[🤖] Add Unit-Tests

dataext/casMutex_test.go

@@ -0,0 +1,122 @@
+package dataext
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestCASMutex_LockUnlock(t *testing.T) {
+	m := NewCASMutex()
+	m.Lock()
+	m.Unlock()
+}
+
+func TestCASMutex_TryLock(t *testing.T) {
+	m := NewCASMutex()
+	if !m.TryLock() {
+		t.Fatal("TryLock should succeed on fresh mutex")
+	}
+	if m.TryLock() {
+		t.Fatal("TryLock should fail when already locked")
+	}
+	m.Unlock()
+	if !m.TryLock() {
+		t.Fatal("TryLock should succeed after Unlock")
+	}
+	m.Unlock()
+}
+
+func TestCASMutex_TryLockWithTimeout(t *testing.T) {
+	m := NewCASMutex()
+	m.Lock()
+	start := time.Now()
+	if m.TryLockWithTimeout(20 * time.Millisecond) {
+		t.Fatal("TryLockWithTimeout should fail when locked")
+	}
+	if time.Since(start) < 15*time.Millisecond {
+		t.Fatal("TryLockWithTimeout returned too quickly")
+	}
+	m.Unlock()
+
+	if !m.TryLockWithTimeout(50 * time.Millisecond) {
+		t.Fatal("TryLockWithTimeout should succeed when unlocked")
+	}
+	m.Unlock()
+}
+
+func TestCASMutex_TryLockWithContext_Cancel(t *testing.T) {
+	m := NewCASMutex()
+	m.Lock()
+	defer m.Unlock()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		cancel()
+	}()
+	if m.TryLockWithContext(ctx) {
+		t.Fatal("expected lock to fail after cancel")
+	}
+}
+
+func TestCASMutex_RLockMultiple(t *testing.T) {
+	m := NewCASMutex()
+	if !m.RTryLock() {
+		t.Fatal("RTryLock should succeed")
+	}
+	if !m.RTryLock() {
+		t.Fatal("Second RTryLock should succeed")
+	}
+	if m.TryLock() {
+		t.Fatal("Write TryLock should fail with read locks held")
+	}
+	m.RUnlock()
+	m.RUnlock()
+	if !m.TryLock() {
+		t.Fatal("Write TryLock should succeed after read unlocks")
+	}
+	m.Unlock()
+}
+
+func TestCASMutex_RLocker(t *testing.T) {
+	m := NewCASMutex()
+	rl := m.RLocker()
+	rl.Lock()
+	rl.Unlock()
+}
+
+func TestCASMutex_Concurrent(t *testing.T) {
+	m := NewCASMutex()
+	var counter int64
+	const n = 50
+	var wg sync.WaitGroup
+	wg.Add(n)
+	for i := 0; i < n; i++ {
+		go func() {
+			defer wg.Done()
+			m.Lock()
+			atomic.AddInt64(&counter, 1)
+			m.Unlock()
+		}()
+	}
+	wg.Wait()
+	if atomic.LoadInt64(&counter) != n {
+		t.Fatalf("counter=%d want %d", counter, n)
+	}
+}
+
+func TestCASMutex_RTryLockWithTimeout(t *testing.T) {
+	m := NewCASMutex()
+	m.Lock()
+	if m.RTryLockWithTimeout(20 * time.Millisecond) {
+		t.Fatal("RTryLockWithTimeout should fail when write-locked")
+	}
+	m.Unlock()
+	if !m.RTryLockWithTimeout(20 * time.Millisecond) {
+		t.Fatal("RTryLockWithTimeout should succeed when free")
+	}
+	m.RUnlock()
+}