core: add test coverage for some of the wayland stack

- mostly targeting any race issue detection

core/internal/server/wlcontext/context_test.go

@@ -0,0 +1,127 @@
+package wlcontext
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSharedContext_ConcurrentPostNonBlocking(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 256),
+		stopChan: make(chan struct{}),
+	}
+
+	var wg sync.WaitGroup
+	const goroutines = 100
+	const iterations = 50
+
+	for i := 0; i < goroutines; i++ {
+		wg.Add(1)
+		go func(id int) {
+			defer wg.Done()
+			for j := 0; j < iterations; j++ {
+				sc.Post(func() {
+					_ = id + j
+				})
+			}
+		}(i)
+	}
+
+	wg.Wait()
+}
+
+func TestSharedContext_PostQueueFull(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 2),
+		stopChan: make(chan struct{}),
+	}
+
+	sc.Post(func() {})
+	sc.Post(func() {})
+	sc.Post(func() {})
+	sc.Post(func() {})
+
+	assert.Len(t, sc.cmdQueue, 2)
+}
+
+func TestSharedContext_StartMultipleTimes(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 256),
+		stopChan: make(chan struct{}),
+		started:  false,
+	}
+
+	var wg sync.WaitGroup
+	const goroutines = 10
+
+	for i := 0; i < goroutines; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			sc.Start()
+		}()
+	}
+
+	wg.Wait()
+
+	assert.True(t, sc.started)
+}
+
+func TestSharedContext_DrainCmdQueue(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 256),
+		stopChan: make(chan struct{}),
+	}
+
+	counter := 0
+	for i := 0; i < 10; i++ {
+		sc.cmdQueue <- func() {
+			counter++
+		}
+	}
+
+	sc.drainCmdQueue()
+
+	assert.Equal(t, 10, counter)
+	assert.Len(t, sc.cmdQueue, 0)
+}
+
+func TestSharedContext_DrainCmdQueueEmpty(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 256),
+		stopChan: make(chan struct{}),
+	}
+
+	sc.drainCmdQueue()
+
+	assert.Len(t, sc.cmdQueue, 0)
+}
+
+func TestSharedContext_ConcurrentDrainAndPost(t *testing.T) {
+	sc := &SharedContext{
+		cmdQueue: make(chan func(), 256),
+		stopChan: make(chan struct{}),
+	}
+
+	var wg sync.WaitGroup
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for i := 0; i < 100; i++ {
+			sc.Post(func() {})
+		}
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for i := 0; i < 50; i++ {
+			sc.drainCmdQueue()
+		}
+	}()
+
+	wg.Wait()
+}