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

core/internal/server/wlroutput/manager.go

@@ -9,7 +9,7 @@ import (
 	wlclient "github.com/AvengeMedia/DankMaterialShell/core/pkg/go-wayland/wayland/client"
 )
 
-func NewManager(display *wlclient.Display) (*Manager, error) {
+func NewManager(display wlclient.WaylandDisplay) (*Manager, error) {
 	m := &Manager{
 		display:    display,
 		ctx:        display.Context(),

core/internal/server/wlroutput/manager_test.go

@@ -1,11 +1,14 @@
 package wlroutput
 
 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) {
@@ -398,3 +401,14 @@ func TestStateChanged_IndexOutOfBounds(t *testing.T) {
 	b := &State{Serial: 1, Outputs: []Output{{Name: "eDP-1"}, {Name: "HDMI-A-1"}}}
 	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/wlroutput/types.go

@@ -45,7 +45,7 @@ type cmd struct {
 }
 
 type Manager struct {
-	display  *wlclient.Display
+	display  wlclient.WaylandDisplay
 	ctx      *wlclient.Context
 	registry *wlclient.Registry
 	manager  *wlr_output_management.ZwlrOutputManagerV1