TestMIDIMessageDecodeFromRegistry(t *testing.T) {
@@ -25,3 +27,66 @@ func TestMIDIMessageDecodeFromRegistry(t *testing.T) {
 		t.Fatalf("midi.message.decode processor has wrong type: %s", processorInstance.Type())
 	}
 }
+
+func TestGoodMIDIMessageDecode(t *testing.T) {
+	processorInstance := &processor.MIDIMessageDecode{}
+	tests := []struct {
+		name     string
+		payload  any
+		expected any
+	}{
+		{
+			name:     "note on message",
+			payload:  []byte{0x90, 0x40, 0x7F},
+			expected: midi.NoteOn(0, 64, 127),
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got, err := processorInstance.Process(t.Context(), test.payload)
+			if err != nil {
+				t.Fatalf("midi.message.decode failed: %s", err)
+			}
+
+			gotMessage, ok := got.(midi.Message)
+			if !ok {
+				t.Fatalf("midi.message.decode returned a %T payload: %s", got, got)
+			}
+
+			if !reflect.DeepEqual(gotMessage, test.expected) {
+				t.Fatalf("midi.message.decode got %+v, expected %+v", gotMessage, test.expected)
+			}
+		})
+	}
+}
+
+func TestBadMIDIMessageDecode(t *testing.T) {
+	processorInstance := &processor.MIDIMessageDecode{}
+	tests := []struct {
+		name        string
+		payload     any
+		errorString string
+	}{
+		{
+			name:        "non-byte slice payload",
+			payload:     "12345",
+			errorString: "midi.message.decode processor only accepts a []byte",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+
+			got, err := processorInstance.Process(t.Context(), test.payload)
+
+			if err == nil {
+				t.Fatalf("midi.message.decode expected to fail but succeeded, got: %v", got)
+
+			}
+			if err.Error() != test.errorString {
+				t.Fatalf("midi.message.decode got error '%s', expected '%s'", err.Error(), test.errorString)
+			}
+		})
+	}
+}