add basic test

idle/idle_test.go

@@ -6,6 +6,29 @@ import (
 )
 
 func TestIdlerChan(_ *testing.T) {
-	i := CreateIdler(1 * time.Second)
+	i := CreateIdler(10 * time.Millisecond)
 	<-i.Chan()
 }
+
+func TestGlobalIdler(t *testing.T) {
+	err := Wait(10 * time.Millisecond)
+	if err != nil {
+		t.Fatalf("idle.Wait failed, %v", err)
+	}
+	err = Wait(10 * time.Millisecond)
+	if err == nil {
+		t.Fatal("idle.Wait should fail when called second time")
+	}
+}
+
+func TestIdlerEnterExit(t *testing.T) {
+	i := CreateIdler(10 * time.Millisecond).(*idler)
+	i.Enter()
+	if i.active.Load() != 1 {
+		t.FailNow()
+	}
+	i.Exit()
+	if i.active.Load() != 0 {
+		t.FailNow()
+	}
+}