public void FlushVisitorAsyncTest()
{
var visitorCache = new Mock <IVisitorCacheImplementation>();
var visitorId = visitorDelegate.VisitorId;
visitorDelegate.Config.VisitorCacheImplementation = visitorCache.Object;
var defaultStrategy = new DefaultStrategy(visitorDelegate);
defaultStrategy.FlushVisitorAsync();
visitorCache.Verify(x => x.FlushVisitor(visitorId), Times.Once());
var error = new Exception("visitorCache error");
visitorCache.Setup(x => x.FlushVisitor(It.IsAny <string>())).Throws(error);
defaultStrategy.FlushVisitorAsync();
fsLogManagerMock.Verify(x => x.Error(error.Message, "FlushVisitor"), Times.Once());
}