core: mock wayland context for tests & add i18n guidance to CONTRIBUTING

core/internal/server/dwl/manager.go

@@ -10,7 +10,7 @@ import (
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/proto/dwl_ipc"
 )
 
-func NewManager(display *wlclient.Display) (*Manager, error) {
+func NewManager(display wlclient.WaylandDisplay) (*Manager, error) {
 	m := &Manager{
 		display:        display,
 		ctx:            display.Context(),

core/internal/server/dwl/manager_test.go

@@ -1,11 +1,14 @@
 package dwl
 
 import (
+	"errors"
 	"sync"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
+
+	mocks_wlclient "github.com/AvengeMedia/DankMaterialShell/core/internal/mocks/wlclient"
 )
 
 func TestStateChanged_BothNil(t *testing.T) {
@@ -350,3 +353,14 @@ func TestStateChanged_TagsLengthDiffers(t *testing.T) {
 	}
 	assert.True(t, stateChanged(a, b))
 }
+
+func TestNewManager_GetRegistryError(t *testing.T) {
+	mockDisplay := mocks_wlclient.NewMockWaylandDisplay(t)
+
+	mockDisplay.EXPECT().Context().Return(nil)
+	mockDisplay.EXPECT().GetRegistry().Return(nil, errors.New("failed to get registry"))
+
+	_, err := NewManager(mockDisplay)
+	assert.Error(t, err)
+	assert.Contains(t, err.Error(), "failed to get registry")
+}

core/internal/server/dwl/types.go

@@ -38,7 +38,7 @@ type cmd struct {
 }
 
 type Manager struct {
-	display  *wlclient.Display
+	display  wlclient.WaylandDisplay
 	ctx      *wlclient.Context
 	registry *wlclient.Registry
 	manager  any