diff --git a/src/convertmode/bytecolor2colorcode_test.go b/src/convertmode/bytecolor2colorcode_test.go
new file mode 100644
index 0000000..4bc9ecb
--- /dev/null
+++ b/src/convertmode/bytecolor2colorcode_test.go
@@ -0,0 +1,151 @@
+package convertmode
+
+import (
+	"github.com/brutella/can"
+	"reflect"
+	"testing"
+)
+
+func TestByteColor2ColorCode_String(t *testing.T) {
+	tests := []struct {
+		name string
+		want string
+	}{{"default", "bytecolor2colorcode"}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			by := ByteColor2ColorCode{}
+			if got := by.String(); got != tt.want {
+				t.Errorf("String() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestByteColor2ColorCode_ToCan(t *testing.T) {
+	type args struct {
+		input []byte
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    can.Frame
+		wantErr bool
+	}{
+		{
+			"empty input",
+			args{input: make([]byte, 0)},
+			can.Frame{},
+			true,
+		},
+		{
+			"regular",
+			args{input: []byte("#00ff00")},
+			can.Frame{Length: 3, Data: [8]uint8{0x0, 0xff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}},
+			false,
+		},
+		{
+			"mixed caps",
+			args{input: []byte("#AbFf0E")},
+			can.Frame{Length: 3, Data: [8]uint8{0xab, 0xff, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0}},
+			false,
+		},
+		{
+			"missing no sign",
+			args{input: []byte("AbFf0E")},
+			can.Frame{Length: 3, Data: [8]uint8{0xab, 0xff, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0}},
+			false,
+		},
+		{
+			"multiple no sign",
+			args{input: []byte("###AbFf0E")},
+			can.Frame{},
+			true,
+		},
+		{
+			"input too long",
+			args{input: []byte("#AAAAAAE")},
+			can.Frame{},
+			true,
+		},
+		{
+			"input too short",
+			args{input: []byte("#AAf0E")},
+			can.Frame{},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			by := ByteColor2ColorCode{}
+			got, err := by.ToCan(tt.args.input)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ToCan() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("ToCan() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestByteColor2ColorCode_ToMqtt(t *testing.T) {
+	type args struct {
+		input can.Frame
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    []byte
+		wantErr bool
+	}{
+		{
+			"good1",
+			args{can.Frame{Length: 3,
+				Data: [8]uint8{0x0, 0xff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}},
+			[]byte("#00ff00"),
+			false,
+		},
+		{
+			"good2",
+			args{can.Frame{Length: 3,
+				Data: [8]uint8{0xab, 0xff, 0x12, 0x0, 0x0, 0x0, 0x0, 0x0}}},
+			[]byte("#abff12"),
+			false,
+		},
+		{
+			"good3",
+			args{can.Frame{Length: 3,
+				Data: [8]uint8{0xab, 0xcd, 0xef, 0x0, 0x0, 0x0, 0x0, 0x0}}},
+			[]byte("#abcdef"),
+			false,
+		},
+		{
+			"frame too short",
+			args{can.Frame{Length: 2,
+				Data: [8]uint8{0xab, 0xcd, 0xef, 0x0, 0x0, 0x0, 0x0, 0x0}}},
+			[]byte{},
+			true,
+		},
+		{
+			"frame too long",
+			args{can.Frame{Length: 4,
+				Data: [8]uint8{0xab, 0xcd, 0xef, 0x0, 0x0, 0x0, 0x0, 0x0}}},
+			[]byte{},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			by := ByteColor2ColorCode{}
+			got, err := by.ToMqtt(tt.args.input)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ToMqtt() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("ToMqtt() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}