[#403] Align runmode.Retro() with latest version of runmode interface

- Add implementation for IsMultiRole() in retro.go
- Add retro_test.go for verifying Retro behavior

src/runmode/retro.go

@@ -36,6 +36,11 @@ func (Retro) AutoPushDefault() bool {
 	return false
 }
 
+// IsMultiRole indicates if this run mode supports multiple roles
+func (r Retro) IsMultiRole() bool {
+	return false
+}
+
 // NeedsCountdownTimer indicates if a countdown timer is needed with this run mode
 func (Retro) NeedsCountdownTimer() bool {
 	return false

src/runmode/retro_test.go

@@ -0,0 +1,48 @@
+/*
+Copyright (c) 2024 Murex
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+package runmode
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func Test_retro_mode_name(t *testing.T) {
+	assert.Equal(t, "retro", Retro{}.Name())
+}
+
+func Test_retro_mode_default_auto_push_if_false(t *testing.T) {
+	assert.False(t, Retro{}.AutoPushDefault())
+}
+
+func Test_retro_mode_does_not_require_multiple_roles(t *testing.T) {
+	assert.False(t, Retro{}.IsMultiRole())
+}
+
+func Test_retro_mode_allows_user_interactions(t *testing.T) {
+	assert.False(t, Retro{}.IsInteractive())
+}
+
+func Test_retro_mode_is_an_active_mode(t *testing.T) {
+	assert.False(t, Retro{}.IsActive())
+}